Good quantum error-correcting codes exist
Good quantum error-correcting codes exist
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DOI:
10.1103/physreva.54.1098
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发表时间:
1996-08-01
影响因子:
2.9
通讯作者:
Shor, PW
中科院分区:
文献类型:
--
作者:
Calderbank, AR;Shor, PW
A quantum error-correcting code is defined to be a unitary mapping (encoding) of k qubits (two-state quantum systems) into a subspace of the quantum state space of n qubits such that if any t of the qubits undergo arbitrary decoherence, not necessarily independently, the resulting n qubits can be used to faithfully reconstruct the original quantum state of the k encoded qubits. Quantum error-correcting codes are shown to exist with asymptotic rate k/n=1-2H(2)(2t/n) where H-2(p) is the binary entropy function -plog(2)p-(1-p)log(2)(1-p). Upper bounds on this asymptotic rate are given.