From Linear Optical Quantum Computing to Heisenberg-Limited Interferometry

Details From Linear Optical Quantum Computing to Heisenberg-Limited Interferometry From Linear Optical Quantum Computing to Heisenberg-Limited Interferometry

2003-12-19

arxiv.org/abs/quant-ph/0312169v2

J. Opt. B 6, S796 (2004)

Physics

Quantum Physics

10 pages, 5 figures; Submitted to a Special Issue of J. Opt. B on "Fluctuations and Noise in Photonics and Quantum Optics" (He

Scientific paper

10.1088/1464-4266/6/8/026

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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