From linear optical quantum computing to Heisenberg-limited interferometry

Hwang Lee, Pieter Kok, Colin P. Williams, and Jonathan P. Dowling

Journal of Optics B 6, S796-S800 (2004)

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The working principles of linear optical quantum computing are based on photodetection, namely, projective measurements. The use of photodetection can provide efficient nonlinear interactions between photons at the single-photon level, which is technically problematic otherwise. We report an application of such a technique to prepare quantum correlations as an important resource for Heisenberg-limited optical interferometry, where the sensitivity of phase measurements can be improved beyond the usual shot-noise limit. Furthermore, using such nonlinearities, optical quantum nondemolition measurements can now be carried out at the single-photon level.

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