A novel thermal light based scheme utilizing the second-order coherence is proposed for ultra-high accuracy synchronization of two distant clocks. By using two-photon absorption, which involves an almost simultaneous absorption of two photons within a maximum delay given by the Heisenberg principle, the second-order coherence at a femtosecond scale for a real thermal source has been observed (BOITIER F. et al., Nature Physics 5(4), 2009, p. 267). We show that the clock synchronization accuracy can achieve, in principle, a femtosecond range. And the scheme can be realized with currently available technology, at least for a proof of principle.
展开▼
机译：提出了一种利用二阶相干性的基于热光的新颖方案，用于两个遥遥时钟的超高精度同步。通过使用两个光子吸收，这涉及在Heisenberg原理给定的最大延迟内几乎同时吸收两个光子，已观察到飞秒级的真实热源具有二阶相干性（BOITIER F. ，自然物理学5（4），2009，第267页）。我们证明，时钟同步精度原则上可以达到飞秒范围。并且至少可以从原理上证明，该方案可以利用当前可用的技术来实现。
展开▼
