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Back-action amplification of a signal

Interferometric displacement measurement techniques -developed for instance in the framework of gravitational-wave detection but now envisioned as well to probe the quantum ground state of a macroscopic mechanical resonator- have unequalled sensitivities, better than one attometer, but are a priori limited by the Standard Quantum Limit (SQL), a consequence of the perturbation of the probed object by a meter beam.

The "Quantum Measurement" group has just demonstrated one could take advantage of such a back-action of the probe laser beam to amplify by radiation pressure a signal somewhat similar to a gravitational wave. An amplification factor around 6 has been obtained close to the resonance frequency of one of the mirrors of the measurement cavity.

Such a technique, if implemented on a system limited by quantum noise, might allow one to beat the SQL and is envisioned for the next generation of interferometric gravitational-wave detectors.

Synopsis ont the Physical Review Letters website and article

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Back-action amplification of a signal

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