Synchronization of active atomic clocks via quantum and classical channels

authored by

Alexander Roth, Klemens Hammerer

Abstract

Superradiant lasers based on atomic ensembles exhibiting ultranarrow optical transitions can emit light of unprecedented spectral purity and may serve as active atomic clocks. We consider two frequency-detuned active atomic clocks, which are coupled in a cascaded setup, i.e., as master and slave lasers, and study the synchronization of the slave to the master clock. In a setup where both atomic ensembles are coupled to a common cavity mode, such synchronization phenomena have been predicted by Xu et al. [M. Xu, D. A. Tieri, E. C. Fine, J. K. Thompson, and M. J. Holland, Phys. Rev. Lett. 113, 154101 (2014).PRLTAO0031-900710.1103/PhysRevLett.113.154101] and experimentally observed by Weiner et al. (J. M. Weiner, arXiv:1503.06464). Here we demonstrate that synchronization still occurs in cascaded setups but exhibits distinctly different phase diagrams. We study the characteristics of synchronization in comparison to the case of coupling through a common cavity. We also consider synchronization through a classical channel where light of the master laser is measured phase sensitively and the slave laser is injection locked by feedback and compare to the results achievable by coupling through quantum channels.

Organisation(s)

Institute of Theoretical Physics
Institute of Gravitation Physics
CRC 1227 Designed Quantum States of Matter (DQ-mat)

Type

Article

Journal

Physical Review A

Volume

94

ISSN

2469-9926

Publication date

21.10.2016

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

Electronic version(s)

https://doi.org/10.1103/PhysRevA.94.043841 (Access: Unknown)