Retrodictive fidelities for pure state postselectors

Details Retrodictive fidelities for pure state postselectors Retrodictive fidelities for pure state postselectors

Publishing date

2006-08-14

URL

arxiv.org/abs/quant-ph/0608113v3

Journals

New J. Phys. 8, 268 (2006)

Science

Physics

Field

Quantum Physics

Additional info

8 Pages, 5 Figs. Accepted version, typos corrected

Type

Scientific paper

Digital Object Identifier

10.1088/1367-2630/8/11/268

Abstract

Two measures of fidelity are proposed for postselecting devices, the retrodictive conditional probability that the state in the measurement arm is the one indicated by the detectors, and the probability that the device produces the state that it would produce if working perfectly. The first is the natural quantity that one wishes to maximise to improve the device operation. The second corresponds more closely with the accurate operation of the device than the more usual overlap-based fidelity. The results are particularly applicable to the types of state preparation and logic gate operation in linear optical quantum computing.

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