Multimode capacity of atomic-frequency comb quantum memories [PDF]
Quantum Science and Technology, 2022 Ensemble-based quantum memories are key to developing multiplexed quantum repeaters, able to overcome the intrinsic rate limitation imposed by finite communication times over long distances.
A. Ortu +7 more
semanticscholar +1 more source
Channel capacity of relativistic quantum communication with rapid interaction [PDF]
Physical Review D, 2022 In this work we study nonperturbatively the transmission of classical and quantum information in globally hyperbolic spacetimes, where the communication channel is between two qubit detectors interacting with a quantized massless scalar field via delta ...
Erickson Tjoa, Kensuke Gallock-Yoshimura
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Quantum Capacity Bounds of Gaussian Thermal Loss Channels and Achievable Rates With Gottesman-Kitaev-Preskill Codes [PDF]
IEEE Transactions on Information Theory, 2018 Gaussian thermal loss channels are of particular importance to quantum communication theory since they model realistic optical communication channels. Except for special cases, the quantum capacity of Gaussian thermal loss channels is not yet quantified ...
Kyungjoo Noh +2 more
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Optimal storage capacity of quantum Hopfield neural networks
Physical Review Research, 2023 Quantum neural networks form one pillar of the emergent field of quantum machine learning. Here quantum generalizations of classical networks realizing associative memories—capable of retrieving patterns, or memories, from corrupted initial states—have ...
Lukas Bödeker +2 more
doaj +1 more source
Coherent information of a quantum channel or its complement is generically positive [PDF]
Quantum, 2022 The task of determining whether a given quantum channel has positive capacity to transmit quantum information is a fundamental open problem in quantum information theory.
Satvik Singh, Nilanjana Datta
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Capacity theorems for quantum multiple-access channels: classical-quantum and quantum-quantum capacity regions [PDF]
IEEE Transactions on Information Theory, 2008 We consider quantum channels with two senders and one receiver. For an arbitrary such channel, we give multi-letter characterizations of two different two-dimensional capacity regions. The first region is comprised of the rates at which it is possible for one sender to send classical information, while the other sends quantum information.
Yard, Jon +2 more
openaire +5 more sources
Quantum Flags and New Bounds on the Quantum Capacity of the Depolarizing Channel. [PDF]
Physical Review Letters, 2019 A new upper bound for the quantum capacity of the d-dimensional depolarizing channels is presented. Our derivation makes use of a flagged extension of the map where the receiver obtains a copy of a state σ_{0} whenever the messages are transmitted ...
Marco Fanizza +2 more
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Capacity-approaching quantum repeaters for quantum communications [PDF]
Physical Review A, 2020 Revised
Ghalaii, Masoud, Pirandola, Stefano
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Resource theory of unextendibility and nonasymptotic quantum capacity [PDF]
Physical Review A, 2018 In this paper, we introduce the resource theory of unextendibility as a relaxation of the resource theory of entanglement. The free states in this resource theory are the k-extendible states, associated with the inability to extend quantum entanglement ...
Eneet Kaur +3 more
semanticscholar +1 more source
Quantum codes from neural networks
New Journal of Physics, 2020 We examine the usefulness of applying neural networks as a variational state ansatz for many-body quantum systems in the context of quantum information-processing tasks.
Johannes Bausch, Felix Leditzky
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