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Sub-Shot-Noise Laser Phase Stabilization via Cavity-Coupled Mach–Zehnder Interferometer

delete2026-08-10
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PRE
AI
N
Nanjing Jiao
R
Ruixin Li
B
Bingnan An
J
Junyang Liu
S
Shaoping Shi
L
Lirong Chen
王
王雅君 (Yajun Wang) *
Y
Yaohui Zheng *
DOI：10.1002/lpor.71684delete
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Abstract

Abstract

En 中文
Laser phase noise fundamentally limits precision across modern optics applications. Existing stabilization protocols suffer a fundamental trade-off: they are constrained by either shot noise or technical noise, and none simultaneously eliminate amplitude noise while preserving quantum enhancement. We overcome this limitation by injecting squeezed vacuum into a cavity-coupled Mach–Zehnder interferometer, thereby realizing sub-shot-noise phase stabilization with intrinsic immunity to amplitude noise—enabled by the high common-mode rejection ratio of balanced detection. With –11 dB squeezing, we achieve 6.2 dB quantum-enhanced suppression at 30 kHz over 5–200 kHz. This architecture provides a practical path to quantum-compatible feedback for next-generation ultra-stable lasers.
Keywords:
cavity-coupled Mach–Zehnder interferometer
laser phase stabilization
sub-shot-noise

Journal

L
Laser & Photonics Reviews
IF:
10
Papers:
1.1K
Citations:
1

Organization

S
Shanxi University
Scholars:
1.2W
Papers: 8.2K
Citations: 1.2W
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