In quantum measurement theory, the sensitivity of a measuring instrument is bounded below by the standard quantum limit (SQL). The expression for SQL obtained by the authors for an exactly solvable problem on a gravitational-wave interference detector enables the estimation of the minimum metric curvature in a periodic gravitational wave in the resonance and nonresonance cases. The authors consider the dependence of SQL on the selection of an observable quantity and on the intensity of a laser beam for the exponential distribution of the number of photons.
Department of Quantum Statistics and Field Theory, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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