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

Journal of Experimental and Theoretical Physics

Quantum variational force measurement and the cancellation of nonlinear feedback

Sergey P. Vyatchanin, Andrey B. Matsko

Published Jun 1, 1996• 4 citations
OpenAlex

Related papers

The Quantum Variation Measurement of Force and Nonlinear Bak Action Compensation

Andrey B. Matsko, Sergey P. Vyatchanin

European Quantum Electronics Conference (EQEC)•Jan 1, 1996•0 citations

Quantum variation measurement of a force

Sergey P. Vyatchanin, Elena A. Zubova

Physics Letters A•May 1, 1995•107 citations

The estimation of signal force parameters in quantum variation measurement

Sergey P. Vyatchanin

Physics Letters A•Mar 1, 1998•29 citations

Atom-laser coherence via multiloop feedback control

M. Yanagisawa, M. R. James

Coherence control is the key to success in the applications of atom-laser beams. A multiloop measurement feedback control scheme is proposed to improve atom-laser coherence. The first loop aims to cancel the decohering effects of the nonlinear atom-atom interactions via direct measurement feedback. However, there are nonlinear interactions with the optical probe field used in the measurement scheme which may also contribute to a degradation in atom-laser performance. Accordingly, a second feedback loop is used to reduce these effects based on linear quadratic Gaussian control. The multiloop design achieves improved atom-laser coherence.

Physical Review A•Feb 18, 2009•4 citations

Frontiers in quantum feedback control

Hideo Mabuchi

Bulletin of the American Physical Society•Jun 6, 2007•0 citations

Quantum limits on measurement and control of a mechanical oscillator

Vivishek Sudhir

The motion of a macroscopic mechanical oscillator – a glass nanostring – has been measured, using a cavity-enhanced optical interferometer, with a sensitivity that is 40 dB below that at the standard quantum limit, forming the most precise measurement of the zero-point motion of a mechanical oscillator yet. The resulting back-action due to the measurement has been observed. A quantum feedback protocol is used to cancel 20 dB of back-action, in a first instance of quantum feedback applied on a mechanical oscillator. Quantum correlations developed between the oscillator and the measuring instrument – light – has been observed. The role of these correlations in quantum-enhanced metrology of weak forces is illustrated, and feedback is used to manipulate and enhance the same correlations.

Frontiers in Optics•Jan 1, 2017•2 citations
Coherence control is the key to success in the applications of atom-laser beams. A multiloop measurement feedback control scheme is proposed to improve atom-laser coherence. The first loop aims to cancel the decohering effects of the nonlinear atom-atom interactions via direct measurement feedback. However, there are nonlinear interactions with the optical probe field used in the measurement scheme which may also contribute to a degradation in atom-laser performance. Accordingly, a second feedback loop is used to reduce these effects based on linear quadratic Gaussian control. The multiloop design achieves improved atom-laser coherence.
The motion of a macroscopic mechanical oscillator – a glass nanostring – has been measured, using a cavity-enhanced optical interferometer, with a sensitivity that is 40 dB below that at the standard quantum limit, forming the most precise measurement of the zero-point motion of a mechanical oscillator yet. The resulting back-action due to the measurement has been observed. A quantum feedback protocol is used to cancel 20 dB of back-action, in a first instance of quantum feedback applied on a mechanical oscillator. Quantum correlations developed between the oscillator and the measuring instrument – light – has been observed. The role of these correlations in quantum-enhanced metrology of weak forces is illustrated, and feedback is used to manipulate and enhance the same correlations.