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Dipolar Dephasing of Rydberg D-State Polaritons
C Tresp1, P Bienias2, S Weber2
15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.
Physical Review Letters
|September 5, 2015
Summary
We observed anisotropic Rydberg interactions causing dephasing in Rydberg polaritons. This interaction occurs between polaritons even beyond the typical Rydberg blockade distance.
Area of Science:
- Quantum optics
- Atomic physics
- Condensed matter physics
Background:
- Rydberg polaritons are quasiparticles formed by the strong interaction between photons and highly excited Rydberg atoms.
- Anisotropic interactions in quantum systems can lead to complex emergent phenomena.
- Rydberg blockade is a phenomenon that prevents the excitation of multiple Rydberg atoms within a certain distance.
Purpose of the Study:
- To experimentally investigate the impact of anisotropic Rydberg interactions on the propagation of D-state Rydberg polaritons.
- To understand the dephasing mechanisms of Rydberg polaritons at low photon rates.
- To model and attribute the observed dephasing to specific interaction effects.
Main Methods:
- Experimental study of D-state Rydberg polaritons propagating through a cold atomic sample.
- Observation of dephasing at very low photon input rates.
- Development of a theoretical model combining two-photon wave function propagation and nonperturbative anisotropic Rydberg interaction calculations.
Main Results:
- Observed interaction-induced dephasing of Rydberg polaritons.
- Dephasing occurs at very low photon input rates.
- The observed dephasing is attributed to pairwise interactions of Rydberg polaritons at distances exceeding the Rydberg blockade radius.
Conclusions:
- Anisotropic Rydberg interactions significantly influence Rydberg polariton dynamics.
- Pairwise interactions beyond the Rydberg blockade contribute to dephasing.
- This study provides insights into the fundamental interactions governing quantum systems with Rydberg excitations.
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