Quantum noise cancellation in asymmetric speed metres with balanced homodyne readout

Zhang, Teng; Knyazev, E.; Steinlechner, S.; Khalili, F. Y.; Barr, B.; Bell, A. S.; Dupej, P.; Briggs, J. H.; Gräf, Christian; Callaghan, J. D.; Hennig, J.; Houston, E. A.; Huttner, S. H.; Leavey, S.; Pascucci, D.; Sorazu, B.; Spencer, A. P.; Wright, J. L.; Strain, K. A.; Hild, S.; Danilishin, S.

doi:10.1088/1367-2630/aae86e

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…Asymmetry of the beam splitter in Sagnac interferometers, for instance, creates a coupling of laser fluctuations to the readout port through an excess radiation pressure they create on the mirrors which is quite strong as laser noise in the low-frequency range is far from the shot noise limit. This excess noise, however can be cancelled by a wise choice of local oscillator in the balanced homodyne readout as shown in the recent study by Zhang et al [84].…”

Section: Imperfections and Loss In Speed-meter Interferometersmentioning

confidence: 98%

Advanced quantum techniques for future gravitational-wave detectors

2019

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Quantum fluctuation of light limits the sensitivity of advanced laser interferometric gravitational-wave detectors. It is one of the principal obstacles on the way towards the next-generation gravitational-wave observatories. The envisioned significant improvement of the detector sensitivity requires using quantum non-demolition measurement and back-action evasion techniques, which allow us to circumvent the sensitivity limit imposed by the Heisenberg uncertainty principle. In our previous review article: "Quantum measurement theory in gravitationalwave detectors" [Living Rev. Relativity 15, 5 (2012)], we laid down the basic principles of quantum measurement theory and provided the framework for analysing the quantum noise of interferometers. The scope of this paper is to review novel techniques for quantum noise suppression proposed in the recent years and put them in the same framework. Our delineation of interferometry schemes and topologies is intended as an aid in the process of selecting the design for the next-generation gravitational-wave observatories.Keywords gravitational-wave detectors · optomechanics · quantum measurement theory · quantum noise · standard quantum limit · fundamental quantum limit · optical rigidity · quantum speed meter · squeezed light · back-action evasion · atomic spin ensemble · white-light cavity

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Section: Imperfections and Loss In Speed-meter Interferometersmentioning

confidence: 98%

Advanced quantum techniques for future gravitational-wave detectors

2019

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“…In our design, we implement balanced homodyne readout. For phase quadrature measurement, the photocurrent of general balanced homodyne readout can be written as [31]…”

Section: Interferometer Asymmetrymentioning

confidence: 99%

Enhancing high frequency sensitivity of gravitational wave detectors with sloshing-Sagnac interferometer

Zhang,

Martynov,

Danilishin

et al. 2021

Preprint

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Sensitivity of gravitational-wave detectors is limited in the high-frequency band by quantum shot noise and eventually limited by the optical loss in signal recycling cavity. This limit is the main obstacle on the way to detect gravitational waves from the binary neutron star mergers in the current and the future generation detectors, as it does not depend on either the arm length, or the injected squeezing level. In this paper, we come up with the sloshing Sagnac interferometer topology, which can be obtained from the Michelson interferometer by optically connecting the end mirrors into an additional optical cavity. This transforms the interferometer into a triply-coupled cavity system capable of beating the loss-induced high-frequency limit of the signal-recycled Michelson interferometer. With advanced LIGO+ comparable parameters, a sloshing-Sagnac scheme can achieve 7 times better sensitivity at 2.5 kHz or 4 times better signal to noise ratio for a typical waveform of binary neutron post merge. Being an evolution of Michelson interferometer, the sloshing-Sagnac interferometer can possibly be used as a topology for the future generation detectors and upgrade of current detectors.

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“…Until now there are already several types of proposed speed-meter, such as the sloshing speed-meter [2,12,17,19], Sagnac interferometer [7], polarisation circulation speed-meter [11], and EPR-type speed meters [16]. The relevant study in theory and experiment has also been continued in recent years [10,13,14,20,21]. The radiation pressure noise of gravitational wave detectors comes from the laser radiation pressure force induced mirror displacement.…”

Section: Introductionmentioning

confidence: 99%

Study of acceleration measurement in gravitational wave detection

Zhang

2022

Class. Quantum Grav.

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Position-meter and speed-meter interferometers have been analysed for detecting gravitational waves. Speed-meter is proposed to reduce the radiation pressure noise, which is dominant at low frequency. We introduce the concept of acceleration measurement in comparison with position and speed measurement. In this paper, we describe a general acceleration measurement and derive its standard quantum limit. We provide an example of an acceleration-meter interferometer configuration. We show that shot noise dominates at low frequency following a frequency dependence of $1/\Omega^2$, while radiation pressure noise is constant. The acceleration-meter has even a stronger radiation pressure noise suppression than speed-meter.

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Quantum noise cancellation in asymmetric speed metres with balanced homodyne readout

Abstract: Keywords: balanced homodyne detector, speed metre, quantum noise 7 -, moving the RIN requirement from a value that is hard to achieve in practice, to one which is routinely obtained.

Cited by 7 publications

References 36 publications

Advanced quantum techniques for future gravitational-wave detectors

Advanced quantum techniques for future gravitational-wave detectors

Enhancing high frequency sensitivity of gravitational wave detectors with sloshing-Sagnac interferometer

Study of acceleration measurement in gravitational wave detection

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