Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:1411.6289 · Nature Physics

Generation of a squeezed state of an oscillator by stroboscopic back-action-evading measurement

Georgios Vasilakis, Heng Shen, Kasper Jensen, M. V. Balabas, D. Salart, Bokai Chen, Eugene Simon Polzik

Published Mar 30, 2015• 126 citations
arXivHTMLPDF
DOI
10.1038/nphys3280

Related papers

Results of measurement on a harmonic oscillator using a back-action-evading scheme.

F. Fuligni, V. Iafolla

The Ninth Marcel Grossmann Meeting•Jan 1, 1983•2 citations

Generation of a squeezed oscillator via collisions

Hai-Woong Lee

Physics Letters A•Mar 1, 1991•4 citations

Quantum nondemolition measurement by pulsed oscillation

Guiying Zhang, Kai-Feng Zhao

Paramagnetic Faraday rotation is a quantum nondemolition measurement method that can generate spin squeezing and improve the measurement precision of a collective spin component beyond the standard quantum limit. In practice, a constant bias magnetic field is used to drive the spin precessing at sufficiently high frequency in order to lift the signal out of low-frequency technical noises. However, continuous measurement of precessing spins introduces back-action noise (BAN) due to the light-shift effect. Two types of back-action-evading (BAE) measurement of collective spin components have been demonstrated recently: continuous measurement of a two-ensemble system and stroboscopic measurement of a single ensemble. Here we propose another single ensemble BAE measurement by periodically modulating the bias field with $\ensuremath{\pi}$ pulses. Our theoretical calculation shows that under experimental settings where pulse-field modulation does not introduce significant decoherences, the proposed method can suppress the BAN and generate spin squeezing faster than the stroboscopic one at the same probe light power. Moreover, if it is combined with synchronous stroboscopic probing, light-shift BAN can be completely eliminated.

Physical Review A•Mar 22, 2016•3 citations

Generation and detection of squeezed state

Xu-dong Shang, Li Yu, Xue-dong Feng +1 more

Optoelectronics Letters•May 1, 2008•1 citation

Phase-Sensitive Detection and the Back-Action Evasion of Amplifier Force Noise (Measurement Theory, Transducers, Antenna, Gravitational Radiation, Accelerometer).

Gary W. Spetz

Limitations on the sensitivity for detecting a weak classical force acting on a harmonic oscillator are imposed by the quantum mechanical properties associated with a "standard" amplitude-and-phase measurement and, classically, by the back reaction noise associated with the finite noise temperature of the amplifier used to process the measurement. These are known as the "standard quantum limit" and the "standard amplifier limit", respectively. We present the theoretical motivation behind the quest to circumvent these limits, and examine a single-transducer back-action evading measurement scheme designed to perform a phase-sensitive coupling to the oscillator, with the concomitant circumvention of the standard amplifier limit via the "squeezing" of amplifier back reaction noise. The applicability of squeezing in the detection of gravitational radiation is explored via the dependence of detection sensitivity on the physical temperature and quality factor of the resonant-bar gravitational radiation antenna, on the noise temperature of the amplifier, and on the squeezing factor of the back-action evading measurement; the success of back-action evasion in improving upon the optimum amplitude-and-phase detection sensitivities depends critically upon these parameters. Using the LSU superconducting dual-cavity accelerometer as a test platform, we present direct evidence for the establishment of a phase-sensitive coupling to an oscillator, along with a variety of indirect corroborating evidence. This data indicates that our phase-sensitive measurement scheme is indeed more sensitive to one component of the oscillator than to the other component. We also present the first evidence for the existence of back-action evasion of amplifier back reaction noise. We show theoretical expectations and experimental results for the dependence of squeezing on: input signal phases, amplitudes, and frequencies; amplifier back reaction levels; background noise; mechanical oscillator frequency; and coherent carrier contribution at the cavity resonance frequency. Squeezing factors of up to fifteen were achieved by our back-action evading measurement scheme.

Civil War Book Review•Jan 1, 1985•0 citations

Linear quantum control of mechanical motion

Warwick P. Bowen

Building on Chapters 3 and 4, this chapter introduces the concepts of measurement-based quantum control of mechanical systems in the linearised approximation for the optomechanical interaction, including techniques such as feedback cooling and back-action evading measurements using both stroboscopic optical driving and parametric mechanical driving. To model these techniques we introduce the stochastic master equation approach. We then discuss the application of squeezed light fields and ponderomotive optical squeezing to overcome the standard quantum limit introduced in Chapter 3. These methods are important both to improve the precision of quantum sensors and for quantum state tomography of mechanical systems.

CRC Press eBooks•Nov 18, 2015•0 citations
Paramagnetic Faraday rotation is a quantum nondemolition measurement method that can generate spin squeezing and improve the measurement precision of a collective spin component beyond the standard quantum limit. In practice, a constant bias magnetic field is used to drive the spin precessing at sufficiently high frequency in order to lift the signal out of low-frequency technical noises. However, continuous measurement of precessing spins introduces back-action noise (BAN) due to the light-shift effect. Two types of back-action-evading (BAE) measurement of collective spin components have been demonstrated recently: continuous measurement of a two-ensemble system and stroboscopic measurement of a single ensemble. Here we propose another single ensemble BAE measurement by periodically modulating the bias field with $\ensuremath{\pi}$ pulses. Our theoretical calculation shows that under experimental settings where pulse-field modulation does not introduce significant decoherences, the proposed method can suppress the BAN and generate spin squeezing faster than the stroboscopic one at the same probe light power. Moreover, if it is combined with synchronous stroboscopic probing, light-shift BAN can be completely eliminated.
Limitations on the sensitivity for detecting a weak classical force acting on a harmonic oscillator are imposed by the quantum mechanical properties associated with a "standard" amplitude-and-phase measurement and, classically, by the back reaction noise associated with the finite noise temperature of the amplifier used to process the measurement. These are known as the "standard quantum limit" and the "standard amplifier limit", respectively. We present the theoretical motivation behind the quest to circumvent these limits, and examine a single-transducer back-action evading measurement scheme designed to perform a phase-sensitive coupling to the oscillator, with the concomitant circumvention of the standard amplifier limit via the "squeezing" of amplifier back reaction noise. The applicability of squeezing in the detection of gravitational radiation is explored via the dependence of detection sensitivity on the physical temperature and quality factor of the resonant-bar gravitational radiation antenna, on the noise temperature of the amplifier, and on the squeezing factor of the back-action evading measurement; the success of back-action evasion in improving upon the optimum amplitude-and-phase detection sensitivities depends critically upon these parameters. Using the LSU superconducting dual-cavity accelerometer as a test platform, we present direct evidence for the establishment of a phase-sensitive coupling to an oscillator, along with a variety of indirect corroborating evidence. This data indicates that our phase-sensitive measurement scheme is indeed more sensitive to one component of the oscillator than to the other component. We also present the first evidence for the existence of back-action evasion of amplifier back reaction noise. We show theoretical expectations and experimental results for the dependence of squeezing on: input signal phases, amplitudes, and frequencies; amplifier back reaction levels; background noise; mechanical oscillator frequency; and coherent carrier contribution at the cavity resonance frequency. Squeezing factors of up to fifteen were achieved by our back-action evading measurement scheme.
Building on Chapters 3 and 4, this chapter introduces the concepts of measurement-based quantum control of mechanical systems in the linearised approximation for the optomechanical interaction, including techniques such as feedback cooling and back-action evading measurements using both stroboscopic optical driving and parametric mechanical driving. To model these techniques we introduce the stochastic master equation approach. We then discuss the application of squeezed light fields and ponderomotive optical squeezing to overcome the standard quantum limit introduced in Chapter 3. These methods are important both to improve the precision of quantum sensors and for quantum state tomography of mechanical systems.