Ultrasensitive Beam Deflection Measurement via Interferometric Weak Value Amplification

Details Ultrasensitive Beam Deflection Measurement via Interferometric Weak Value Amplification Ultrasensitive Beam Deflection Measurement via Interferometric Weak Value Amplification

2009-06-26

arxiv.org/abs/0906.4828v1

Phys. Rev. Lett. 102, 173601 (2009)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.102.173601

We report on the use of an interferometric weak value technique to amplify very small transverse deflections of an optical beam. By entangling the beam's transverse degrees of freedom with the which-path states of a Sagnac interferometer, it is possible to realize an optical amplifier for polarization independent deflections. The theory for the interferometric weak value amplification method is presented along with the experimental results, which are in good agreement. Of particular interest, we measured the angular deflection of a mirror down to 560 femtoradians and the linear travel of a piezo actuator down to 20 femtometers.

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