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Distributed quantum computation with arbitrarily poor photon detection

Yuichiro Matsuzaki, Simon C. Benjamin, Joseph Fitzsimons
2010 Physical Review A. Atomic, Molecular, and Optical Physics  
Typically the network is optical and inter-node entanglement involves photon detection.  ...  In complex networks the entanglement fidelity may be degraded by the twin problems of photon loss and dark counts.  ...  As we show in theFIG. 4: The effect of an imperfect single photon source. The plots .  ... 
doi:10.1103/physreva.82.010302 fatcat:pgqv5fu3qvgs7kf5gwoot27xpq

Why I am optimistic about the silicon-photonic route to quantum computing [article]

Terry Rudolph
2016 arXiv   pre-print
There are a large number of questions regarding the optimum ways to make and use the final cluster state, dealing with static imperfections, constructing the initial entangled photon sources and so on,  ...  At present the fully-integrated, silicon-photonic architecture we envisage involves creating the required entangled states by starting with single-photons produced non-determistically by pumping silicon  ...  Such characterization can also be achieved with repeated use of single photons instead, if such sources are more readily at hand on the chip.  ... 
arXiv:1607.08535v1 fatcat:s5uhpw2iiffmxknsg3q4blyc7a

Unconditional quantum teleportation between distant solid-state quantum bits

W. Pfaff, B. J. Hensen, H. Bernien, S. B. van Dam, M. S. Blok, T. H. Taminiau, M. J. Tiggelman, R. N. Schouten, M. Markham, D. J. Twitchen, R. Hanson
2014 Science  
We prepare the teleporter through photon-mediated heralded entanglement between two distant electron spins and subsequently encode the source qubit in a single nuclear spin.  ...  By realizing a fully deterministic Bell-state measurement combined with real-time feed-forward we achieve teleportation in each attempt while obtaining an average state fidelity exceeding the classical  ...  When provided with a single copy of an unknown quantum state, directly sending the state in a carrier such as a photon is unreliable due to inevitable losses.  ... 
doi:10.1126/science.1253512 pmid:25082696 fatcat:uk53ehzrb5dedexm4bnbzhoyqm

Topologically protected entangled photonic states

Michelle Wang, Cooper Doyle, Bryn Bell, Matthew J. Collins, Eric Magi, Benjamin J. Eggleton, Mordechai Segev, Andrea Blanco-Redondo
2019 Nanophotonics  
Whereas topological protection of single photons and correlated photons has been recently demonstrated experimentally, the observation of topologically protected entangled states has thus far remained  ...  Here, we experimentally demonstrate the topological protection of spatially entangled biphoton states.  ...  The photon number distribution of single photons shows lower variance than classical light, and hence such experiments could have an impact in achieving sources with lower noise.  ... 
doi:10.1515/nanoph-2019-0058 fatcat:rgq2oplkgngrph2pjrvindoe5y

Implementation vulnerabilities in general quantum cryptography

Anqi Huang, Stefanie Barz, Erika Andersson, Vadim Makarov
2018 New Journal of Physics  
However, generally, initial implementations with practical imperfections might open loopholes, allowing an eavesdropper to compromise the security of a quantum cryptographic system.  ...  We survey quantum digital signatures, quantum secret sharing, source-independent quantum random number generation, quantum secure direct communication, and blind quantum computing.  ...  Except for imperfect phase modulation, another possible issue is the photon source itself.  ... 
doi:10.1088/1367-2630/aade06 fatcat:f3uwzcswdfdlbchwfrv3bx3b74

Towards Quantum Repeaters with Solid-State Qubits: Spin-Photon Entanglement Generation Using Self-assembled Quantum Dots [chapter]

Peter L. McMahon, Kristiaan De Greve
2015 Engineering the Atom-Photon Interaction  
entanglement between a quantum memory (electron spin qubit) and a flying qubit (polarization- or frequency-encoded photonic qubit).  ...  This is a first step towards demonstrating entanglement between distant quantum memories (realized with quantum dots), which in turn is a milestone in the roadmap for building a functional quantum repeater  ...  Acknowledgements We would like to acknowledge our coauthors of those papers covered in this chapter that we were involved in (namely References [13, 21, 24] ), with whom we had many valuable discussions  ... 
doi:10.1007/978-3-319-19231-4_14 fatcat:o6fouv6k2fau3kydmy7oat56fq

All-photonic quantum teleportation using on-demand solid-state quantum emitters

Marcus Reindl, Daniel Huber, Christian Schimpf, Saimon F. Covre da Silva, Michele B. Rota, Huiying Huang, Val Zwiller, Klaus D. Jöns, Armando Rastelli, Rinaldo Trotta
2018 Science Advances  
This quantum phenomenon is built up around the nonlocal properties of entangled states of light that, in the perspective of real-life applications, should be encoded on photon pairs generated on demand  ...  Despite recent advances, however, the exploitation of deterministic quantum light sources in push-button quantum teleportation schemes remains a major open challenge.  ...  Among others (11) , semiconductor quantum dots (QDs) are emerging as near-optimal sources of indistinguishable single photons (12, 13) , as well as on-demand entangled photon pairs (14) .  ... 
doi:10.1126/sciadv.aau1255 fatcat:agwrwtd2ibaafnkjs32hkjywna

Entanglement-secured single-qubit quantum secret sharing

P. Scherpelz, R. Resch, D. Berryrieser, T. W. Lynn
2011 Physical Review A. Atomic, Molecular, and Optical Physics  
We present a protocol for single-qubit quantum secret sharing using polarization entanglement of photon pairs produced in type-I spontaneous parametric downconversion.  ...  We implement the entanglement-based secret-sharing protocol with 87% secret-sharing fidelity, limited by the purity of the entangled state produced by our present apparatus.  ...  The imperfect 87% fidelity of secret sharing can be attributed to imperfect entanglement, or purity P < 1, of our entangled state produced by SPDC.  ... 
doi:10.1103/physreva.84.032303 fatcat:t247h5qw2zav5iw7cckdym2ruq

Concurrent remote entanglement with quantum error correction against photon losses

Ananda Roy, A. Douglas Stone, Liang Jiang
2016 Physical Review A  
We demonstrate the resilience of our quantum-error-correcting remote entanglement scheme to imperfections.  ...  We present a new protocol to remotely entangle two stationary qubits by first entangling them with propagating ancilla qubits and then performing a joint two-qubit measurement on the ancillas.  ...  Second, the error correcting encoding we used is designed to protect against losses of single-photons to first order.  ... 
doi:10.1103/physreva.94.032333 fatcat:eb2qqp45bzb2bk5fwk3cytz53u

An integrated diamond nanophotonics platform for quantum-optical networks

A. Sipahigil, R. E. Evans, D. D. Sukachev, M. J. Burek, J. Borregaard, M. K. Bhaskar, C. T. Nguyen, J. L. Pacheco, H. A. Atikian, C. Meuwly, R. M. Camacho, F. Jelezko (+4 others)
2016 Science  
We use Raman transitions to realize a single-photon source with a tunable frequency and bandwidth in a diamond waveguide.  ...  Finally, we create entanglement between two SiV centers by detecting indistinguishable Raman photons emitted into a single waveguide.  ...  Raman transitions are used to realize a single-photon source with a tunable frequency and bandwidth in a diamond waveguide.  ... 
doi:10.1126/science.aah6875 pmid:27738014 fatcat:7gvuxzhdrvaf7fvx5qbbny4hnu

Long-term transmission of entangled photons from single quantum dot over deployed fiber [article]

Zi-Heng Xiang, Jan Huwer, R. Mark Stevenson, Joanna Skiba-Szymanska, Martin B. Ward, Ian Farrer, David A. Ritchie, Andrew J. Shields
2018 arXiv   pre-print
Here, we report a week-long transmission of polarization-entangled photons from a single InAs/GaAs quantum dot over a metropolitan network fiber.  ...  Stable transmission of polarization-encoded entanglement with a high fidelity of 91% is achieved, facilitating the operation of sub-Poissonian quantum light sources over existing fiber networks.  ...  The transmitted photons exhibit a constantly high entanglement fidelity of 91.3% with their partner photons measured locally, corresponding to a drop in fidelity by only 3.4% with respect to the source  ... 
arXiv:1807.10690v1 fatcat:nyr3a5syerflvprsh2633wup7m

Error protected qubits in a silicon photonic chip [article]

Caterina Vigliar, Stefano Paesani, Yunhong Ding, Jeremy C. Adcock, Jianwei Wang, Sam Morley-Short, Davide Bacco, Leif K. Oxenløwe, Mark G. Thompson, John G. Rarity, Anthony Laing
2020 arXiv   pre-print
Here we propose and demonstrate an integrated silicon photonic architecture that both entangles multiple photons, and encodes multiple physical qubits on individual photons, to produce error-protected  ...  General purpose quantum computers can, in principle, entangle a number of noisy physical qubits to realise composite qubits protected against errors.  ...  Small clusters of qubits are encoded in single photons; multiple photons are then fused together with probabilistic entangling gates.  ... 
arXiv:2009.08339v1 fatcat:l7ajq6tqfbglpndnqzj2op2d3e

Rate-distance tradeoff and resource costs for all-optical quantum repeaters

Mihir Pant, Hari Krovi, Dirk Englund, Saikat Guha
2017 Physical Review A  
repeaters so as to outperform R_ direct(η), from ∼ 10^11 to ∼ 10^6 photon sources per repeater node.  ...  We present a resource-performance tradeoff of an all-optical quantum repeater that uses photon sources, linear optics, photon detectors and classical feedforward at each repeater node, but no quantum memories  ...  the required clusters using a network of passive linear optics (i.e., beamsplitters and phase shifters), imperfect ondemand sources with loss (see section II for a description of the source), single photon  ... 
doi:10.1103/physreva.95.012304 fatcat:mr4gquwkybe6rouyl4lznxuklq

Security Analysis of Measurement-device-independent Quantum Secure Direct Communication [article]

Peng-Hao Niu, Jia-Wei Wu, Liu-Guo Yin, Gui-Lu Long
2020 arXiv   pre-print
the security loopholes originating from the imperfections in measurement devices so that enable application of QSDC with current technology.  ...  Therefore QSDC is possible with current measurement devices by sacrificing a small amount in the capacity.  ...  While photons in M B , which is still held by Bob and were entangled with those in M A after Charlie's Bell measurement, will collapse into single photon states.  ... 
arXiv:2006.07184v2 fatcat:kgkkoywjwrgtpmlfnpvrsm4omu

Worldwide standardization activity for quantum key distribution

Romain Alleaume, Ivo P. Degiovanni, Alan Mink, Thomas E. Chapuran, Norbert Lutkenhaus, Momtchil Peev, Christopher J. Chunnilall, Vincente Martin, Marco Lucamarini, Martin Ward, Andrew Shields
2014 2014 IEEE Globecom Workshops (GC Wkshps)  
The long term goal is to develop a certification methodology that bridges the gap between theoretical proofs and practical implementations with imperfect devices.  ...  Widely known side channels are those related to the losses of the quantum channel and to imperfections of the photon source or the single-photon detectors.  ...  Current activities include standards for the characterization of key components including single photon sources and detectors.  ... 
doi:10.1109/glocomw.2014.7063507 dblp:conf/globecom/AlleaumeDMCLPCM14 fatcat:ptcgolzn55b7zn7n7zav7hg3me
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