Optical Entanglement of Distinguishable Quantum Emitters

Abstract

Solid-state quantum emitters are promising candidates for the realization of quantum networks, owing to their long-lived spin memories, high-fidelity local operations, and optical connectivity for long-range entanglement. However, due to differences in local environment, solid-state emitters typically feature a range of distinct transition frequencies, which makes it challenging to create optically mediated entanglement between arbitrary emitter pairs. We propose and demonstrate an efficient method for entangling emitters with optical transitions separated by many linewidths. In our approach, electro-optic modulators enable a single photon to herald a parity measurement on a pair of spin qubits. We experimentally demonstrate the protocol using two silicon-vacancy center sin a diamond nanophotonic cavity, with optical transitions separated by 7.4 GHz. Working with distinguishable emitters allows for individual qubit addressing and readout, enabling parallel control and entanglement of both co-located and spatially separated emitters, a key step towards scaling up quantum information processing systems

6 pages and 3 figures. Supplementary material, 13 pages and 13 figures, is available at the end of the manuscript

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• Diamond Integrated Quantum Photonics: A Review
• Hybrid Integration of GaP Photonic Crystal Cavities with Silicon-Vacancy Centers in Diamond by Stamp-Transfer
• Triply-Resonant Sum Frequency Conversion with Gallium Phosphide Ring Resonators
• Entanglement Assisted Non-local Optical Interferometry in a Quantum Network
• Spectral stability of cavity-enhanced single-photon emitters in silicon
• Learning the dynamics of Markovian open quantum systems from experimental data