Title :
On feedback and the classical capacity of a noisy quantum channel
Author :
Bowen, Garry ; Nagarajan, Rajagopal
Author_Institution :
Dept. of Appl. Math. & Theor. Phys., Univ. of Cambridge, UK
Abstract :
In Shannon information theory, the capacity of a memoryless communication channel cannot be increased by the use of feedback from receiver to sender. In this correspondence, the use of classical feedback is shown to provide no increase in the unassisted classical capacity of a memoryless quantum channel when feedback is used across nonentangled input states, or when the channel is an entanglement-breaking channel. This gives a generalization of the Shannon theory for certain classes of feedback protocols when transmitting through noisy quantum communication channels.
Keywords :
channel capacity; information theory; probability; protocols; quantum communication; quantum entanglement; telecommunication channels; Shannon information theory; classical feedback protocol; entanglement-breaking channel; memoryless communication channel; noisy quantum channel capacity; nonentangled input state; quantum channels; Communication channels; Frequency; Information geometry; Information theory; Least squares methods; Probability distribution; Quantum mechanics; State feedback; Statistics; Stochastic systems;
Journal_Title :
Information Theory, IEEE Transactions on
DOI :
10.1109/TIT.2004.839519