Heisenberg-limited atom clocks based on entangled qubits

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. The simultaneous interrogation of the laser phase with such a cascade...

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Bibliographic Details
Published inarXiv.org
Main Authors Kessler, Eric M, Kómár, Peter, Bishof, Michael, Jiang, Liang, Sørensen, Anders S, Ye, Jun, Lukin, Mikhail D
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 22.10.2013
Subjects
Algorithms
Atomic clocks
Interrogation
Physics - Quantum Physics
Quantum entanglement
Quantum theory
Qubits (quantum computing)
Questioning
Stability
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Summary: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. The simultaneous interrogation of the laser phase with such a cascade of GHZ states realizes an incoherent version of the phase estimation algorithm that enables Heisenberg-limited operation while extending the Ramsey interrogation time beyond the laser noise limit. We compare the new protocol with state of the art interrogation schemes, and show that entanglement allow a significant quantum gain in the stability for short averaging time.
ISSN:2331-8422
DOI:10.48550/arxiv.1310.6043