A quantum network of clocks

• Published in: arXiv.org
• Main Authors: Kómár, Peter, Kessler, Eric M, Bishof, Michael, Jiang, Liang, Sørensen, Anders S, Ye, Jun, Lukin, Mikhail D
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 22.10.2013
• Subjects: Atomic clocks; Clocks & watches; Entangled states; Global positioning systems; GPS; Physics - Quantum Physics; Quantum theory; Satellite navigation systems
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1310.6045

The development of precise atomic clocks has led to many scientific and technological advances that play an increasingly important role in modern society. Shared timing information constitutes a key resource for positioning and navigation with a direct correspondence between timing accuracy and precision in applications such as the Global Positioning System (GPS). By combining precision metrology and quantum networks, we propose here a quantum, cooperative protocol for the operation of a network consisting of geographically remote optical atomic clocks. Using non-local entangled states, we demonstrate an optimal utilization of the global network resources, and show that such a network can be operated near the fundamental limit set by quantum theory yielding an ultra-precise clock signal. Furthermore, the internal structure of the network, combined with basic techniques from quantum communication, guarantees security both from internal and external threats. Realization of such a global quantum network of clocks may allow construction of a real-time single international time scale (world clock) with unprecedented stability and accuracy.