Optical Entanglement of Distinguishable Quantum Emitters

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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 centers in 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 colocated and spatially separated emitters, a key step toward scaling up quantum information processing systems.
Funding Information
  • National Science Foundation (1541959, DGE1745303)
  • Air Force Office of Scientific Research
  • Multidisciplinary University Research Initiative
  • Army Research Laboratory
  • Alexander von Humboldt-Stiftung
  • Deutsche Forschungsgemeinschaft (EXC 2056, 390715994)
  • U.S. Department of Energy (DE-SC0020115)
  • Blanche Moore Foundation (4342.01)
  • NSF, Center for Ultracold Atoms (1734011)
  • Department of Defense Army Research Office Defense University Research Instrumentation Program
  • Office of Naval Research Multidisciplinary University Research Initiative
  • Harvard Center for Nanoscale Systems
  • Graduate Research Fellowships Program

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