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Free keywords:
General Relativity and Quantum Cosmology, gr-qc,Quantum Physics, quant-ph
Abstract:
We explore new regimes of laser interferometric gravitational-wave detectors
with multiple optical carriers which allow to reduce the quantum noise of these
detectors. In particular, we show that using two carriers with the opposite
detunings, homodyne angles, and squeezing angles, but identical other
parameters (the antisymmetric carriers), one can suppress the quantum noise in
such a way that its spectrum follows the Standard Quantum Limit (SQL) at low
frequencies. Relaxing this antisymmetry condition, it is also possible to
slightly overcome the SQL in broadband. Combining several such pairs in the
xylophone configuration, it is possible to shape the quantum noise spectrum
flexibly.
