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6CCVD Research

Spin measurements of NV centers coupled to a photonic crystal cavity

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2019-12-01
JournalAPL Photonics
AuthorsT. Jung, J. Gƶrlitz, B. Kambs, C. Pauly, N. Raatz
InstitutionsLeipzig University, Element Six (United Kingdom)
Citations24

Abstract

Section titled ā€œAbstractā€

Nitrogen-vacancy (NV) centers feature outstanding properties such as a spin coherence time of up to 1 s as well as a level structure offering the possibility to initialize, coherently manipulate, and optically read-out the spin degree of freedom of the ground state. However, only about 3% of their photon emission is channeled into the zero phonon line (ZPL), limiting both the rate of indistinguishable single photons and the signal-to-noise ratio (SNR) of coherent spin-photon interfaces. We here report on the enhancement of the SNR of the optical spin read-out achieved by tuning the mode of a two-dimensional photonic crystal (PhC) cavity into resonance with the NV-ZPL. PhC cavities are fabricated by focused ion beam milling in thin reactive ion etched ultrapure single crystal diamond membranes featuring modes with Q-factors of up to 8250 at mode volumes below one cubic wavelength. NV centers are produced in the cavities in a controlled fashion by a high resolution atomic force microscope implantation technique. On cavity resonance, we observe a lifetime shortening from 9.0 ns to 8.0 ns as well as an enhancement of the ZPL emission by almost one order of magnitude. Although on resonance the collection efficiency of ZPL photons and the spin-dependent fluorescence contrast are reduced, the SNR of the optical spin read-out is almost tripled for the cavity-coupled NV centers.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
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  3. 2013 - Solid-state electronic spin coherence time approaching one second [Crossref]
  4. 2018 - One-second coherence for a single electron spin coupled to a multi-qubit nuclear-spin environment [Crossref]
  5. 2011 - High-fidelity projective read-out of a solid-state spin quantum register [Crossref]
  6. 2004 - Observation of coherent oscillations in a single electron spin [Crossref]
  7. 1997 - Scanning confocal optical microscopy and magnetic resonance on single defect centers [Crossref]
  8. 2018 - Dephasing mechanisms of diamond-based nuclear-spin memories for quantum networks [Crossref]
  9. 2018 - Theory of the optical spin-polarization loop of the nitrogen-vacancy center in diamond [Crossref]
  10. 2010 - Quantum register based on coupled electron spins in a room-temperature solid [Crossref]

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