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ACTA PHOTONICA SINICA

Efficient Suppression of Laser Excess Noises for Quantum Optomechanical System

Xinya Zhang

Published Jan 1, 2015• 0 citations
OpenAlex

Abstract

The suppression of laser excess noise using a cascaded imbalanced Mach-Zehnder interferometer with fiber optic components was proposed and demonstrated in the experiment.By developing an automatic phase control system,the phase of the fiber interferometer with a large path imbalance(127m)can be stabilized in a long term,and the laser excess noise around 800 kHz and its integer multiples can be efficiently suppressed by more than 45 dB.The effective frequency bands of the noise filter can be controlled by adjusting the arm-length difference of the interferometer.The approach provides an effective solution for achieving compact and cost-effective laser noise reduction,and can be applied directly to the quantum optomechanical system where shot-noise-limited laser can be required.

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The suppression of laser excess noise using a cascaded imbalanced Mach-Zehnder interferometer with fiber optic components was proposed and demonstrated in the experiment.By developing an automatic phase control system,the phase of the fiber interferometer with a large path imbalance(127m)can be stabilized in a long term,and the laser excess noise around 800 kHz and its integer multiples can be efficiently suppressed by more than 45 dB.The effective frequency bands of the noise filter can be controlled by adjusting the arm-length difference of the interferometer.The approach provides an effective solution for achieving compact and cost-effective laser noise reduction,and can be applied directly to the quantum optomechanical system where shot-noise-limited laser can be required.
ABSTRACT 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.
We propose and experimentally demonstrate a quantum-enhanced fiber Mach-Zehnder interferometer for low-frequency phase measurement beyond the shot-noise limit using a high-frequency squeezing technique. The local oscillator field is amplitude-modulated in the MHz range and is then demodulated to avoid the technical noise that occurs at low frequencies. After measurement of the phase noise at a frequency of tens of kHz, an improvement of ∼2 dB relative to the shot-noise level is achieved. Additionally, the amplitude modulation depth has no significant effect on the phase noise improvement of the interferometer when deployed in our experimental configuration. The current scheme introduces a quantum technique into the fiber-based measurements, particularly for the low frequency range, and this scheme has potential applications in the high-precision fiber sensing of temperature, strain, and various other parameters.
An experimental study was carried out on the performance of a feedback stabilization scheme for optical interferometers. Optical interferometers are susceptible to acoustic noise which translates into path length fluctuations in the interferometer arms. These fluctuations induce phase noise, resulting in amplitude fluctuations on the interferometer output. The experiment was performed on a Mach-Zehnder homodyne interferometer where a RMS noise reduction of 23 dB was observed. The stabilization scheme has application to other interferometer configurations. In the future, it will be applied to stabilize cavities used in the squeezed state generation of light. (Author)
We experimentally demonstrate stable and user-adjustable single-photon interference in a 1 km long fiber-optic Mach-Zehnder interferometer, using an active phase control system with the feedback provided by a classical laser. We are able to continuously tune the single-photon phase difference between the interferometer arms using a phase modulator, which is synchronized with the gate window of the single-photon detectors. The phase control system employs a piezoelectric fiber stretcher to stabilize the phase drift in the interferometer. A single-photon net visibility of 0.97 is obtained, yielding future possibilities for experimental realizations of quantum repeaters in optical fibers and violation of Bell's inequalities using genuine energy-time entanglement.
High-stability single-frequency fiber lasers typically exhibit relative intensity noise that is far in excess of shot noise across a broad frequency range extending from dc to many tens of megahertz. This excess noise precludes the use of these fiber lasers in a range of precision interferometry and quantum optics applications. We present experimental results using a passive, highQ, fiber ring resonator to filter out up to 26 dB of excess laser intensity noise, resulting in a stabilized laser output that reaches the shot-noise limit over most of its signal spectrum.
Fiber-optic Mach-Zehnder interferometers are widely used in research areas such as telecommunications, spectroscopy, and quantum information. These optical structures are known to be affected by phase fluctuations that are usually modeled as multiparametric noise.This multidimensional noise must be stabilized or compensated for to enable fiber-optic Mach-Zehnder architectures for practical applications. In this work, we study the effectiveness of a modified Perturb-and-Observe (P&O) algorithm to control multidimensional phase noise in fiber-based multi-arm Mach-Zehnder interferometers. We demonstrate the feasibility of stabilizing multidimensional phase noise by numerical simulations using a simple feedback control scheme and analyze the algorithm’s performance for systems up to dimension 8x8. We achieved minimal steady-state errors that guarantee high optical visibility in complex optical systems with N×N matrices (with N=[2,3,4,5,6,7,8]).