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Quantum network nodes based on diamond qubits with an efficient nanophotonic interface

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Title: Quantum network nodes based on diamond qubits with an efficient nanophotonic interface
Authors: 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.
Source: Phys. Rev. Lett. 123, 183602 (2019)
Publication Year: 2019
Collection: Quantum Physics
Subject Terms: Quantum Physics
More Details: 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 one millisecond. 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 $^{\mathrm{13}}$C nuclear spin with nearly second-long coherence time, laying the groundwork for implementing quantum repeaters.
Comment: 6 pages, 4 figures
Document Type: Working Paper
DOI: 10.1103/PhysRevLett.123.183602
Access URL: http://arxiv.org/abs/1907.13199
Accession Number: edsarx.1907.13199
Database: arXiv
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  Data: <searchLink fieldCode="AR" term="%22Nguyen%2C+C%2E+T%2E%22">Nguyen, C. T.</searchLink><br /><searchLink fieldCode="AR" term="%22Sukachev%2C+D%2E+D%2E%22">Sukachev, D. D.</searchLink><br /><searchLink fieldCode="AR" term="%22Bhaskar%2C+M%2E+K%2E%22">Bhaskar, M. K.</searchLink><br /><searchLink fieldCode="AR" term="%22Machielse%2C+B%2E%22">Machielse, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Levonian%2C+D%2E+S%2E%22">Levonian, D. S.</searchLink><br /><searchLink fieldCode="AR" term="%22Knall%2C+E%2E+N%2E%22">Knall, E. N.</searchLink><br /><searchLink fieldCode="AR" term="%22Stroganov%2C+P%2E%22">Stroganov, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Riedinger%2C+R%2E%22">Riedinger, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Park%2C+H%2E%22">Park, H.</searchLink><br /><searchLink fieldCode="AR" term="%22Lončar%2C+M%2E%22">Lončar, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Lukin%2C+M%2E+D%2E%22">Lukin, M. D.</searchLink>
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  Data: Phys. Rev. Lett. 123, 183602 (2019)
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  Data: 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 one millisecond. 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 $^{\mathrm{13}}$C nuclear spin with nearly second-long coherence time, laying the groundwork for implementing quantum repeaters.<br />Comment: 6 pages, 4 figures
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