Российский Квантовый Центр Russian Quantum Center

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Open RQC colloquium. Lecture 23

The Twenty Third lecture "Silicon-Vacancy and Germanium-Vacancy color centers in diamond as a platform for quantum optics and communications" in "Open RQC colloquium" will be held in National University of Science and Technology MISIS (Moscow, Leninskiy prospekt 4) lecture hall № Б-536 (5th floor), on 21th of April 2017 at 10:00 a.m by Denis Sukachev, Research Associate in Harvard Univeristy, Researcher in Lebedev Physical Institute.


Realization of quantum computers and quantum networks is a long-running goal in modern Physics. Platforms based on solid-state emitters are of particular interest because such emitters are already trapped in a host material and their cooling is relatively simple. Diamond is very attractive host due to its giant bandgap of 5.5 eV which can accommodate quantum emitters with wavelengths from visible to IR. In this talk I will introduce Silicon-Vacancy and Germanium-vacancy color centers in diamond as a basis of new integrated nanophotonics platform for quantum communications.

Thanks to inversion symmetry of SiV electronic structure, spectral diffusion of its optical transitions is strongly suppressed.

Placing SiV in photonic-crystal nanocavities, we realize efficient atom-photon interface with cooperativity > 1. Based on this, we demonstrate an optical switch for single-photons and generate entanglement between two color centers in the same nanophotonic waveguide.

We performed basic spectroscopy with a new color center in diamond: Germanium-Vacancy. It features the similar electronic structure with inversion symmetry. A higher quantum efficiency of GeV allows us to observe almost 18% attenuation of the probe light by a single GeV center in a waveguide.

I also will discuss our ongoing experiments with SiV centers at <100 mK temperatures aiming long spin-coherence time.


Denis Sukachev has graduated from Moscow Institute of Physics and Technology. He has obtained PhD in Physics and Mathematics from Lebedev Physical Institute. He was a Post Doc in Akimov Lab in RQC and in Department of optics in Lebedev Institute, Research Associate in Lukin Group at Harvard University.


Please don't forget to take passport for entering to the University. We will meet you at the guard desk.


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