The concept biphoton is important from a fundamental point of view. Although questions regarding fundamental issues of quantum theory still exist, some intriguing characteristics of entangled photon pair makes it particularly suitable for certain practical applications. For example, the biphoton allows performing high-resolution nonlocal correlation measurements in timing and positioning well beyond the classical limit. Moreover, when going through a dispersive medium, the biphoton 2-D wavepacket as a whole gets broadened and not its individual constituents. Such interesting quantum behavior allows nonlocally monitoring, controlling or even canceling the dispersion broadening effect. The ability of performing very accurate distant timing measurements and to control the negative effects due to dispersion has led us to propose a new protocol for distant clock synchronization based on the use of entangled photon pairs. A laboratory proof-of-principle experimental demonstration at UMBC has achieved picoseconds accuracy of distant clock synchronization for two clocks separated by 3km. This experiment has attracted a great deal of attention in the physics and engineering community (Nature, Science News, AiP Bulletin, Laser Focus World) and has made us popular at UMBC.
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Quantum Optics Group
