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Error-prevention scheme with two pairs of qubits
Chu, Shih-I Yang, Chui-Ping Han, Siyuan
Chu, Shih-I
Yang, Chui-Ping
Han, Siyuan
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Abstract
A scheme is presented for protecting one-qubit quantum information against decoherence due to a general environment and local exchange interactions. The scheme operates essentially by distributing information over two pairs of qubits and through error-prevention procedures. In the scheme, quantum information is encoded through a decoherence-free subspace for collective phase errors and exchange errors affecting the qubits in pairs; leakage out of the encoding space due to amplitude damping is reduced by quantum Zeno effect. In addition, how to construct decoherence-free states for n-qubit information against phase and exchange errors is discussed.
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This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.66.034301.
Date
2002-09-04
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American Physical Society
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Yang, Chui-Ping., Chu, Shih-I., Han, Siyuan. "Error-prevention scheme with two pairs of qubits." Phys. Rev. A 66, 034301 – Published 4 September 2002. http://dx.doi.org/10.1103/PhysRevA.66.034301.