Freiburg 2019 – scientific programme

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FM: Fall Meeting

FM 83: Poster: Enabling Technologies Sources of Quantum States of Light

FM 83.1: Poster

Thursday, September 26, 2019, 16:30–18:30, Tents

Bi-colour photon pair source for light-matter interactions with nitrogen-vacancy centres in diamond — •Julian Gurs, Erik Hesselmeier, Timo Steidl, Charles Babin, Matthias Niethammer, Thomas Kornher, Roland Nagy, Naoya Morioka, Ilja Gerhardt, Roman Kolesov, Jörg Wrachtrup, and Florian Kaiser — 3rd Physics Institute, University of Stuttgart and IQST, Germany

The nitrogen-vacancy centre (NV) in diamond is a promising platform for quantum information distribution. To unleash the full potential, an efficient interface between the NV's natural emission and telecom-wavelength photons is required. To date, wavelength down-converters from 637 nm to 1550 nm suffer from too high photonic noise [1]. Here, we show an alternative solution. We develop a polarisation entangled photon pair source in which one photon is at a telecom wavelength (1560 nm), and the other is generated at 637 nm to match the resonant absorption line of the NV centre. By absorbing the latter photon in the NV centre [2], we intend to entangle the NV centres electron and nuclear spins with a telecom photon. Regarding the photon pair source, we will show our measures to minimise optical loss, while still maintaining a breadboard transportable setup geometry for applications in the field. We will also evaluate the performance of the above mentioned entangled photon storage protocol.

[1] A. Dréau et al., Phys. Rev. Appl. 9, 064031 (2018) [2] S. Yang et al., Nature Photon. 10, 507 (2016)