Coherent feedback for quantum expander in gravitational wave observatories
Abstract: The observation of gravitational waves from binary neutron star mergers offers insights into properties of extreme nuclear matter. However, their high-frequency signals in the kHz range are often masked by quantum noise of the laser light used. Here, we propose the "quantum expander with coherent feedback", a new detector design that features an additional optical cavity in the detector output and an internal squeeze operation. This approach allows to boost the sensitivity at high frequencies, at the same time providing a compact and tunable design for signal extraction. It allows to tailor the sensitivity of the detector to the specific signal frequency range. We demonstrate that our design allows to improve the sensitivity of the high-frequency detector concept NEMO (neutron star extreme matter observatory), increasing the detection rates by around 15%. Our approach promises new level of flexibility in designing the detectors aiming at high-frequency signals.
- B. Abbott et al., Observation of gravitational waves from a binary black hole merger, Physical Review Letters 116, 10.1103/physrevlett.116.061102 (2016).
- B. P. Abbott et al., GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral, Physical Review Letters 119, 161101 (2017).
- B. P. Abbott et al., GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs, Physical Review X 9, 031040 (2019), arXiv: 1811.12907.
- LIGO Scientific Collaboration, Advanced LIGO, Classical and Quantum Gravity 32, 74001 (2015).
- A. Bauswein and H. T. Janka, Measuring neutron-star properties via gravitational waves from neutron-star mergers, Physical Review Letters 108, 1 (2012), arXiv: 1106.1616.
- I. Harry and T. Hinderer, Observing and measuring the neutron-star equation-of-state in spinning binary neutron star systems, Classical and Quantum Gravity 35, 145010 (2018).
- L. Baiotti and L. Rezzolla, Binary neutron star mergers: a review of einstein’s richest laboratory, Reports on Progress in Physics 80, 096901 (2017).
- R. S. Conklin, B. Holdom, and J. Ren, Gravitational wave echoes through new windows, Physical Review D 98, 10.1103/physrevd.98.044021 (2018).
- R. Schnabel, Squeezed states of light and their applications in laser interferometers, Physics Reports 684, 1 (2017).
- K. Ackley et al., Neutron star extreme matter observatory: A kilohertz-band gravitational-wave detector in the global network, Publications of the Astronomical Society of Australia 37, 10.1017/pasa.2020.39 (2020).
- Y. Chen, Macroscopic quantum mechanics: Theory and experimental concepts of optomechanics, Journal of Physics B: Atomic, Molecular and Optical Physics 46, 104001 (2013), arXiv: 1302.1924.
- A. Buonanno and Y. Chen, Scaling law in signal recycled laser-interferometer gravitational-wave detectors, Physical Review D 67, 10.1103/physrevd.67.062002 (2003).
- M. Korobko, Taming the quantum noise: How quantum metrology can expand the reach of gravitational-wave observatories, Ph.D. thesis, University of Hamburg (2020).
- C. M. Caves and B. L. Schumaker, New formalism for two-photon quantum optics. I. Quadrature phases and squeezed states, Physical Review A 31, 3068 (1985).
- V. B. Braginsky and F. Khalilli, Quantum Measurement (Cambridge University Press, 1992).
- D. Walls, Squeezed states of light, Nature 306 (1983).
- F. Khalili, Reducing the mirrors coating noise in laser gravitational-wave antennae by means of double mirrors, Physics Letters A 334, 67–72 (2005).
- V. B. Braginsky, M. L. Gorodetsky, and F. Y. Khalili, Optical bars in gravitational wave antennas, Physics Letters A 232, 340 (1997).
- A. Buonanno and Y. Chen, Laser-interferometer gravitational-wave optical-spring detectors, Classical and Quantum Gravity 19, 1569–1574 (2002).
- M. Korobko, F. Khalili, and R. Schnabel, Engineering the optical spring via intra-cavity optical-parametric amplification, Physics Letters A 382, 2238–2244 (2018).
- H. Miao, N. D. Smith, and M. Evans, Quantum limit for laser interferometric gravitational-wave detectors from optical dissipation, Physical Review X 9, 10.1103/physrevx.9.011053 (2019).
- H. Miao, H. Yang, and D. Martynov, Towards the design of gravitational-wave detectors for probing neutron-star physics, Physical Review D 98, 10.1103/physrevd.98.044044 (2018).
- A. Bauswein, N. Stergioulas, and H.-T. Janka, Exploring properties of high-density matter through remnants of neutron-star mergers, The European Physical Journal A 52, 10.1140/epja/i2016-16056-7 (2016).
- E. Nichols and G. Hull, The pressure due to radiation, Astrophysical Journal 17, 315 (1903).
- M. Rakhmanov, J. D. Romano, and J. T. Whelan, High-frequency corrections to the detector response and their effect on searches for gravitational waves, Classical and Quantum Gravity 25, 184017 (2008).
Paper Prompts
Sign up for free to create and run prompts on this paper using GPT-5.
Top Community Prompts
Collections
Sign up for free to add this paper to one or more collections.