Optimum Small Optical Beam Displacement Measurement

Details Optimum Small Optical Beam Displacement Measurement Optimum Small Optical Beam Displacement Measurement

2004-07-27

arxiv.org/abs/quant-ph/0407209v1

J. Opt. B: Quantum Semiclass. Opt. 6 (2004) 495-501

Physics

Quantum Physics

13 pages, 7 figures

Scientific paper

10.1088/1464-4266/6/12/003

We derive the quantum noise limit for the optical beam displacement of a TEM00 mode. Using a multimodal analysis, we show that the conventional split detection scheme for measuring beam displacement is non-optimal with 80% efficiency. We propose a new displacement measurement scheme that is optimal for small beam displacement. This scheme utilises a homodyne detection setup that has a TEM10 mode local oscillator. We show that although the quantum noise limit to displacement measurement can be surpassed using squeezed light in appropriate spatial modes for both schemes, the TEM10 homodyning scheme out-performs split detection for all values of squeezing.

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