Strong coupling of two individually controlled atoms via a nanophotonic cavity

Abstract

We demonstrate photon-mediated interactions between two individually trapped atoms coupled to a nanophotonic cavity. Specifically, we observe superradiant line broadening when the atoms are resonant with the cavity, and level repulsion when the cavity is coupled to the atoms in the dispersive regime. Our approach makes use of individual control over the internal states of the atoms, their position with respect to the cavity mode, as well as the light shifts to tune atomic transitions individually, allowing us to directly observe the anti-crossing of the superradiant and subradiant two-atom states. These observations open the door for realizing quantum networks and studying quantum many-body physics based on atom arrays coupled to nanophotonic devices.

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• Deterministic single-atom source of quasi-superradiant $N$-photon pulses
• Collective atom-cavity coupling and non-linear dynamics with atoms with multilevel ground states
• Unidirectional transmission of single photons under non-ideal chiral photon-atom interactions
• Steady-state entanglement generation for non-degenerate qubits
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• Inverse-designed dielectric cloaks for entanglement generation
• Coupling between guided modes of two parallel nanofibers
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• State Carving in a Chirally-Coupled Atom-Nanophotonic Cavity
• Distance-dependent emission spectrum from two qubits in a strong-coupling regime
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• One-sided composite cavity on an optical nanocapillary fiber
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• A vapor-cavity-QED system for quantum computation and communication
• Excitation spectrum of a multilevel atom coupled with a dielectric nanostructure
• Random singlet phase of cold atoms coupled to a photonic crystal waveguide
• Long-range quantum emitter interactions mediated by a non-local metasurface: Application to qubit-qubit entanglement