Results 11 to 20 of about 4,583,269 (264)
Narrow bounds for the quantum capacity of thermal attenuators [PDF]
Nat Commun, 2018 Thermal attenuator channels model the decoherence of quantum systems interacting with a thermal bath, e.g., a two-level system subject to thermal noise and an electromagnetic signal traveling through a fiber or in free-space.
M. Rosati, A. Mari, V. Giovannetti
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Collective heat capacity for quantum thermometry and quantum engine enhancements [PDF]
New Journal of Physics, 2020 The performances of quantum thermometry in thermal equilibrium together with the output power of certain class of quantum engines share a common characteristic: both are determined by the heat capacity of the probe or working medium.
C L Latune, I Sinayskiy, F Petruccione
doaj +2 more sources
Algorithmic superactivation of asymptotic quantum capacity of zero-capacity quantum channels [PDF]
Information Sciences, 2013 The superactivation of zero-capacity quantum channels makes it possible to use two zero-capacity quantum channels with a positive joint capacity for their output. Currently, we have no theoretical background to describe all possible combinations of superactive zero-capacity channels; hence, there may be many other possible combinations. In practice, to
Sandor Imre, Laszlo Gyongyosi
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The capacity of the quantum depolarizing channel [PDF]
IEEE Transactions on Information Theory, 2003 25 pages, no figures; error in earlier version corrected; discussion of qubit depolarizing channel ...
Christopher King
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Continuity of Quantum Channel Capacities [PDF]
Communications in Mathematical Physics, 2009 We prove that a broad array of capacities of a quantum channel are continuous. That is, two channels that are close with respect to the diamond norm have correspondingly similar communication capabilities. We first show that the classical capacity, quantum capacity, and private classical capacity are continuous, with the variation on arguments epsilon ...
Debbie Leung, Graeme Smith
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Private Capacity of Quantum Channels is Not Additive [PDF]
Physical Review Letters, 2009 Recently there has been considerable activity on the subject of additivity of various quantum channel capacities. Here, we construct a family of channels with sharply bounded classical, hence private capacity. On the other hand, their quantum capacity when combined with a zero private (and zero quantum) capacity erasure channel, becomes larger than the
Xu-Bo Zou +4 more
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Quantum Enigma Machines and the Locking Capacity of a Quantum Channel [PDF]
Physical Review X, 2014 The locking effect is a phenomenon that is unique to quantum information theory and represents one of the strongest separations between the classical and quantum theories of information.
Saikat Guha +7 more
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The Quantum Zeno Capacity and Dynamic Evolution Mode of a Quantum System [PDF]
EntropyThe quantum Zeno effect (QZE) is widely employed in quantum engineering due to the issue of frequent measurements freezing a quantum system. In this study, the quantum Zeno factor is introduced to characterize the quantum Zeno capacity of a quantum ...
Zhenbo Ni, Yonggang Peng, Yujun Zheng
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On the classical capacity of quantum Gaussian channels [PDF]
Physica Scripta, 2011 The set of quantum Gaussian channels acting on one bosonic mode can be classified according to the action of the group of Gaussian unitaries. We look for bounds on the classical capacity for channels belonging to such a classification. Lower bounds can be efficiently calculated by restricting to Gaussian encodings, for which we provide analytical ...
Cosmo Lupo +3 more
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Direct Generation and Non-Hermitian Regulation of Energy-Time-Polarization-Hyper-Entangled Quadphotons [PDF]
SensorsEntangled multiphoton is an ideal resource for quantum information technology. Here, narrow-bandwidth hyper-entangled quadphoton is theoretically demonstrated by quantizing degenerate Zeeman sub states through spontaneous eight-wave mixing (EWM) in a hot
Rui Zhuang +6 more
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