All-optical link for direct comparison of distant optical clocks

All-optical link for direct comparison of distant optical clocks.

We developed an all-optical link system for making remote comparisons of two distant ultra-stable optical clocks. An optical carrier transfer system based on a fiber interferometer was employed to compensate the phase noise accumulated during the propagation through a fiber link. Transfer stabilities of 2 × 10(-15) at 1 second and 4 × 10(-18) at 1000 seconds were achieved in a 90-km link. An ac...

Synchronization of Distant Optical Clocks at the Femtosecond Level

The use of optical clocks or oscillators in future ultraprecise navigation, gravitational sensing, coherent arrays, and relativity experiments will require time comparison and synchronization over terrestrial or satellite free-space links. Here, we demonstrate full unambiguous synchronization of two optical time scales across a free-space link. The time deviation between synchronized time scale...

A novel absorption resonance for all-optical atomic clocks

Sergei Zibrov, 2, 3, 4 Irina Novikova, David F. Phillips, Aleksei V. Taichenachev, Valeriy I. Yudin, Ronald L. Walsworth, 4 and Alexander S. Zibrov 3, 4 Department of Physics, Harvard University, Cambridge, Massachusetts, 02138 Moscow State Engineering Physics Institute, Moscow, 115409, Russia Lebedev Institute of Physics, Moscow, 117924, Russia Harvard-Smithsonian Center for Astrophysics, Camb...

Optical lattice clocks and frequency comparison

We consider designs of optical lattice clocks in view of the quantum statistics, relevant atomic spins, and atom-lattice interactions. The first two issues lead to two optimal constructions for the clock: a one-dimensional (1D) optical lattice loaded with spin-polarized fermions and a 3D optical lattice loaded with bosons. By taking atomic multipolar interactions with the lattice fields into ac...

All-polarization-maintaining, single-port Er:fiber comb for high-stability comparison of optical lattice clocks