Coherent quantum states in resonant‐mass gravitational wave detectors

Abstract

This work describes the importance of quantum coherent states when a resonant-mass gravitational wave detector absorbs energy from a gravitational wave in an amount very close to the quantum limit. In this case, quantum non-demolition measurements become essential as well. As the main result, for a coherent-state signal, the detector behaves as if the signal was a classical one.

Main Experiments for Detection of Gravitational Waves at Frequency below 3 kHz: A Quick Review

“…The resonant-mass gravitational wave detector Figure 4 shows an example of a second-generation resonant-mass GW detector which operated for about two decades at Louisiana State University. This detector was called Allegro, as can be seen in [7]. This kind of detector operating in their quantum limit can be used to calibrate interferometric GW detectors, as can be seen in [8,9], as these detectors are narrowband they cannot give the behavior of the GW with the frequency.…”