Atom-Photon Spin-Exchange Collisions Mediated by Rydberg Dressing
- URL: http://arxiv.org/abs/2003.08709v1
- Date: Thu, 19 Mar 2020 12:04:53 GMT
- Title: Atom-Photon Spin-Exchange Collisions Mediated by Rydberg Dressing
- Authors: Fan Yang, Yong-Chun Liu, Li You
- Abstract summary: We show that photons propagating through a Rydberg-dressed atomic ensemble can exchange its spin state with a single atom.
Such a spin-exchange collision exhibits both dissipative and coherent features, depending on the interaction strength.
- Score: 11.207403145794927
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We show that photons propagating through a Rydberg-dressed atomic ensemble
can exchange its spin state with a single atom. Such a spin-exchange collision
exhibits both dissipative and coherent features, depending on the interaction
strength. For strong interaction, the collision dissipatively drives the system
into an entangled dark state of the photon with an atom. In the weak
interaction regime, the scattering coherently flips the spin of a single photon
in the multi-photon input pulse, demonstrating a generic single-photon
subtracting process. An analytic analysis of this process reveals a universal
trade-off between efficiency and purity of the extracted photon, which applies
to a wide class of single-photon subtractors. We show that such a trade-off can
be optimized by adjusting the scattering rate under a novel phase-matching
condition.
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