Correcting quantum channels by measuring the environment

Details Correcting quantum channels by measuring the environment Correcting quantum channels by measuring the environment

2004-09-03

arxiv.org/abs/quant-ph/0409026v1

Quantum Information and Computation 5(2):156-160, 2005.

Physics

Quantum Physics

Scientific paper

The corrected capacity of a quantum channel is defined as the best one-shot capacity that can be obtained by measuring the environment and using the result to correct the output of the channel. It is shown that (i) all qubit channels have corrected capacity log 2, (ii) a product of N qubit channels has corrected capacity N log 2, and (iii) all channels have corrected capacity at least log 2. The question is posed of finding the channel with smallest corrected capacity in any dimension d.

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