Coherent spin control of a nanocavity-enhanced qubit in diamond

Luozhou Li, Tim Schröder, Edward H. Chen, Michael Walsh, Igal Bayn, Jordan Goldstein, Ophir Gaathon, Matthew E. Trusheim, Ming Lu, Jacob Mower, Mircea Cotlet, Matthew L. Markham, Daniel J. Twitchen and Dirk Englund ()
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Luozhou Li: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Tim Schröder: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Edward H. Chen: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Michael Walsh: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Igal Bayn: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Jordan Goldstein: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Ophir Gaathon: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Matthew E. Trusheim: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Ming Lu: Center for Functional Nanomaterials, Brookhaven National Laboratory
Jacob Mower: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
Mircea Cotlet: Center for Functional Nanomaterials, Brookhaven National Laboratory
Matthew L. Markham: Element Six
Daniel J. Twitchen: Element Six
Dirk Englund: Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract A central aim of quantum information processing is the efficient entanglement of multiple stationary quantum memories via photons. Among solid-state systems, the nitrogen-vacancy centre in diamond has emerged as an excellent optically addressable memory with second-scale electron spin coherence times. Recently, quantum entanglement and teleportation have been shown between two nitrogen-vacancy memories, but scaling to larger networks requires more efficient spin-photon interfaces such as optical resonators. Here we report such nitrogen-vacancy-nanocavity systems in the strong Purcell regime with optical quality factors approaching 10,000 and electron spin coherence times exceeding 200 μs using a silicon hard-mask fabrication process. This spin-photon interface is integrated with on-chip microwave striplines for coherent spin control, providing an efficient quantum memory for quantum networks.

Date: 2015
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DOI: 10.1038/ncomms7173

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