Search results for "Quantum mutual information"

showing 3 items of 3 documents

Transition behavior in the channel capacity of two-quibit channels with memory

2004

We prove that a general upper bound on the maximal mutual information of quantum channels is saturated in the case of Pauli channels with an arbitrary degree of memory. For a subset of such channels we explicitly identify the optimal signal states. We show analytically that for such a class of channels entangled states are indeed optimal above a given memory threshold.

PhysicsData_CODINGANDINFORMATIONTHEORYCoherent informationQuantum channelQuantum capacityTopologyUpper and lower boundsAtomic and Molecular Physics and OpticsClassical capacityQuantum mechanicsQuantum informationAmplitude damping channelQuantum mutual informationComputer Science::Information Theory
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Mutual information and spontaneous symmetry breaking

2015

We show that the metastable, symmetry-breaking ground states of quantum many-body Hamiltonians have vanishing quantum mutual information between macroscopically separated regions, and are thus the most classical ones among all possible quantum ground states. This statement is obvious only when the symmetry-breaking ground states are simple product states, e.g. at the factorization point. On the other hand, symmetry-breaking states are in general entangled along the entire ordered phase, and to show that they actually feature the least macroscopic correlations compared to their symmetric superpositions is highly non trivial. We prove this result in general, by considering the quantum mutual …

PhysicsQuantum discordQuantum PhysicsStrongly Correlated Electrons (cond-mat.str-el)FOS: Physical sciencesQuantum capacityQuantum entanglementCoherent information01 natural sciencesQuantum relative entropyAtomic and Molecular Physics and Optics010305 fluids & plasmasCondensed Matter - Strongly Correlated ElectronsQuantum mechanicsAtomic and Molecular Physics0103 physical sciencesand Optics010306 general physicsQuantum mutual informationAmplitude damping channelmutual informationQuantum Physics (quant-ph)Joint quantum entropy
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Genuine quantum and classical correlations in multipartite systems

2011

PACS numbers: 03.67.Mn, 03.65.Ud

Quantum discordQuantum PhysicsGeneral Physics and AstronomyFOS: Physical sciencesStrong Subadditivity of Quantum EntropyQuantum relative entropyGeneralized relative entropyMultipartiteQuantum mechanicsStatistical physicsW stateQuantum mutual informationQuantum Physics (quant-ph)Joint quantum entropyMathematics
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