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

Physics World

Entangled states boost atomic clocks

Tim Wogan

Published Dec 1, 2024• 0 citations
Publisher

Abstract

Two separate groups have used Greenberger–Horne–Zeilinger states to perform measurements better than the standard quantum limit, as Tim Wogan reports.
DOI
10.1088/2058-7058/37/12/01

Related papers

Generation of three-atom Greenberger–Horne–Zeilinger entangled states based on separate cavities

Peng Xu, Dong Wang, Ye Liu

Optics Communications•Feb 27, 2013•1 citation

Atomic quantum processors make their debut

Tim Wogan

Two research groups demonstrate quantum algorithms using neutral atoms as qubits. Tim Wogan reports.

Physics World•Aug 1, 2022•0 citations

Entanglement enhanced performance of atomic clocks in the presence of environmental noise

Andrew R. Jacobs, James Clemens

Bulletin of the American Physical Society•Mar 31, 2006•0 citations

Heisenberg-Limited Atom Clocks Based on Entangled Qubits

E. M. Kessler, P. Kómár, Michael Bishof +4 more

We present a quantum-enhanced atomic clock protocol based on groups of sequentially larger Greenberger-Horne-Zeilinger (GHZ) states that achieves the best clock stability allowed by quantum theory up to a logarithmic correction. Importantly the protocol is designed to work under realistic conditions where the drift of the phase of the laser interrogating the atoms is the main source of decoherence. The simultaneous interrogation of the laser phase with a cascade of GHZ states realizes an incoherent version of the phase estimation algorithm that enables Heisenberg-limited operation while extending the coherent interrogation time beyond the laser noise limit. We compare and merge the new protocol with existing state of the art interrogation schemes, and identify the precise conditions under which entanglement provides an advantage for clock stabilization: it allows a significant gain in the stability for short averaging time.

arXiv:1310.6043•Physical Review Letters•May 15, 2014•126 citations

Networking atomic clocks via quantum entanglement

Physics Today•Jun 16, 2014•0 citations

Entangled quantum clocks for measuring proper-time difference

Won-Young Hwang, Doyeol Ahn, Sung Woo Hwang +1 more

arXiv:quant-ph/0012003•The European Physical Journal D•Apr 1, 2002•12 citations
We present a quantum-enhanced atomic clock protocol based on groups of sequentially larger Greenberger-Horne-Zeilinger (GHZ) states that achieves the best clock stability allowed by quantum theory up to a logarithmic correction. Importantly the protocol is designed to work under realistic conditions where the drift of the phase of the laser interrogating the atoms is the main source of decoherence. The simultaneous interrogation of the laser phase with a cascade of GHZ states realizes an incoherent version of the phase estimation algorithm that enables Heisenberg-limited operation while extending the coherent interrogation time beyond the laser noise limit. We compare and merge the new protocol with existing state of the art interrogation schemes, and identify the precise conditions under which entanglement provides an advantage for clock stabilization: it allows a significant gain in the stability for short averaging time.