Squeezed-vacuum injection: 3-dB shot-noise reduction below SQL in LIGO

Layer 1 — Physicsin the quantum-sensing subtree

Caves 1981 proposal: inject a squeezed-vacuum state at the dark-port of a Michelson-interferometric gravity-wave detector such that the phase-quadrature fluctuation — that couples to the signal — is suppressed below vacuum (Δφ ∝ e^{−r}/√N)…

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