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Journal of Hubei University of Technology

Time Synchronization Based on Quantum Nonlocality

Yang Tao

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

A new protocol to synchronize the clocks located on different places is presented.Due to the properties,quantum correlations existing in the entanglement and entanglement state collapse into respective eigenstates instantaneously.It is proved that two spatially separated parties can establish a synchronized pair of time by using shared entanglement and communication.

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Journal of Huangshi Institute of Technology•Jan 1, 2010•0 citations
A new protocol to synchronize the clocks located on different places is presented.Due to the properties,quantum correlations existing in the entanglement and entanglement state collapse into respective eigenstates instantaneously.It is proved that two spatially separated parties can establish a synchronized pair of time by using shared entanglement and communication.
We propose a multiparty quantum clock synchronization protocol that makes optimal use of the maximal multipartite entanglement of GHZ-type states. To realize the protocol, different versions of maximally entangled eigenstates of collective energy are generated by local transformations that distinguish among different groupings of the parties. The maximal sensitivity of the entangled states to time differences between the local clocks can then be accessed if all parties share the results of their local time-dependent measurements. The efficiency of the protocol is evaluated in terms of the statistical errors in the estimation of time differences and the performance of the protocol is compared to alternative protocols proposed previously.
Abstract A major outstanding problem for many quantum clock synchronization protocols is the hidden assumption of a common phase reference between the parties to be synchronized. In general, the definition of the quantum states between two parties do not have consistent phase definitions, which can lead to an unknown systematic error. We show that despite prior arguments to the contrary, it is possible to remove this unknown phase via entanglement purification. This closes the loophole for entanglement based quantum clock synchronization protocols, which is a non-local approach to synchronize two clocks independent of the properties of the intervening medium. Starting with noisy Bell pairs, we show that the scheme produces a singlet state for any combination of (i) differing basis conventions for Alice and Bob; (ii) an overall time offset in the execution of the purification algorithm; and (iii) the presence of a noisy channel. Error estimates reveal that better performance than existing classical Einstein synchronization protocols should be achievable using current technology.