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arXiv · 2008.04360

A two-carrier scheme: evading the 3dB quantum penalty of heterodyne readout in gravitational-wave detectors

Teng Zhang·Philip Jones·Jiří Smetana·Haixing Miao·Denis Martynov·Andreas Freise·Stefan W. Ballmer
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Abstract

Precision measurements using traditional heterodyne readout suffer a 3dB quantum noise penalty compared with homodyne readout. The extra noise is caused by the quantum fluctuations in the image vacuum. We propose a two-carrier gravitational-wave detector design that evades the 3dB quantum penalty of heterodyne readout. We further propose a new way of realising frequency-dependent squeezing utilising two-mode squeezing in our scheme. It naturally achieves more precise audio frequency signal measurements with radio frequency squeezing. In addition, the detector is compatible with other quantum nondemolition techniques.

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Teng Zhang, Philip Jones, Jiří Smetana, Haixing Miao, Denis Martynov, Andreas Freise, Stefan W. Ballmer. 2021-05-15. A two-carrier scheme: evading the 3dB quantum penalty of heterodyne readout in gravitational-wave detectors. https://doi.org/10.1103/physrevlett.126.221301

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