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Monday, May 23, 2022
12:30 PM - 1:30 PM
Online and In-Person Event

INQNET Seminar

Quantum Networks based on Integrated Diamond Photonics
Daniel Assumpcao, Harvard University,


The realization of quantum networks relies on the ability to efficiently interface multi-qubit nodes with quantum information encoded in streams of incoming single photons. In this talk, I will discuss our recent work on developing these key ingredients using silicon-vacancy (SiV) defects integrated into nanophotonic resonators in diamond. First, I will discuss a two-qubit SiV-based register deterministically created by the implantation of Silicon-29 ions into nanophotonic cavities. We demonstrate high fidelity control of the two-qubit system with a coherence time of the auxiliary nuclear memory exceeding 1 second. Furthermore, via utilizing a highly strained SiV, we show nuclear spin-photon gates operational at temperatures up to 4K.  Second, I will show work utilizing the SiV to deterministically create arbitrarily shaped photons that can be effectively interfaced with our spin-photon interface. We demonstrate the high efficiency (detection efficiency = 14.9%) and high purity (g(2) (0) = 0.0168) of the source, in addition to showing the ability to create photon streams of up to 11 photons. These two demonstrations serve as key steps towards realizing a SiV based quantum repeater node.

Downs-Lauritsen Room 469 and via zoom.

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Meeting ID: 933 0458 4361

INQNET (INtelligent Quantum NEtworks & Technologies, is a research program that aims to bring together academia, national laboratories, and industry to advance quantum science and technology and address relevant fundamental questions in physics.

For more information, please contact Nikolai Lauk by email at