Adaptive homodyne measurement of optical phase

Details Adaptive homodyne measurement of optical phase Adaptive homodyne measurement of optical phase

2002-04-01

arxiv.org/abs/quant-ph/0204005v1

Phys. Rev. Lett., 89, 133602 (2002)

Physics

Quantum Physics

RevTex4, color PDF figures (separate files), submitted to PRL

Scientific paper

10.1103/PhysRevLett.89.133602

We present an experimental demonstration of the power of real-time feedback in quantum metrology, confirming a theoretical prediction by Wiseman regarding the superior performance of an adaptive homodyne technique for single-shot measurement of optical phase. For phase measurements performed on weak coherent states with no prior knowledge of the signal phase, we show that the variance of adaptive homodyne estimation approaches closer to the fundamental quantum uncertainty limit than any previously demonstrated technique. Our results underscore the importance of real-time feedback for reaching quantum performance limits in coherent telecommunication, precision measurement and information processing.

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