For current experimental parameters, SU(1,1) interferometers give no Fisher-information advantage over SU(2) for spacetime fluctuation estimation; with assumed future low-loss, high-power parameters they do.
The correspond- ing operators at the two output ports are (ˆ a3, ˆa†
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Estimating spacetime fluctuation strength in SU(1,1) and SU(2) interferometers
For current experimental parameters, SU(1,1) interferometers give no Fisher-information advantage over SU(2) for spacetime fluctuation estimation; with assumed future low-loss, high-power parameters they do.