Dephasing of multiparticle Rydberg excitations for fast entanglement generation

Abstract

An approach to fast entanglement generation based on Rydberg dephasing of collective excitations (spin-waves) in large, optically thick atomic ensembles is proposed. Long-range $1/r^3$ atomic interactions are induced by microwave mixing of opposite-parity Rydberg states. Required long coherence times are achieved via four-photon excitation and read-out of long wavelength spin-waves. The dephasing mechanism is shown to have favorable, approximately exponential, scaling for entanglement generation.

4 pages, 3 figures

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• Tailoring Rydberg interactions via Förster resonances: state combinations, hopping and angular dependence
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• Many-body radiative decay in strongly interacting Rydberg ensembles
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• Dipolar Rydberg-atom gas prepared by adiabatic passage through an avoided crossing
• Controlled dissipation for Rydberg atom experiments
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• Continuously tunable single-photon level nonlinearity with Rydberg state wave-function engineering
• Enhanced photon correlations due to strong laser-atom-cavity coupling
• Resonance triplet dynamics in the quenched unitary Bose gas
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• Probing the indistinguishability of single photons generated by Rydberg atomic ensembles
• Single photonic qutrit in a collective Rydberg polariton
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