Lieven M. K. Vandersypen, Matthias Breyta, et al.
Nature
The clock synchronization problem is to determine the time difference Δ between two spatially separated clocks. When message delivery times between the two clocks are uncertain, O(22n) classical messages must be exchanged between the clocks to determine n digits of Δ. On the other hand, as we show, there exists a quantum algorithm to obtain n digits of Δ while communicating only O(n) quantum messages. © 2000 The American Physical Society.
Lieven M. K. Vandersypen, Matthias Breyta, et al.
Nature
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