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Enhanced Feedback Iterative Decoding of Sparse Quantum Codes

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4 Author(s)
Yun-Jiang Wang ; State Key Lab. of Integrated Services Network, Xidian Univ., Xi''an, China ; Sanders, B.C. ; Bao-Ming Bai ; Xin-Mei Wang

Decoding sparse quantum codes can be accomplished by syndrome-based decoding using a belief propagation (BP) algorithm. We significantly improve this decoding scheme by developing a new feedback adjustment strategy for the standard BP algorithm. In our feedback procedure, we exploit much of the information from stabilizers, not just the syndrome but also the values of the frustrated checks on individual qubits of the code and the channel model. Furthermore we show that our decoding algorithm is superior to belief propagation algorithms using only the syndrome in the feedback procedure for all cases of the depolarizing channel. Our algorithm does not increase the measurement overhead compared to the previous method, as the extra information comes for free from the requisite stabilizer measurements.

Published in:

Information Theory, IEEE Transactions on  (Volume:58 ,  Issue: 2 )

Date of Publication:

Feb. 2012

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