A spin-photon interface using charge-tunable quantum dots strongly coupled to a cavity

Abstract

Charged quantum dots containing an electron or hole spin are bright solid-state qubits suitable for quantum networks and distributed quantum computing. Incorporating such quantum dot spin into a photonic crystal cavity creates a strong spin-photon interface, in which the spin can control a photon by modulating the cavity reflection coefficient. However, previous demonstrations of such spin-photon interfaces have relied on quantum dots that are charged randomly by nearby impurities, leading to instability in the charge state, which causes poor contrast in the cavity reflectivity. Here we demonstrate a strong spin-photon interface using a quantum dot that is charged deterministically with a diode structure. By incorporating this actively charged quantum dot in a photonic crystal cavity, we achieve strong coupling between the cavity mode and the negatively charged state of the dot. Furthermore, by initializing the spin through optical pumping, we show strong spin-dependent modulation of the cavity reflectivity, corresponding to a cooperativity of 12. This spin-dependent reflectivity is important for mediating entanglement between spins using photons, as well as generating strong photon-photon interactions for applications in quantum networking and distributed quantum computing.

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• Integrated Single Photon Emitters
• Deterministic generation of multidimensional photonic cluster states using time-delay feedback
• Optical transparency induced by a largely Purcell-enhanced quantum dot in a polarization-degenerate cavity
• Single quantum emitters with spin ground states based on Cl bound excitons in ZnSe
• The coherence of quantum dot confined electron- and hole-spin in low external magnetic field
• Coherent Control of an Optical Quantum Dot Using Phonons and Photons
• Single-shot readout of a solid-state spin in a decoherence-free subspace
• Quantum repeaters based on individual electron spins and nuclear-spin-ensemble memories in quantum dots
• Entangling Quantum Memories at Channel Capacity