Le contenu de cette page n’est pas disponible en français. Veuillez nous en excuser.
 

A strong converse for classical channel coding using entangled inputs

Recording Details

Speaker(s): 
Scientific Areas: 
PIRSA Number: 
09050002

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.

Joint work with Robert Koenig.