Quantum Improvement of Time Transfer between Remote Clocks

Brahim Lamine, Claude Fabre, and Nicolas Treps
Phys. Rev. Lett. 101, 123601 – Published 18 September 2008

Abstract

Exchanging light pulses to perform accurate space-time positioning is a paradigmatic issue of physics. It is ultimately limited by the quantum nature of light, which introduces fluctuations in the optical measurements and leads to the so-called standard quantum limit (SQL). We propose a new scheme combining homodyne detection and mode-locked femtosecond lasers that lead to a new SQL in time transfer, potentially reaching the yoctosecond range (10211024s). We demonstrate that this already very low SQL can be overcome using appropriately multimode squeezed light. Benefitting from the large number of photons and from the optimal choice of both the detection strategy and of the quantum resource, the proposed scheme represents a significant potential improvement in space-time positioning.

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  • Received 7 April 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.123601

©2008 American Physical Society

Authors & Affiliations

Brahim Lamine*, Claude Fabre, and Nicolas Treps

  • Laboratoire Kastler Brossel, Université Pierre et Marie Curie-Paris 6, ENS, CNRS; 4 place Jussieu, 75252 Paris, France

  • *brahim.lamine@spectro.jussieu.fr

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Issue

Vol. 101, Iss. 12 — 19 September 2008

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