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Quantum expander for gravitational-wave observatories.

Mikhail Korobko1, Yiqiu Ma2, Yanbei Chen2

  • 11Institut für Laserphysik und Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.

Light, Science & Applications
|December 17, 2019
PubMed
Summary
This summary is machine-generated.

Scientists developed a new optical method to expand the detection bandwidth of gravitational-wave observatories. This technique uses quantum uncertainty squeezing to improve sensitivity for detecting high-frequency signals from cosmic events.

Keywords:
Nonlinear opticsOptical metrologyQuantum optics

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Area of Science:

  • Quantum Optics
  • Gravitational-Wave Astronomy
  • Metrology

Background:

  • Quantum uncertainty in laser light inherently limits the sensitivity of current gravitational-wave detectors.
  • Existing methods like quantum squeezing and optical resonators have limitations, particularly in resolving high-frequency signals from compact-binary merger ring-downs due to finite resonator linewidths.

Purpose of the Study:

  • To propose a novel, purely optical approach to overcome the bandwidth limitations of current gravitational-wave detection techniques.
  • To enhance the sensitivity of future gravitational-wave detectors by expanding their detection bandwidth.

Main Methods:

  • Implementation of quantum uncertainty squeezing within an optical resonator.
  • This method aims to compensate for the finite linewidths of resonators without compromising low-frequency sensitivity.

Main Results:

  • The proposed 'quantum expander' effectively broadens the detection bandwidth.
  • It maintains high sensitivity at low frequencies while enabling the resolution of higher signal frequencies.

Conclusions:

  • The developed quantum expander offers a significant advancement for future gravitational-wave observatories.
  • This technique holds potential for application in other cavity-enhanced metrological experiments requiring enhanced sensitivity and bandwidth.