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Nguyen CT, Sukachev DD, Bhaskar MK, et al. Quantum Network Nodes Based on Diamond Qubits with an Efficient Nanophotonic Interface. Phys Rev Lett. 2019;123(18):183602doi: 10.1103/PhysRevLett.123.183602.
Nguyen, C. T., Sukachev, D. D., Bhaskar, M. K., Machielse, B., Levonian, D. S., Knall, E. N., Stroganov, P., Riedinger, R., Park, H., Lončar, M., & Lukin, M. D. (2019). Quantum Network Nodes Based on Diamond Qubits with an Efficient Nanophotonic Interface. Physical review letters, 123(18), 183602. https://doi.org/10.1103/PhysRevLett.123.183602
Nguyen, C T, et al. "Quantum Network Nodes Based on Diamond Qubits with an Efficient Nanophotonic Interface." Physical review letters vol. 123,18 (2019): 183602. doi: https://doi.org/10.1103/PhysRevLett.123.183602
Nguyen CT, Sukachev DD, Bhaskar MK, Machielse B, Levonian DS, Knall EN, Stroganov P, Riedinger R, Park H, Lončar M, Lukin MD. Quantum Network Nodes Based on Diamond Qubits with an Efficient Nanophotonic Interface. Phys Rev Lett. 2019 Nov 01;123(18):183602. doi: 10.1103/PhysRevLett.123.183602. PMID: 31763904.
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Phys Rev Lett. 2019 Nov 01;123(18):183602. doi: 10.1103/PhysRevLett.123.183602.

Quantum Network Nodes Based on Diamond Qubits with an Efficient Nanophotonic Interface.

Physical review letters

C T Nguyen, D D Sukachev, M K Bhaskar, B Machielse, D S Levonian, E N Knall, P Stroganov, R Riedinger, H Park, M Lončar, M D Lukin

Affiliations

  1. Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
  2. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
  3. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

PMID: 31763904 DOI: 10.1103/PhysRevLett.123.183602

Abstract

Quantum networks require functional nodes consisting of stationary registers with the capability of high-fidelity quantum processing and storage, which efficiently interface with photons propagating in an optical fiber. We report a significant step towards realization of such nodes using a diamond nanocavity with an embedded silicon-vacancy (SiV) color center and a proximal nuclear spin. Specifically, we show that efficient SiV-cavity coupling (with cooperativity C>30) provides a nearly deterministic interface between photons and the electron spin memory, featuring coherence times exceeding 1 ms. Employing coherent microwave control, we demonstrate heralded single photon storage in the long-lived spin memory as well as a universal control over a cavity-coupled two-qubit register consisting of a SiV and a proximal ^{13}C nuclear spin with nearly second-long coherence time, laying the groundwork for implementing quantum repeaters.

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