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Proceedings Paper

Tunable open-cavity coupling to the zero phonon line of a nitrogen-vacancy defect in diamond (Conference Presentation)
Author(s): Sam Johnson; Laiyi Weng; Philip R. Dolan; Aurelien A. P. Trichet; Sanmi Adekanye; Yu-Chen Chen; Ross Leyman; Paul Hill; Ben Green; Gavin Morley; Mark E. Newton; Erdan Gu; Jason M. Smith

Paper Abstract

Recent demonstrations of entanglement between two remote Nitrogen-Vacancy centers, have opened the way for their use in distributed quantum networks. An efficient spin-photon interface will now be required to help realize this system as a technology. Here we demonstrate the tunable enhancement of the zero phonon line of a single nitrogen-vacancy colour centre in nanodiamond at cryogenic temperatures. A plano-hemispherical open cavity, fabricated using focused ion beam milling provides mode volumes as small as 1.25 cubic microns and quality factor Q ~ 3000. It will be shown how the open geometry and independently adjustable mirrors allows for precise placement of the emitter in the centre of the cavity mode, and crucially enables in-situ tuning of the cavity resonances. At optimal coupling, the signal from individual zero phonon line transitions is enhanced by a factor of 6.25 through the Purcell effect and the overall emission rate of the NV- centre is increased by 40% compared with that measured from the same centre in the absence of cavity field confinement. This Purcell enhancement is mapped out as a function of cavity mode volume. These results represent a proof of principle for a tunable cryogenic spin-photon interface. However by far the best NV optical and spin coherences are to be found in bulk material and efforts towards the production of diamond membranes are currently being made, with dimensions suitable for open-cavity coupling. Efforts towards this and preliminary results will also be discussed.

Paper Details

Date Published: 2 June 2017
PDF: 1 pages
Proc. SPIE 10118, Advances in Photonics of Quantum Computing, Memory, and Communication X, 101180W (2 June 2017); doi: 10.1117/12.2251479
Show Author Affiliations
Sam Johnson, Univ. of Oxford (United Kingdom)
Laiyi Weng, Univ. of Oxford (United Kingdom)
Philip R. Dolan, Univ. of Oxford (United Kingdom)
Aurelien A. P. Trichet, Univ. of Oxford (United Kingdom)
Sanmi Adekanye, Univ. of Oxford (United Kingdom)
Yu-Chen Chen, Univ. of Oxford (United Kingdom)
Ross Leyman, Univ. of Strathclyde (United Kingdom)
Paul Hill, Univ. of Strathclyde (United Kingdom)
Ben Green, Univ. of Strathclyde (United Kingdom)
Gavin Morley, Univ. of Warwick (United Kingdom)
Mark E. Newton, Univ. of Warwick (United Kingdom)
Erdan Gu, Univ. of Strathclyde (United Kingdom)
Jason M. Smith, Univ. of Oxford (United Kingdom)

Published in SPIE Proceedings Vol. 10118:
Advances in Photonics of Quantum Computing, Memory, and Communication X
Zameer Ul Hasan; Philip R. Hemmer; Hwang Lee; Alan L. Migdall, Editor(s)

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