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Simultaneous speedmeter and position-meter response in a single tabletop interferometer
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DOI：10.1088/1361-6382/ae60bf.png)
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Abstract
En 中文
Quantum radiation-pressure noise (QRPN) limits the low-frequency sensitivity of gravitational wave detectors. The established method for suppressing QRPN is the injection of frequency-dependent squeezed light. It requires long-baseline filter cavities introducing substantial experimental complexity. A completely different interferometer concept is the speedmeter. It avoids QRPN at the source by measuring test mass speed instead of position. While extensively researched theoretically, speedmeters are yet to be demonstrated with a moving test mass in an optomechanical setting. In this work, we present the first experimental observation of speedmeter optomechanical response in a table-top system with a movable test mass. We realize a novel hybrid readout cavity configuration that enables simultaneous extraction of position and speed signals from two distinct output ports. By comparing the corresponding optical transfer functions, we observe the characteristic scaling behavior that distinguishes a speedmeter from a position meter. We support these measurements with a detailed theoretical model, showing how the hybrid readout cavity implements key speedmeter features. While the present experiment does not demonstrate QRPN-limited sensitivity or direct suppression of quantum back-action, it establishes a proof-of-principle platform for further experimental studies of speedmeter concepts relevant to future gravitational-wave detectors.
Keywords:
speedmeter
gravitational-wave detection
quantum noise
quantum optics
interferometry
laser light
quantum optomechanics
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