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Symposium Latsis on Diamond Photonics - Physics, Technologies and Applications

An integrated quantum network node in diamond

Bartholomeus Machielse, Stefan Bogdanović, Srujan Meesala, Mihir K. Bhaskar, C. T. Nguyen, Денис Дмитриевич Сукачев, David Levonian, Ralf Riedinger, Ruffin E. Evans, Erik Knall, Mikhail D. Lukin, Marko Lončar

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We present quantum network nodes that leverage integration of nanophotonic, electromechanical, and microwave technology to control the optical and spin properties of silicon-vacancy (SiV) color-centers in diamond. We demonstrate strain induced quantum interference between SiV color centers coupled to nanophotonic devices.
DOI
10.1364/dp.2019.105

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Quantum networks hold the promise of secure communication, guaranteed by fundamental laws of physics. Building such networks, however, requires quantum nodes that can relay this quantum information. Here, the authors address practical considerations necessary for building a quantum network node using silicon-vacancy color centers (SiVs) in diamond. Specifically, they describe improvements in nanophotonic cavity design and fabrication, as well as the roles that strain, spin bath, and heating have in performing spin-photon and spin-spin entanglement experiments with SiVs at 100-mK temperatures.
Efficient interfaces between photons and quantum emitters form the basis for quantum networks and enable optical nonlinearities at the single-photon level. We demonstrate an integrated platform for scalable quantum nanophotonics based on silicon-vacancy (SiV) color centers coupled to diamond nanodevices. By placing SiV centers inside diamond photonic crystal cavities, we realize a quantum-optical switch controlled by a single color center. We control the switch using SiV metastable states and observe optical switching at the single-photon level. Raman transitions are used to realize a single-photon source with a tunable frequency and bandwidth in a diamond waveguide. By measuring intensity correlations of indistinguishable Raman photons emitted into a single waveguide, we observe a quantum interference effect resulting from the superradiant emission of two entangled SiV centers.
Efficient interfaces between optical photons and quantum bits are fundamental building blocks for quantum networks and large-scale quantum computers. We demonstrate an integrated platform for scalable quantum optics based on color centers coupled to diamond nanodevices. First, we incorporate nitrogen-vacancy (NV) centers in diamond into hybrid nanophotonic crystal cavities. Despite our progress towards coupling the NV to cavity photons, we find that the NV-cavity interface is limited by the imperfections of the color center's properties and its local environment. We approach this challenge first by characterizing and modifying the diamond surface to reduce the environmental noise affecting the NV optical transition. Subsequently, we develop a new approach that makes use of a quantum emitter with intrinsic protection from this noise: the silicon-vacancy (SiV) center in diamond. We demonstrate that SiV centers introduced through ion implantation feature highly coherent optical transitions, even inside nanostructures. By placing SiV centers inside all-diamond photonic crystal cavities, we achieve strong SiV-photon coupling with a cooperativity of greater than 20. Using this platform, we realize a quantum-optical switch controlled by the spin degree of freedom of a single SiV. By measuring intensity correlations of indistinguishable Raman photons emitted into a single waveguide, we observe a quantum interference effect resulting from the superradiant emission of two probabilistically entangled SiV centers. Finally, we demonstrate controllable photon-mediated interactions between the spin degrees of freedom of two cavity-coupled SiV centers. When the optical transitions of the two SiV centers are tuned into resonance, the coupling of each SiV to the common cavity mode results in a coherent interaction between the two SiVs, leading to the observation of super- and sub-radiant two-SiV states.