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Control and distribution of entanglement in quantum networks


Quantum networks are pursued as a quantum backbone on which to perform secure quantum communications, distributed quantum sensing, and blind quantum computation. The building blocks of these networks are quantum repeaters, where photonic quantum information carriers are generated and error corrected through interactions with matter qubits. I will describe two paradigms of quantum repeaters and discuss in each case how careful control of a register of spin qubits can increase the entanglement distribution rate over the network. Specifically, I will describe our recent work on the accurate and fast control of nuclear spin memory qubits coupled to spin defects such as the NV center in diamond. I will also discuss the deterministic generation of photonic ‘graph’ states from such quantum emitters.

Bio: Sophia Economou is a Professor and the T. Marshall Hahn Chair in Physics at Virginia Tech. She is also the director of the Virginia Tech Center for Quantum Information Science and Engineering. She focuses on theoretical research in quantum information science, including quantum computing, quantum communications, and quantum simulation algorithms.

Control and distribution of entanglement in quantum networks
Host: Hoi-Kwong Lo
Event series  Physics Colloquium