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Published August 14, 2009 | public
Journal Article

A Strong Converse for Classical Channel Coding Using Entangled Inputs

Abstract

A fully general strong converse for channel coding states that when the rate of sending classical information exceeds the capacity of a quantum channel, the probability of correctly decoding goes to zero exponentially in the number of channel uses, even when we allow code states which are entangled across several uses of the channel. Such a statement was previously only known for classical channels and the quantum identity channel. By relating the problem to the additivity of minimum output entropies, we show that a strong converse holds for a large class of channels, including all unital qubit channels, the d-dimensional depolarizing channel and the Werner-Holevo channel. This further justifies the interpretation of the classical capacity as a sharp threshold for information transmission.

Additional Information

©2009 The American Physical Society. Received 30 April 2009; published 14 August 2009. We acknowledge support by NSF Grants No. PHY-04056720 and No. PHY-0803371. 03.67.Hk Quantum communication

Additional details

Created:
August 20, 2023
Modified:
October 19, 2023