Observation of quantum phase synchronization in spin-1 atoms

TL;DR

This paper reports the experimental observation of quantum phase synchronization in spin-1 atoms, revealing unique synchronization phenomena driven by anisotropic decay rates and quantum interference, with implications for quantum networks.

Contribution

It demonstrates quantum phase synchronization in spin-1 atoms using anisotropic decay and dark-state polaritons, a novel mechanism not previously observed.

Findings

Synchronization occurs only with engineered decay rates.

Quantum interference can block synchronization.

Arnold tongue-like features are observed.

Abstract

With growing interest in quantum technologies, possibilities of synchronizing quantum systems has garnered significant recent attention. In experiments with dilute ensemble of laser cooled spin-1 $^{87}{Rb}$ atoms, we observe phase difference of spin coherences to synchronize with phases of external classical fields. An initial limit-cycle state of a spin-1 atom localizes in phase space due to dark-state-polaritons generated by classical two-photon tone fields. In particular, when the two couplings fields are out of phase, the limit-cycle state synchronizes only with two artificially engineered, anisotropic decay rates. Furthermore, we observe a blockade of synchronization due to quantum interference and emergence of Arnold tongue-like features. Such anisotropic decay induced synchronization of spin-1 systems with no classical analogue can provide insights in open quantum systems and find applications in synchronized quantum networks.