Quantum Network Nodes Based on Diamond Qubits with an Efficient Nanophotonic Interface
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-10-30 |
| Journal | Physical Review Letters |
| Authors | C. T. Nguyen, Denis D. Sukachev, Mihir K. Bhaskar, Bartholomeus Machielse, David Levonian |
| Institutions | Harvard University |
| Citations | 217 |
Abstract
Section titled āAbstractāQuantum 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.