Measuring a photonic qubit without destroying it

G. J. Pryde; J. L. O'Brien; A. G. White; S. D. Bartlett; T. C. Ralph

doi:10.1103/PhysRevLett.92.190402

Measuring a photonic qubit without destroying it

G. J. Pryde, J. L. O'Brien, A. G. White, S. D. Bartlett, T. C. Ralph

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Abstract

A nondeterministic scheme for general measurement of a flying qubit was demonstrated and characterized. The first set of fidelity measures were introduced to characterize the quality of quantum nondemolition (QND) measurement. This measurement uses only linear optics and photodetection of ancillary modes to induce a strong nonlinearity at the single-photon level. It was found that this QND measurement vary continuously into the weak regime and use to perform a nondestructive test of complementarity in quantum mechanics.

Original language	English
Article number	193002
Journal	Physical Review Letters
Volume	92
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.92.190402
Publication status	Published - 14 May 2004
Externally published	Yes

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AU - Ralph, T. C.

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Measuring a photonic qubit without destroying it

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