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

Quantum-enhanced metrology with the single-mode coherent states of an optical cavity inside a quantum feedback loop

AM Clark, A Stokes, A Beige

Published Aug 23, 2016• 0 citations
Publisher
DOI
10.25405/ncl.34452942

Related papers

Single-mode quantum metrology enhanced by approximate quantum error correction

Weiting Wang, Zijie Chen, Xinyu Liu +8 more

Bulletin of the American Physical Society•Mar 16, 2021•0 citations

Quantum-enhanced metrology with the single-mode coherent states of an optical cavity inside a quantum feedback loop

Lewis A. Clark, Adam Stokes, Almut Beige

In this paper, we use the nonlinear generator of dynamics of the individual quantum trajectories of an optical cavity inside an instantaneous quantum feedback loop to measure the phase shift between two pathways of light with a precision above the standard quantum limit. The feedback laser provides a reference frame and constantly increases the dependence of the state of the resonator on the unknown phase. Since our quantum metrology scheme can be implemented with current technology and does not require highly efficient single photon detectors, it should be of practical interest until highly entangled many-photon states become more readily available.

arXiv:1512.01497•Physical Review A•Aug 23, 2016•18 citations

Quantum-enhanced metrology with single-mode coherent states

Lewis A. Clark, Adam Stokes, Almut Beige

In this paper, we use the temporal quantum correlations in the photon statistics of an optical cavity inside an instantaneous quantum feedback loop to measure the phase shift between two pathways of light with an accuracy above the standard quantum limit. The feedback laser provides a reference frame and constantly increases the phase space volume occupied by the resonator field, thereby increasing the dependence of its final state on the measured phase. Since our quantum metrology scheme can be implemented with current technology and does not require highly-efficient single photon detectors, it should be of practical interest until technologies for the generation of highly-entangled many-photon states become more readily available.

•Dec 4, 2015•0 citations

Exceptional-point-enhanced quantum metrology in a non-Hermitian quantum coherent system

Xuan Fu, Xuesong Hu, Hancheng Liu +7 more

Optics & Laser Technology•May 16, 2026•0 citations

Optimal two-mode coherent states in lossy quantum-enhanced metrology

Su‐Yong Lee, Yong Sup Ihn, Zaeill Kim

•Jun 12, 2019•1 citation

Quantum-enhanced Metrology without Entanglement based on Optical Cavities with Feedback

Lewis A. Clark, Adam Stokes, Muhammad Mubashir Khan +2 more

There are a number of different strategies to measure the phase shift between two pathways of light more efficiently than suggested by the standard quantum limit. One way is to use highly entangled photons. Another way is to expose photons to a non-linear or interacting Hamiltonian. This paper emphasises that the conditional dynamics of open quantum systems provides an interesting additional tool for quantum-enhanced metrology. As a concrete example, we review a recent scheme which exploits the conditional dynamics of a laser-driven optical cavity with spontaneous photon emission inside a quantum feedback loop. Deducing information from second-order photon correlation measurements requires neither optical non-linearities nor entangled photons and should therefore be of immediate practical interest.

arXiv:1609.02412•International Conference on Photonics, Optics and Laser Technology•Jan 1, 2017•0 citations
In this paper, we use the nonlinear generator of dynamics of the individual quantum trajectories of an optical cavity inside an instantaneous quantum feedback loop to measure the phase shift between two pathways of light with a precision above the standard quantum limit. The feedback laser provides a reference frame and constantly increases the dependence of the state of the resonator on the unknown phase. Since our quantum metrology scheme can be implemented with current technology and does not require highly efficient single photon detectors, it should be of practical interest until highly entangled many-photon states become more readily available.
In this paper, we use the temporal quantum correlations in the photon statistics of an optical cavity inside an instantaneous quantum feedback loop to measure the phase shift between two pathways of light with an accuracy above the standard quantum limit. The feedback laser provides a reference frame and constantly increases the phase space volume occupied by the resonator field, thereby increasing the dependence of its final state on the measured phase. Since our quantum metrology scheme can be implemented with current technology and does not require highly-efficient single photon detectors, it should be of practical interest until technologies for the generation of highly-entangled many-photon states become more readily available.
There are a number of different strategies to measure the phase shift between two pathways of light more efficiently than suggested by the standard quantum limit. One way is to use highly entangled photons. Another way is to expose photons to a non-linear or interacting Hamiltonian. This paper emphasises that the conditional dynamics of open quantum systems provides an interesting additional tool for quantum-enhanced metrology. As a concrete example, we review a recent scheme which exploits the conditional dynamics of a laser-driven optical cavity with spontaneous photon emission inside a quantum feedback loop. Deducing information from second-order photon correlation measurements requires neither optical non-linearities nor entangled photons and should therefore be of immediate practical interest.