Creating a tunable spin squeezing via a time-dependent collective atom-photon coupling

Creating a tunable spin squeezing via a time-dependent collective atom-photon coupling

Lixian Yu,1,2 Jingtao Fan,2 Shiqun Zhu,3 Gang Chen,2,* Suotang Jia,2,† and Franco Nori4,5,6,‡ 1Department of Physics, Shaoxing University, Shaoxing 312000, China 2State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser spectroscopy, Shanxi University, Taiyuan 030006, China 3School of Physical Science and Technology, Soochow University, Suzhou 215006, China 4CEMS, R...

Tunable spin-orbit coupling via strong driving in ultracold-atom systems.

Spin-orbit coupling is an essential ingredient in topological materials, conventional and quantum-gas-based alike. Engineered spin-orbit coupling in ultracold-atom systems-unique in their experimental control and measurement opportunities-provides a major opportunity to investigate and understand topological phenomena. Here we experimentally demonstrate and theoretically analyze a technique for...

Implementation of cavity squeezing of a collective atomic spin.

We squeeze unconditionally the collective spin of a dilute ensemble of laser-cooled 87Rb atoms using their interaction with a driven optical resonator. The shape and size of the resulting spin uncertainty region are well described by a simple analytical model [M. H. Schleier-Smith, I. D. Leroux, and V. Vuletić, arXiv:0911.3936 [Phys. Rev. A (to be published)]] through 2 orders of magnitude in t...

Enhanced squeezing of a collective spin via control of its qudit subsystems.

Unitary control of qudits can improve the collective spin squeezing of an atomic ensemble. Preparing the atoms in a state with large quantum fluctuations in magnetization strengthens the entangling Faraday interaction. The resulting increase in interatomic entanglement can be converted into metrologically useful spin squeezing. Further control can squeeze the internal atomic spin without compro...

Spin squeezing via quantum feedback