This paper describes a technique that allows measurement of very small alternating accelerations. It is based on a quantum version of a lock-in amplifier,1 which filters out spectral components far from the frequency of the measured signal, improving the signal-to-noise ratio of the measurement. As a proof-of-principle, a controlled experiment using microwave radiation is performed, modulating the phase of the control pulses at a given frequency. A strong response at twice the modulation frequency is observed as expected. Preliminary results of measurements taken with Raman control are also presented, in which a controlled modulation of the phase was obtained by modulating a piezoelectric actuator, causing one of the Raman mirrors to vibrate.
Jonathan Coslovsky, Gadi Afek, and Nir Davidson, "AC atom interferometry with quantum lock-in sensing," Proc. SPIE 10119, Slow Light, Fast Light, and Opto-Atomic Precision Metrology X, 1011903 (Presented at SPIE OPTO: January 30, 2017; Published: 20 February 2017); https://doi.org/10.1117/12.2257344.
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