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Robustness via Uncertainty-aware Cycle Consistency [article]

Uddeshya Upadhyay, Yanbei Chen, Zeynep Akata
<span title="2021-10-24">2021</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Unpaired image-to-image translation refers to learning inter-image-domain mapping without corresponding image pairs. Existing methods learn deterministic mappings without explicitly modelling the robustness to outliers or predictive uncertainty, leading to performance degradation when encountering unseen perturbations at test time. To address this, we propose a novel probabilistic method based on Uncertainty-aware Generalized Adaptive Cycle Consistency (UGAC), which models the per-pixel
more &raquo; ... by generalized Gaussian distribution, capable of modelling heavy-tailed distributions. We compare our model with a wide variety of state-of-the-art methods on various challenging tasks including unpaired image translation of natural images, using standard datasets, spanning autonomous driving, maps, facades, and also in medical imaging domain consisting of MRI. Experimental results demonstrate that our method exhibits stronger robustness towards unseen perturbations in test data. Code is released here: https://github.com/ExplainableML/UncertaintyAwareCycleConsistency.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2110.12467v1">arXiv:2110.12467v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/owggkflpu5c25mxqy4qxhlqwyu">fatcat:owggkflpu5c25mxqy4qxhlqwyu</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20211030215724/https://arxiv.org/pdf/2110.12467v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/06/ff/06ff6e7d64d74a42cde8edea3ecf3f30ff36579e.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2110.12467v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Quantum expander for gravitational-wave observatories [article]

Mikhail Korobko, Yiqiu Ma, Yanbei Chen, Roman Schnabel
<span title="2019-03-14">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Quantum uncertainty of laser light limits the sensitivity of gravitational-wave observatories. In the past 30 years, techniques for squeezing the quantum uncertainty as well as for enhancing the gravitational-wave signal with optical resonators were invented. Resonators, however, have finite linewidths; and the high signal frequencies that are produced during the scientifically highly interesting ring-down of astrophysical compact-binary mergers cannot be resolved today. Here, we propose an
more &raquo; ... cal approach for expanding the detection bandwidth. It uses quantum uncertainty squeezing inside one of the optical resonators, compensating for finite resonators' linewidths while maintaining the low-frequency sensitivity unchanged. Introducing the quantum expander for boosting the sensitivity of future gravitational-wave detectors, we envision it to become a new tool in other cavity-enhanced metrological experiments.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1903.05930v1">arXiv:1903.05930v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/6g6be4h2ofcwbp3fnancwowlxq">fatcat:6g6be4h2ofcwbp3fnancwowlxq</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200825122441/https://arxiv.org/pdf/1903.05930v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/ce/a3/cea3b74146ba10b482201735fd03ef9e7b3f76ff.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1903.05930v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Universally Valid Error-Disturbance Relations in Continuous Measurements [article]

Atsushi Nishizawa, Yanbei Chen
<span title="2015-05-31">2015</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Chen, D 65, 022002 (2002), arXiv:gr-qc/0008026 [gr-qc].  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1506.00304v1">arXiv:1506.00304v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/fpbbrksk75dypd4tsbw2u3sew4">fatcat:fpbbrksk75dypd4tsbw2u3sew4</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200831142427/https://arxiv.org/pdf/1506.00304v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/e4/0a/e40a0f6770f11b02d7160b251a5c0c9ea7a70834.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1506.00304v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Deep Association Learning for Unsupervised Video Person Re-identification [article]

Yanbei Chen, Xiatian Zhu, Shaogang Gong
<span title="2018-08-22">2018</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Deep learning methods have started to dominate the research progress of video-based person re-identification (re-id). However, existing methods mostly consider supervised learning, which requires exhaustive manual efforts for labelling cross-view pairwise data. Therefore, they severely lack scalability and practicality in real-world video surveillance applications. In this work, to address the video person re-id task, we formulate a novel Deep Association Learning (DAL) scheme, the first
more &raquo; ... end deep learning method using none of the identity labels in model initialisation and training. DAL learns a deep re-id matching model by jointly optimising two margin-based association losses in an end-to-end manner, which effectively constrains the association of each frame to the best-matched intra-camera representation and cross-camera representation. Existing standard CNNs can be readily employed within our DAL scheme. Experiment results demonstrate that our proposed DAL significantly outperforms current state-of-the-art unsupervised video person re-id methods on three benchmarks: PRID 2011, iLIDS-VID and MARS.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1808.07301v1">arXiv:1808.07301v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/cywf42drlnhkhcfkgora7fdkha">fatcat:cywf42drlnhkhcfkgora7fdkha</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20191014194813/https://arxiv.org/pdf/1808.07301v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/8b/85/8b85a8f41244dbc414400dc5816c806fa184046e.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1808.07301v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Quantum-state steering in optomechanical devices [article]

Helge Mueller-Ebhardt and Haixing Miao and Stefan Danilishin and Yanbei Chen
<span title="2012-11-19">2012</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We show that optomechanical systems in the quantum regime can be used to demonstrate EPR-type quantum entanglement between the optical field and the mechanical oscillator, via quantum-state steering. Namely, the conditional quantum state of the mechanical oscillator can be steered into different quantum states depending the choice made on which quadrature of the out-going field is to be measured via homodyne detection. More specifically, if quantum radiation pressure force dominates over
more &raquo; ... force, the oscillator's quantum state is steerable with a photodetection efficiency as low as 50 the ideal limit shown by Wiseman and Gambetta [Phys. Rev. Lett. 108, 220402 (2012)]. We also show that requirement for steerability is the same as those for achieving sub-Heisenberg state tomography using the same experimental setup.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1211.4315v1">arXiv:1211.4315v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/ny3atykvtbcifmemi6uxs6sy4a">fatcat:ny3atykvtbcifmemi6uxs6sy4a</a> </span>
<a target="_blank" rel="noopener" href="https://archive.org/download/arxiv-1211.4315/1211.4315.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> File Archive [PDF] </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1211.4315v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Instability of exotic compact objects and its implications for gravitational-wave echoes [article]

Baoyi Chen, Yanbei Chen, Yiqiu Ma, Ka-Lok R. Lo, Ling Sun
<span title="2019-02-21">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Exotic compact objects (ECOs) have recently become an exciting research subject, since they are speculated to have a special response to the incident gravitational waves (GWs) that leads to GW echoes. We show that energy carried by GWs can easily cause the event horizon to form out of a static ECO --- leaving no echo signals towards spatial infinity. To show this, we use the ingoing Vaidya spacetime and take into account the back reaction due to incoming GWs. Demanding that an ECO does not
more &raquo; ... pse into a black hole puts an upper bound on the compactness of the ECO, at the cost of less distinct echo signals for smaller compactness. The trade-off between echoes' detectability and distinguishability leads to a fine tuning of ECO parameters for LIGO to find distinct echoes. We also show that an extremely compact ECO that can survive the gravitational collapse and give rise to GW echoes might have to expand its surface in a non-causal way.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1902.08180v1">arXiv:1902.08180v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/26gjsz6sjnes3e2vcni7v57i7i">fatcat:26gjsz6sjnes3e2vcni7v57i7i</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200826214436/https://arxiv.org/pdf/1902.08180v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/50/e6/50e6cfd742db3f1e464821532a580d612db9e228.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1902.08180v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Reveal non-Markovianity of open quantum systems via local operations [article]

Huan Yang, Haixing Miao, Yanbei Chen
<span title="2011-11-25">2011</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Non-Markovianity, as an important feature of general open quantum systems, is usually difficult to quantify with limited knowledge of how the plant that we are interested in interacts with its environment-the bath. It often happens that the reduced dynamics of the plant attached to a non-Markovian bath becomes indistinguishable from the one with a Markovian bath, if we left the entire system freely evolve. Here we show that non-Markovianity can be revealed via applying local unitary operations
more &raquo; ... n the plant-they will influence the plant evolution at later times due to memory of the bath. This not only provides a new criterion for non-Markovianity, but also sheds light on protecting and recovering quantum coherence in non-Markovian systems, which will be useful for quantum-information processing.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1111.6079v1">arXiv:1111.6079v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/hf3hrffqjfdabial7etkug46xm">fatcat:hf3hrffqjfdabial7etkug46xm</a> </span>
<a target="_blank" rel="noopener" href="https://archive.org/download/arxiv-1111.6079/1111.6079.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> File Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/c0/64/c06462408af317be6c98c5080b9b18ffb350af79.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1111.6079v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Semi-supervised Deep Learning with Memory [chapter]

Yanbei Chen, Xiatian Zhu, Shaogang Gong
<span title="">2018</span> <i title="Springer International Publishing"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/2w3awgokqne6te4nvlofavy5a4" style="color: black;">Lecture Notes in Computer Science</a> </i> &nbsp;
., Chen, X.: Improved techniques for training gans. In: Advances in Neural Information Processing Systems (2016) 28.  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/978-3-030-01246-5_17">doi:10.1007/978-3-030-01246-5_17</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/xxd7ckagrfhtjdyvveqf4fabiu">fatcat:xxd7ckagrfhtjdyvveqf4fabiu</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20190429232659/https://qmro.qmul.ac.uk/xmlui/bitstream/handle/123456789/49609/Gong%20Semi-supervised%20Deep%202018%20Accepted.pdf;jsessionid=5AF3C966061E343E240475CEA0A1955D?sequence=1" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/a5/77/a577285e59adb772913140dd0a8bcce8a258b3dc.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1007/978-3-030-01246-5_17"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="external alternate icon"></i> springer.com </button> </a>

Where and When: Space-Time Attention for Audio-Visual Explanations [article]

Yanbei Chen, Thomas Hummel, A. Sophia Koepke, Zeynep Akata
<span title="2021-05-04">2021</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Explaining the decision of a multi-modal decision-maker requires to determine the evidence from both modalities. Recent advances in XAI provide explanations for models trained on still images. However, when it comes to modeling multiple sensory modalities in a dynamic world, it remains underexplored how to demystify the mysterious dynamics of a complex multi-modal model. In this work, we take a crucial step forward and explore learnable explanations for audio-visual recognition. Specifically,
more &raquo; ... propose a novel space-time attention network that uncovers the synergistic dynamics of audio and visual data over both space and time. Our model is capable of predicting the audio-visual video events, while justifying its decision by localizing where the relevant visual cues appear, and when the predicted sounds occur in videos. We benchmark our model on three audio-visual video event datasets, comparing extensively to multiple recent multi-modal representation learners and intrinsic explanation models. Experimental results demonstrate the clear superior performance of our model over the existing methods on audio-visual video event recognition. Moreover, we conduct an in-depth study to analyze the explainability of our model based on robustness analysis via perturbation tests and pointing games using human annotations.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2105.01517v1">arXiv:2105.01517v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/4avh3zn6xvcutihresexrnjrke">fatcat:4avh3zn6xvcutihresexrnjrke</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20210506055824/https://arxiv.org/pdf/2105.01517v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/5a/ac/5aacd927da1cffe33b1ccf71ffd8bc3d553b90b6.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2105.01517v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Attention Consistency on Visual Corruptions for Single-Source Domain Generalization [article]

Ilke Cugu, Massimiliano Mancini, Yanbei Chen, Zeynep Akata
<span title="2022-04-27">2022</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Attention Consistency on Visual Corruptions for Single-Source Domain Generalization (Supplementary Material) Ilke Cugu 1 , Massimiliano Mancini 1 , Yanbei Chen 1 , Zeynep Akata 1,2 1 University of Tübingen  ... 
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2204.13091v1">arXiv:2204.13091v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/bbb4ujyuiraztencyixitwbkem">fatcat:bbb4ujyuiraztencyixitwbkem</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20220502225850/https://arxiv.org/pdf/2204.13091v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/99/b9/99b950ccae11a639c674d25ca06b2fdaf4bd919b.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2204.13091v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Fundamental Relations between Measurement, Radiation and Decoherence in Gravitational Wave Laser Interferometer Detectors [article]

Belinda Pang, Yanbei Chen
<span title="2019-03-22">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
As laser interferometer gravitational wave (GW) detectors become quantum noise dominated, understanding the fundamental limit on measurement sensitivity imposed by quantum uncertainty is crucial to guide the search for further noise reduction. Recent efforts have included applying ideas from quantum information theory to GW detection -- specifically the quantum Cramer Rao bound, which is a minimum bound on error in parameter estimation using a quantum state and is determined by the state's
more &raquo; ... um Fisher information (QFI) with respect to the parameter. Identifying the QFI requires knowing the interaction between the quantum measurement device and the signal, which was rigorously derived for GW interferometer detectors in [Phys. Rev. D 98, 124006]. In this paper, we calculate the QFI and fundamental quantum limit (FQL) for GW detection, and furthermore derive explicit reciprocity relations involving the QFI which summarize information exchange between the detector and a surrounding weak quantum GW field. Specifically, we show that the GW power radiation by the detector's quantum fluctuations are proportional to the QFI, and therefore inversely proportional to its FQL. Similarly, the detector's decoherence rate in a white noise GW bath can be explicitly related to the QFI/FQL. These relations are fundamental and appear generalizable to a broader class of quantum measurement systems.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1903.09378v1">arXiv:1903.09378v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/ok7wlrwuxrhufnzko64tbxyx2m">fatcat:ok7wlrwuxrhufnzko64tbxyx2m</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200831013439/https://arxiv.org/pdf/1903.09378v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/65/1f/651f4f043a8469173533390a84b5aac536ca2c88.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1903.09378v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Constraints on low-energy effective theories from weak cosmic censorship [article]

Baoyi Chen, Feng-Li Lin, Bo Ning, Yanbei Chen
<span title="2020-06-15">2020</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We examine the weak cosmic censorship conjecture (WCCC) for the extremal charged black hole in the possible generalizations of the Einstein-Maxwell theory due to the fourth-derivative higher order corrections. Our derivation is based on Wald's gedanken experiment to destroy an extremal black hole. We find that WCCC no longer holds for all the possible generalizations. Thus, WCCC can serve as an additional constraint to the swampland conjecture. However, our constraint is independent of photon's
more &raquo; ... self-interactions so that the precision measurement of quantum electrodynamics cannot constrain WCCC. For the higher-dimension operators induced by the one-loop correction for the minimally coupled spinor and scalar to gravity, our constraint is satisfied.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2006.08663v1">arXiv:2006.08663v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/kigafwrhivfbnlq7yqun6qz6um">fatcat:kigafwrhivfbnlq7yqun6qz6um</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200618002005/https://arxiv.org/pdf/2006.08663v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/2006.08663v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Application of optomechanical frequency conversion on gravitational wave detection [article]

Yiqiu Ma, Feng-Li Lin, Haixing Miao, Chunnong Zhao, Yanbei Chen
<span title="2019-12-03">2019</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
Optomechanical interaction can be a platform for converting quantum optical sates at different frequencies. In this work, we propose to combine the idea of optomechanical frequency conversion and the dual-use of laser interferometer, for the purpose of improving the broadband sensitivity of laser interferometer gravitational wave detectors by filtering the light field. We found that compare to the previous schemes of implementing the optomechanical devices in gravitational wave detectors, this
more &raquo; ... requency converter scheme will have less stringent requirement on the thermal noise dilution.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1912.01246v1">arXiv:1912.01246v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/6tqkocusondzbb6c235srjmf3e">fatcat:6tqkocusondzbb6c235srjmf3e</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20200922213836/https://arxiv.org/pdf/1912.01246v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/2b/f4/2bf4b625349c7054a0168c54372ace0bee384108.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1912.01246v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>

Quantum expander for gravitational-wave observatories

Mikhail Korobko, Yiqiu Ma, Yanbei Chen, Roman Schnabel
<span title="2019-12-11">2019</span> <i title="Springer Science and Business Media LLC"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/y5icnkvcrncrdfvhmtw3bdbma4" style="color: black;">Light: Science &amp; Applications</a> </i> &nbsp;
The quantum uncertainty of laser light limits the sensitivity of gravitational-wave observatories. Over the past 30 years, techniques for squeezing the quantum uncertainty, as well as for enhancing gravitational-wave signals with optical resonators have been invented. Resonators, however, have finite linewidths, and the high signal frequencies that are produced during the highly scientifically interesting ring-down of astrophysical compact-binary mergers still cannot be resolved. Here, we
more &raquo; ... e a purely optical approach for expanding the detection bandwidth. It uses quantum uncertainty squeezing inside one of the optical resonators, compensating for the finite resonators' linewidths while keeping the low-frequency sensitivity unchanged. This quantum expander is intended to enhance the sensitivity of future gravitational-wave detectors, and we suggest the use of this new tool in other cavity-enhanced metrological experiments.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1038/s41377-019-0230-2">doi:10.1038/s41377-019-0230-2</a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pubmed/31839938">pmid:31839938</a> <a target="_blank" rel="external noopener" href="https://pubmed.ncbi.nlm.nih.gov/PMC6904558/">pmcid:PMC6904558</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/wmvzz2wd6bczpcb36wxnqqwhaq">fatcat:wmvzz2wd6bczpcb36wxnqqwhaq</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20191212011604/https://www.nature.com/articles/s41377-019-0230-2.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/5d/f0/5df025e19c683667307d7dba93912a8abe74713e.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1038/s41377-019-0230-2"> <button class="ui left aligned compact blue labeled icon button serp-button"> <i class="unlock alternate icon" style="background-color: #fb971f;"></i> Publisher / doi.org </button> </a> <a target="_blank" rel="external noopener" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6904558" title="pubmed link"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> pubmed.gov </button> </a>

Quantum back action cancellation in the audio band [article]

Jonathan Cripe, Torrey Cullen, Yanbei Chen, Paula Heu, David Follman, Garrett D. Cole, Thomas Corbitt
<span title="2018-12-25">2018</span> <i > arXiv </i> &nbsp; <span class="release-stage" >pre-print</span>
We report on the cancellation of quantum back action noise in an optomechanical cavity. We perform two measurements of the displacement of the microresonator, one in reflection of the cavity, and one in transmission of the cavity. We show that measuring the amplitude quadrature of the light in transmission of the optomechanical cavity allows us to cancel the back action noise between 1 kHz and 50 kHz, and obtain a more sensitive measurement of the microresonator's position. To confirm that the
more &raquo; ... ack action is eliminated, we measure the noise in the transmission signal as a function of circulating power. By splitting the transmitted light onto two photodetectors and cross correlating the two signals, we remove the contributon from shot noise and measure a quantum noise free thermal noise spectrum. Eliminating the effects of back action in this frequency regime is an important demonstration of a technique that could be used to mitigate the effects of back action in interferometric gravitational wave detectors such as Advanced LIGO.
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1812.10028v1">arXiv:1812.10028v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/3js4zbo2mbes5bmxakmvgrlomu">fatcat:3js4zbo2mbes5bmxakmvgrlomu</a> </span>
<a target="_blank" rel="noopener" href="https://web.archive.org/web/20191025080056/https://arxiv.org/pdf/1812.10028v1.pdf" title="fulltext PDF download" data-goatcounter-click="serp-fulltext" data-goatcounter-title="serp-fulltext"> <button class="ui simple right pointing dropdown compact black labeled icon button serp-button"> <i class="icon ia-icon"></i> Web Archive [PDF] <div class="menu fulltext-thumbnail"> <img src="https://blobs.fatcat.wiki/thumbnail/pdf/f2/16/f2164a0003632b9f214aa95220c9380de1df488a.180px.jpg" alt="fulltext thumbnail" loading="lazy"> </div> </button> </a> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/1812.10028v1" title="arxiv.org access"> <button class="ui compact blue labeled icon button serp-button"> <i class="file alternate outline icon"></i> arxiv.org </button> </a>
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