Synchronization of Active Atomic Clocks via Quantum and Classical Channels

Abstract

Superradiant lasers based on atomic ensembles exhibiting ultra-narrow 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 & 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. [Phys. Rev. Lett. 113, 154101 (2014)] and experimentally observed by Weiner et al. [arXiv:1503.06464 (2015)]. 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.

13 pages, 12 figures

References in corpus (4)

• Systematic evaluation of an atomic clock at 2e-18 total uncertainty
• Synchronization of Interacting Quantum Dipoles
• Quantum synchronization and entanglement of two qubits coupled to a driven dissipative resonator
• Noise and instability of an optical lattice clock

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• Driven-Dissipative Dynamics of Atomic Ensembles in a Resonant Cavity I: Nonequilibrium Phase Diagram and Periodically Modulated Superradiance
• Quantum synchronization blockade induced by nonreciprocal coupling
• Entanglement signatures for quantum synchronization with single-ion phonon laser
• Quantum phases of collective SU(3) spin systems with bipartite symmetry
• Quantum synchronization and correlations of two qutrits in a non-Markovian bath