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Phys. Rev. A 70, 043808 (2004) [8 pages]

Conveyor-belt clock synchronization

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Vittorio Giovannetti1,*, Seth Lloyd1,2, Lorenzo Maccone1,†, Jeffrey H. Shapiro1, and Franco N. C. Wong1
1Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA
2Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA

Received 26 May 2004; published 12 October 2004

A protocol for synchronizing distant clocks is proposed that does not rely on the arrival times of the signals which are exchanged, and an optical implementation based on coherent-state pulses is described. This protocol is not limited by any dispersion that may be present in the propagation medium through which the light signals are exchanged. Possible improvements deriving from the use of quantum-mechanical effects are also addressed.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.043808
DOI:
10.1103/PhysRevA.70.043808
PACS:
42.50.−p, 03.65.Ta, 06.30.Ft, 89.70.+c

*Present address: NEST-INFM & Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126, Pisa, Italy.

†Present address: QUIT—Quantum Information Theory Group Dipartimento di Fisica “A. Volta,” Università di Pavia, via A. Bassi 6, I-27100, Pavia, Italy.

 
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