Results 61 to 70 of about 4,583,269 (264)
Detecting quantum capacities of continuous-variable quantum channels
Physical Review Research, 2022 Quantum communication channels and quantum memories are the fundamental building blocks of large-scale quantum communication networks. Estimating their capacity to transmit and store quantum information is crucial in order to assess the performance of ...
Ya-Dong Wu, Giulio Chiribella
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Thermodynamic Capacity of Quantum Processes
Physical Review Letters, 2019 6 pages, 2 figures, journal version. The technical appendix was split off into a companion paper that will be submitted separately (cf. today's arXiv listing)
Mario Berta +3 more
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Information flow and error scaling for fully quantum control
Physical Review Research, 2022 The optimally designed control of quantum systems is playing an increasingly important role to engineer novel and more efficient quantum technologies. Here, in the scenario represented by controlling an arbitrary quantum system via the interaction with ...
Stefano Gherardini +4 more
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Activation of zero-error classical capacity in low-dimensional quantum systems [PDF]
Phys. Rev. A 97, 062314 (2018), 2018 Channel capacities of quantum channels can be nonadditive even if one of two quantum channels has no channel capacity. We call this phenomenon \emph{activation} of the channel capacity. In this paper, we show that when we use a quantum channel on a qubit system, only a noiseless qubit channel can generate the activation of the zero-error classical ...
arxiv +1 more source
Quantum capacities for entanglement networks [PDF]
2016 IEEE International Symposium on Information Theory (ISIT), 2016 We discuss quantum capacities for two types of entanglement networks: $\mathcal{Q}$ for the quantum repeater network with free classical communication, and $\mathcal{R}$ for the tensor network as the rank of the linear operation represented by the tensor network.
Nengkun Yu +3 more
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Quantum Capacity Approaching Codes for the Detected-Jump Channel [PDF]
Physical Review A, vol. 82, no. 6, December 2010, 062324, 2010 The quantum channel capacity gives the ultimate limit for the rate at which quantum data can be reliably transmitted through a noisy quantum channel. Degradable quantum channels are among the few channels whose quantum capacities are known. Given the quantum capacity of a degradable channel, it remains challenging to find a practical coding scheme ...
arxiv +1 more source
QUANTUM ZERO-ERROR CAPACITY [PDF]
International Journal of Quantum Information, 2005 We define a new kind of quantum channel capacity by extending the concept of zero-error capacity for a noisy quantum channel. The necessary requirement for which a quantum channel has zero-error capacity greater than zero is given. Finally, we point out some directions on how to calculate the zero-error capacity of such channels.
Rex A. C. Medeiros +1 more
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Quantum Biological Channel Modeling and Capacity Calculation
Life, 2012 Quantum mechanics has an important role in photosynthesis, magnetoreception, and evolution. There were many attempts in an effort to explain the structure of genetic code and transfer of information from DNA to protein by using the concepts of quantum ...
Ivan B. Djordjevic
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Secret Message Transmission over Quantum Channels under Adversarial Quantum Noise: Secrecy Capacity and Super-Activation [PDF]
arXiv, 2017 We determine the secrecy capacities of AVQCs (arbitrarily varying quantum channels). Both secrecy capacity with average error probability and with maximal error probability are derived. Both derivations are based on one common code construction. The code we construct fulfills a stringent secrecy requirement, which is called the strong code concept.
Holger Boche +3 more
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Detecting positive quantum capacities of quantum channels
npj Quantum Information, 2022 AbstractDetermining whether a noisy quantum channel can be used to reliably transmit quantum information is a challenging problem in quantum information theory. This is because it requires computation of the channel’s coherent information for an unbounded number of copies of the channel.
Singh, S, Datta, N
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