Heisenberg-limited atom clocks based on entangled qubits
Quantum Physics
2014-05-29 v1
Abstract
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.
Cite
@article{arxiv.1310.6043,
title = {Heisenberg-limited atom clocks based on entangled qubits},
author = {Eric M. Kessler and Peter Kómár and Michael Bishof and Liang Jiang and Anders S. Sørensen and Jun Ye and Mikhail D. Lukin},
journal= {arXiv preprint arXiv:1310.6043},
year = {2014}
}
Comments
13 pages, 2 figures