Squeezed States in Phase-Sensing Interferometers
The use of squeezed states in Michelson interferometer gravity-wave detectors was considered by Caves1, and a substantial improvement in performance over conventional (coherent state) interferometers was predicted. Caves’ work dealt in detail only with direct detection methods, whereas it is known that optical homodyne detection of squeezed states generally provides a higher signal-to-noise ratio (SNR) than does direct detection. Furthermore, a minimum uncertainty squeezed state is the optimum state to use with homodyne detection, as it yields the highest SNR of any state2. In this paper, phase-sensing interferometers will be considered with respect to their quantum state input/output characteristics, and the value of using homodyne rather than direct detection will be examined.
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