A pi/4-detuned amplifier cavity that rotates optical quadratures by pi/2 per round trip can amplify gravitational-wave signals without accumulating parametric gain, yielding broadband quantum-noise reduction equivalent to 1/tau^2 more power.
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2026 1verdicts
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Cyclic-Quadrature Intracavity Signal Amplification for Gravitational-Wave Detectors
A pi/4-detuned amplifier cavity that rotates optical quadratures by pi/2 per round trip can amplify gravitational-wave signals without accumulating parametric gain, yielding broadband quantum-noise reduction equivalent to 1/tau^2 more power.