Caleb Ho et al 2009 New J. Phys. 11 045011 doi:10.1088/1367-2630/11/4/045011
Clock synchronization by remote detection of correlated photon pairs
Quantum Cryptography: Theory and PracticeCaleb Ho1, Antía Lamas-Linares1,2 and Christian Kurtsiefer1,2,3
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In this study, we present an algorithm to detect the time and frequency differences of independent clocks based on observation of time-correlated photon pairs. This enables remote coincidence identification in entanglement-based quantum key distribution schemes without dedicated coincidence hardware, pulsed sources with a timing structure or very stable reference clocks. We discuss the method for typical operating conditions and show that the requirement for reference clock accuracy can be relaxed by about five orders of magnitude in comparison with previous schemes.
- PACS
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03.67.Dd Quantum cryptography and communication security
03.67.Mn Entanglement measures, witnesses, and other characterizations
42.50.Dv Quantum state engineering and measurements
42.65.Lm Parametric down conversion and production of entangled photons
- Subjects
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Instrumentation and measurement
- Dates
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Issue 4 (April 2009)
Received 21 January 2009
Published 30 April 2009
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Clock synchronization by remote detection of correlated photon pairs
Caleb Ho et al 2009 New J. Phys. 11 045011
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Limits of renormalizable polynomials
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