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Quantum coherent feedback control with photons
[article]
2022
arXiv
pre-print
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The purpose of this paper is to study two-photon dynamics induced by the coherent feedback control of a cavity quantum electrodynamics (cavity QED) system coupled to a waveguide with a terminal mirror. In this set-up, the two-level system in the cavity can work as a photon source, and the photon emitted into the waveguide can re-interact with the cavity-QED system many times after perfectly reflected by the terminal mirror of the waveguide, during which the feedback can tune the number of the
arXiv:2206.01445v1
fatcat:xkpcvkyguncvjiurzet47ne4jm
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... otons in the waveguide and cavity. We analyze the dynamics of two-photon processes in this coherent feedback network in two scenarios: the continuous mode coupling scheme and the discrete periodic mode coupling scheme between the waveguide and cavity. The difference of these coupling schemes is due to the transmission of fields between the waveguide and cavity, and the their relative scales. Specifically, in the continuous mode coupling scheme, the generation of two-photon states is influenced by the length of the feedback loop of the waveguide and the coupling strength between the waveguide and the cavity QED system. By tuning the length of the waveguide and the coupling strength, we are able to generate two-photon states efficiently. In the discrete periodic mode coupling scheme, the Rabi oscillation in the cavity can be stabilized and there are no notable two-photon states in the waveguide.
An Improved Quantum Projection Filter
[article]
2019
arXiv
pre-print
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., Zhang G., Petersen I. R. (2019). An exponential quantum projection filter for open quantum systems. Automatica, 99, 59-68.], by adding an optimality analysis result. ...
arXiv:1909.13524v1
fatcat:ihfn664jlvco7jnhr7xvh3vpwu
Quantum Criticality in the Biased Dicke Model
[article]
2015
arXiv
pre-print
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The biased Dicke model describes a system of biased two-level atoms coupled to a bosonic field, and is expected to produce new phenomena that are not present in the original Dicke model. In this paper, we study the critical properties of the biased Dicke model in the classical oscillator limits. For the finite-biased case in this limit, We present analytical results demonstrating that the excitation energy does not vanish for arbitrary coupling. This indicates that the second order phase
arXiv:1512.06531v1
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... ion is avoided in the biased Dicke model, which contrasts to the original Dicke model. We also analyze the squeezing and the entanglement in the ground state, and find that a finite bias will strongly modify their behaviors in the vicinity of the critical coupling point.
TRIM proteins in neuroblastoma
2019
Bioscience Reports
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Neuroblastoma (NB) is the most common extracranial solid tumor in childhood. Outcome for children with high-risk NB remains unsatisfactory. Accumulating evidence suggests that tripartite motif (TRIM) family proteins express diversely in various human cancers and act as regulators of oncoproteins or tumor suppressor proteins. This review summarizes the TRIM proteins involving in NB and the underlying molecular mechanisms. We expect these new insights will provide important implications for the treatment of NB by targeting TRIM proteins.
doi:10.1042/bsr20192050
pmid:31820796
pmcid:PMC6928532
fatcat:njfkw6kfgjhvhniz36ftyd4drm
Single-photon quantum filtering with multiple measurements
[article]
2018
arXiv
pre-print
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The single-photon quantum filtering problems have been investigated recently with applications in quantum computing. In practice, the detector responds with a quantum efficiency of less than unity since there exists some mode mismatch between the detector and the system, and the single-photon signal may be corrupted by quantum white noise. Consequently, quantum filters based on multiple measurements are designed in this paper to improve the estimation performance. More specifically, the
arXiv:1801.03267v1
fatcat:xxtuuw77s5gqfdeaviy6meosfi
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... g equations for a two-level quantum system driven by a single-photon input state and under multiple measurements are presented in this paper. Four scenarios, 1) two diffusive measurements with Q-P quadrature form, 2) two diffusive measurements with Q-Q quadrature form, 3) diffusive plus Poissonian measurements, and 4) two Poissonian measurements, are considered. It is natural to compare the filtering results, i.e., measuring single channel or both channels, which one is better? By the simulation where we use a single photon to excite an atom, it seems that multiple measurements enable us to excite the atom with higher probability than only measuring single channel. In addition, measurement back-action phenomenon is revealed by the simulation results.
Linear quantum systems: a tutorial
[article]
2022
arXiv
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The purpose of this tutorial is to give a brief introduction to linear quantum control systems. The mathematical model of linear quantum control systems is presented first, then some fundamental control-theoretic notions such as stability, controllability and observability are given, which are closely related to several important concepts in quantum information science such as decoherence-free subsystems, quantum non-demolition variables, and back-action evasion measurements. After that,
arXiv:2205.04080v2
fatcat:76tlnuqhvjaspmtczbzdovx5ye
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... Gaussian states are introduced, in particular, an information-theoretic uncertainty relation is presented which often gives a better bound for mixed Gaussian states than the well-known Heisenberg uncertainty relation. The quantum Kalman filter is presented for quantum linear systems, which is the quantum analogy of the Kalman filter for classical (namely, non-quantum-mechanical) linear systems. The quantum Kalman canonical decomposition for quantum linear systems is recorded, and its application is illustrated by means of a recent experiment. As single- and multi-photon states are useful resources in quantum information technology, the response of quantum linear systems to these types of input is presented. Finally, coherent feedback control of quantum linear systems is briefly introduced, and a recent experiment is used to demonstrate the effectiveness of quantum linear systems and networks theory.dback control of quantum linear systems is briefly introduced, and a recent experiment is used to demonstrate the effectiveness of quantum linear systems and networks theory.
On the Control of Flying Qubits
[article]
2021
arXiv
pre-print
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The control of flying quantum bits (qubits) carried by traveling quantum fields is crucial for coherent information transmission in quantum networks. In this paper, we develop a general framework for modeling the generation, catching and transformation processes of flying qubits. We introduce the quantum stochastic differential equation (QSDE) to describe the flying-qubit input-output relations actuated by a standing quantum system. Under the continuous time-ordered photon-number basis, the
arXiv:2111.00143v1
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... nite-dimensional QSDE is reduced to a low-dimensional deterministic non-unitary differential equation for the state evolution of the standing system, and the outgoing flying-qubit states can be calculated via randomly occurring quantum jumps. This makes it possible, as demonstrated by examples of flying-qubit generation and transformation, to analyze general cases when the number of excitations is not reserved. The proposed framework lays the foundation for the design of flying-qubit control systems from a control theoretic point of view, within which advanced control techniques can be incorporated for practical applications.
Energy cost for controlling complex networks
[article]
2018
arXiv
pre-print
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The controllability of complex networks has received much attention recently, which tells whether we can steer a system from an initial state to any final state within finite time with admissible external inputs. In order to accomplish the control in practice at the minimum cost, we must study how much control energy is needed to reach the desired final state. At a given control distance between the initial and final states, existing results present the scaling behavior of lower bounds of the
arXiv:1809.06067v1
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... nimum energy in terms of the control time analytically. However, to reach an arbitrary final state at a given control distance, the minimum energy is actually dominated by the upper bound, whose analytic expression still remains elusive. Here we theoretically show the scaling behavior of the upper bound of the minimum energy in terms of the time required to achieve control. Apart from validating the analytical results with numerical simulations, our findings are feasible to the scenario with any number of nodes that receive inputs directly and any types of networks. Moreover, more precise analytical results for the lower bound of the minimum energy are derived in the proposed framework. Our results pave the way to implement realistic control over various complex networks with the minimum control cost.
Analysis of Quantum Linear Systems' Response to Multi-photon States
[article]
2013
arXiv
pre-print
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The results presented here generalize those in the single-photon setting studied in (Milburn, 2008) and (Zhang and James, 2013}). ...
Zhang) . ...
& James, 2011 , Zhang & James, 2012 . ...
arXiv:1311.0357v1
fatcat:6hamsmzidzdungz5ulkyqkf2mq
OnePose: One-Shot Object Pose Estimation without CAD Models
[article]
2022
arXiv
pre-print
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We propose a new method named OnePose for object pose estimation. Unlike existing instance-level or category-level methods, OnePose does not rely on CAD models and can handle objects in arbitrary categories without instance- or category-specific network training. OnePose draws the idea from visual localization and only requires a simple RGB video scan of the object to build a sparse SfM model of the object. Then, this model is registered to new query images with a generic feature matching
arXiv:2205.12257v1
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... k. To mitigate the slow runtime of existing visual localization methods, we propose a new graph attention network that directly matches 2D interest points in the query image with the 3D points in the SfM model, resulting in efficient and robust pose estimation. Combined with a feature-based pose tracker, OnePose is able to stably detect and track 6D poses of everyday household objects in real-time. We also collected a large-scale dataset that consists of 450 sequences of 150 objects.
Geometric measure of entanglement of multipartite mixed states
[article]
2012
arXiv
pre-print
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The geometric measure of entanglement of a pure state, defined by its distance to the set of pure separable states, is extended to multipartite mixed states. We characterize the nearest disentangled mixed state to a given mixed state with respect to this measure by a system of equations. The entanglement eigenvalue for a mixed state is introduced. For a given mixed state, we show that its nearest disentangled mixed state is associated with its entanglement eigenvalue.
arXiv:1204.4317v1
fatcat:xaabz5qhpbbilj6bwv4yue2kqe
PVO: Panoptic Visual Odometry
[article]
2022
arXiv
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We present a novel panoptic visual odometry framework, termed PVO, to achieve a more comprehensive modeling of the scene's motion, geometry, and panoptic segmentation information. PVO models visual odometry (VO) and video panoptic segmentation (VPS) in a unified view, enabling the two tasks to facilitate each other. Specifically, we introduce a panoptic update module into the VO module, which operates on the image panoptic segmentation. This Panoptic-Enhanced VO module can trim the interference
arXiv:2207.01610v1
fatcat:pqps6zj4tjgttfckeanb3pjvae
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... of dynamic objects in the camera pose estimation by adjusting the weights of optimized camera poses. On the other hand, the VO-Enhanced VPS module improves the segmentation accuracy by fusing the panoptic segmentation result of the current frame on the fly to the adjacent frames, using geometric information such as camera pose, depth, and optical flow obtained from the VO module. These two modules contribute to each other through a recurrent iterative optimization. Extensive experiments demonstrate that PVO outperforms state-of-the-art methods in both visual odometry and video panoptic segmentation tasks. Code and data are available on the project webpage: tt .
Classical and Quantum Stochastic Models of Resistive and Memristive Circuits
[article]
2015
arXiv
pre-print
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The purpose of this paper is to examine stochastic Markovian models for circuits in phase space for which the drift term is equivalent to the standard circuit equations. In particular we include dissipative components corresponding to both a resistor and a memristor in series. We obtain a dilation of the problem for which is canonical in the sense that the underlying Poisson Brackets structure is preserved under the stochastic flow. We do this first of all for standard Wiener noise, but also
arXiv:1510.08243v1
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... at the problem using a new concept of symplectic noise where the Poisson structure is extended to the noise as well as the circuit variables, and in particular where we have canonically conjugate noises. Finally we construct a dilation which describes the quantum mechanical analogue.
The Kalman Decomposition for Linear Quantum Stochastic Systems
[article]
2016
arXiv
pre-print
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Zhang is with the Department of Applied Mathematics, The Hong Kong Polytechnic University, Hong Kong Guofeng.Zhang@polyu.edu.hk John Gough is with the Department of Physics, Aberystwyth University, Wales ...
Putting everything together, we have that
are with the School of Engineering and Information Technology, UNSW Canberra, Canberra BC 2610, Australia symeon.grivopoulos@gmail.com, i.r.petersen@gmail.com Guofeng ...
arXiv:1609.05982v1
fatcat:4f7vfooyk5b6pp7m64rbguyyn4
On realization theory of quantum linear systems
2015
Automatica
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More discussions on physical realizability of quantum linear systems can be found in, e.g., [James, Nurdin & Petersen, 2008] ; [Zhang & James, 2011] ; [Zhang & James, 2012 ]. ...
; [Matyas, et al., 2011] ; [Tian, 2012] ; [Zhang, et al., 2013] ; linear system, namely, the number of system oscillators. ...
doi:10.1016/j.automatica.2015.06.023
fatcat:sf5ho2g6xff5le6rq47pjcldnm
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