Entanglement Increases the Error-Correcting Ability of Quantum Error-Correcting Codes

Details Entanglement Increases the Error-Correcting Ability of Quantum Error-Correcting Codes Entanglement Increases the Error-Correcting Ability of Quantum Error-Correcting Codes

2010-08-16

arxiv.org/abs/1008.2598v2

Physics

Quantum Physics

39 pages, 10 tables

Scientific paper

If entanglement is available, the error-correcting ability of quantum codes can be increased. We show how to optimize the minimum distance of an entanglement-assisted quantum error-correcting (EAQEC) code, obtained by adding ebits to a standard quantum error-correcting code, over different encoding operators. By this encoding optimization procedure, we found several new EAQEC codes, including a family of [[n, 1, n; n-1]] EAQEC codes for n odd and code parameters [[7, 1, 5; 2]], [[7, 1, 5; 3]], [[9, 1, 7; 4]], [[9, 1, 7; 5]], which saturate the quantum singleton bound for EAQEC codes. A random search algorithm for the encoding optimization procedure is also proposed.

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