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The capacity of a quantum channel for simultaneous transmission of classical and quantum information

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arxiv quant-ph/0311131 v3 pith:VT5QHPRT submitted 2003-11-19 quant-ph

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keywords quantumchannelclassicalsimultaneouscapacityexpressioninformationtransmission
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An expression is derived characterizing the set of admissible rate pairs for simultaneous transmission of classical and quantum information over a given quantum channel, generalizing both the classical and quantum capacities of the channel. Although our formula involves regularization, i.e. taking a limit over many copies of the channel, it reduces to a single-letter expression in the case of generalized dephasing channels. Analogous formulae are conjectured for the simultaneous public-private capacity of a quantum channel and for the simultaneously 1-way distillable common randomness and entanglement of a bipartite quantum state.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Sharp Quantum Capacity Thresholds: Exponential Strong Converses for Degradable and Antidegradable Channels

    quant-ph 2026-08 accept novelty 8.0 of 10

    Every finite-dimensional degradable or antidegradable quantum channel has an exponential strong converse: above capacity, all coding schemes have fidelity decaying exponentially in the number of channel uses.

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