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Unitary Dynamics for Quantum Codewords

In: Quantum Communication, Computing, and Measurement

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  • Asher Peres

    (University of California, Institute for Theoretical Physics)

Abstract

A quantum codeword is a redundant representation of a logical qubit by means of several physical qubits. It is constructed in such a way that if one of the physical qubits is perturbed, for example if it gets entangled with an unknown environment, there still is enough information encoded in the other physical qubits to restore the logical qubit, and disentangle it from the environment. The recovery procedure may consist of the detection of an error syndrome, followed by the correction of the error, as in the classical case. However, it can also be performed by means of unitary operations, without having to know the error syndrome.

Suggested Citation

  • Asher Peres, 1997. "Unitary Dynamics for Quantum Codewords," Springer Books, in: O. Hirota & A. S. Holevo & C. M. Caves (ed.), Quantum Communication, Computing, and Measurement, pages 171-179, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4615-5923-8_18
    DOI: 10.1007/978-1-4615-5923-8_18
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