Microcavity controlled coupling of excitonic qubits

Abstract

Controlled non-local energy and coherence transfer enables light harvesting in photosynthesis and non-local logical operations in quantum computing. The most relevant mechanism of coherent coupling of distant qubits is coupling via the electromagnetic field. Here, we demonstrate the controlled coherent coupling of spatially separated excitonic qubits via the photon mode of a solid state microresonator. This is revealed by two-dimensional spectroscopy of the sample's coherent response, a sensitive and selective probe of the coherent coupling. The experimental results are quantitatively described by a rigorous theory of the cavity mediated coupling within a cluster of quantum dots excitons. Having demonstrated this mechanism, it can be used in extended coupling channels - sculptured, for instance, in photonic crystal cavities - to enable a long-range, non-local wiring up of individual emitters in solids.

References in corpus (4)

• Coupling Superconducting Qubits via a Cavity Bus
• Using Sideband Transitions for Two-Qubit Operations in Superconducting Circuits
• Generation and transfer of single photons on a photonic crystal chip
• Nonlinear optical response and exciton dephasing in quantum dots

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