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, inqnet.caltech.edu) 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.