Nondegenerate internal squeezing: an all-optical, loss-resistant quantum technique for gravitational-wave detection

TL;DR

This paper proposes a novel all-optical internal squeezing technique for gravitational-wave detectors that enhances sensitivity at kilohertz frequencies and is resilient to optical losses, potentially improving detection capabilities.

Contribution

It introduces a nondegenerate internal squeezing method using optical parametric oscillation inside the signal-recycling cavity, demonstrating its stability and loss tolerance for broadband sensitivity enhancement.

Findings

Technique is tolerant to optical detection loss.

Analytic Hamiltonian model confirms stability.

Feasible for broadband sensitivity improvement.

Abstract

The detection of kilohertz-band gravitational waves promises discoveries in astrophysics, exotic matter, and cosmology. To improve the kilohertz quantum noise-limited sensitivity of interferometric gravitational-wave detectors, we investigate nondegenerate internal squeezing: optical parametric oscillation inside the signal-recycling cavity with distinct signal-mode and idler-mode frequencies. We use an analytic Hamiltonian model to show that this stable, all-optical technique is tolerant to decoherence from optical detection loss and that it, with its optimal readout scheme, is feasible for broadband sensitivity enhancement.