Unitary Dynamics for Quantum Codewords

Asher Peres
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Asher Peres: University of California, Institute for Theoretical Physics

A chapter in Quantum Communication, Computing, and Measurement, 1997, pp 171-179 from Springer

Abstract: 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.

Keywords: Entangle State; Unitary Transformation; Quantum Circuit; Quantum Error Correction; Logical Qubit (search for similar items in EconPapers)
Date: 1997
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DOI: 10.1007/978-1-4615-5923-8_18

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