scholarly journals Study of acceleration measurement in gravitational wave detection

2022 ◽  
Author(s):  
Junlang Li ◽  
Teng Zhang
Keyword(s):  
Gravitational Waves ◽  
Radiation Pressure ◽  
Noise Suppression ◽  
Low Frequency ◽  
Quantum Limit ◽  
Acceleration Measurement ◽  
Standard Quantum ◽  
Standard Quantum Limit ◽  
Wave Detection ◽  
Speed Measurement

Abstract 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.

scholarly journals Proposal for gravitational-wave detection beyond the standard quantum limit through EPR entanglement

2017 ◽  
Vol 13 (8) ◽  
pp. 776-780 ◽  
Author(s):  
Yiqiu Ma ◽  
Haixing Miao ◽  
Belinda Heyun Pang ◽  
Matthew Evans ◽  
Chunnong Zhao ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Quantum Limit ◽  
Standard Quantum ◽  
Standard Quantum Limit ◽  
Gravitational Wave Detection ◽  
Wave Detection

Quantum measurement

Quantum 20/20 ◽  
2019 ◽  
pp. 181-200
Author(s):  
Ian R. Kenyon
Keyword(s):  
Gravitational Waves ◽  
Quantum Measurement ◽  
Input Port ◽  
Quantum Limit ◽  
Photon Flux ◽  
Standard Quantum ◽  
Standard Quantum Limit ◽  
Back Action

Heisenberg’s back action and Robertson’s intrinsic uncertainty are presented. von Neumann’s analysis of quantum measurement is recounted. Advanced LIGO is used as an example of quantum measurement: giant Michelson interferometers achieve sensitivity to motion of 1 part in 1021. The discovery at LIGO of gravitational waves is outlined. Then the standard quantum limit is deduced. The use of cavities in the interferometer arms to increase the photon flux is described. The potential for improvement by squeezing the vacuum at the blank input port is discussed. Prospects for speed interferometry are outlined.

scholarly journals Entanglement-enhanced matter-wave interferometry in a high-finesse cavity

2021 ◽  
Author(s):  
James Thompson ◽  
Graham Greve ◽  
Chengyi Luo ◽  
Baochen Wu
Keyword(s):  
Cavity Qed ◽  
Degrees Of Freedom ◽  
Inertial Sensors ◽  
Mean Field ◽  
New Physics ◽  
Matter Wave ◽  
Quantum Limit ◽  
Entangled State ◽  
Standard Quantum ◽  
Standard Quantum Limit

Abstract Entanglement is a fundamental resource that allows quantum sensors to surpass the standard quantum limit set by the quantum collapse of independent atoms. Collective cavity-QED systems have succeeded in generating large amounts of directly observed entanglement involving the internal degrees of freedom of laser-cooled atomic ensembles. Here we demonstrate cavity-QED entanglement of external degrees of freedom to realize a matter-wave interferometer of 700 atoms in which each individual atom falls freely under gravity and simultaneously traverses two paths through space while also entangled with the other atoms. We demonstrate both quantum non-demolition measurements and cavity-mediated spin interactions for generating squeezed momentum states with directly observed metrological gain 3.4^{+1.1}_{-0.9} dB and 2.5^{+0.6}_{-0.6} dB below the standard quantum limit respectively. An entangled state is for the first time successfully injected into a Mach-Zehnder light-pulse interferometer with 1.7^{+0.5}_{-0.5} dB of directly observed metrological enhancement. These results open a new path for combining particle delocalization and entanglement for inertial sensors, searches for new physics, particles, and fields, future advanced gravitational wave detectors, and accessing beyond mean-field quantum many-body physics.

Sign in / Sign up

Export Citation Format

Share Document