Cavity Quantum Electrodynamics with a Rydberg blocked atomic ensemble

TL;DR

This paper proposes a method to realize the Jaynes-Cummings model using a Rydberg-blocked atomic ensemble coupled to a cavity, enabling strong coupling and novel photon emission behaviors.

Contribution

It introduces a scheme to implement the Jaynes-Cummings model with Rydberg blockade in an atomic ensemble coupled to a cavity, demonstrating strong coupling and unique quantum effects.

Findings

Cavity transmission reveals properties of the Jaynes-Cummings ladder.

Atomic nonlinearity leads to complex photon emission patterns.

Potential for cavity-assisted excitation blockade beyond typical Rydberg interactions.

Abstract

We propose to implement the Jaynes-Cummings model by coupling a few-micrometer large atomic ensemble to a quantized cavity mode and classical laser fields. A two-photon transition resonantly couples the single-atom ground state |g> to a Rydberg state |e> via a non-resonant intermediate state |i>, but due to the interaction between Rydberg atoms only a single atom can be resonantly excited in the ensemble. This restricts the state space of the ensemble to the collective ground state |G> and the collectively excited state |E> with a single Rydberg excitation distributed evenly on all atoms. The collectively enhanced coupling of all atoms to the cavity field with coherent coupling strengths which are much larger than the decay rates in the system leads to the strong coupling regime of the resulting effective Jaynes-Cummings model. We use numerical simulations to show that the cavity transmission can be used to reveal detailed properties of the Jaynes-Cummings ladder of excited states, and that the atomic nonlinearity gives rise to highly non-trivial photon emission from the cavity. Finally, we suggest that the absence of interactions between remote Rydberg atoms may, due to a combinatorial effect, induce a cavity-assisted excitation blockade whose range is larger than the typical Rydberg dipole-dipole interaction length.