Wisconsin Quantum Institute
Quantum Science and Engineering at UW–Madison

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Preliminary Exam
Protocol for robust quantum networks
Date: Wednesday, December 4th
Time: 2:00 pm - 4:00 pm
Place: 5280 Chamberlin Hall or
Speaker: Omar Khaled Nagib Abdelhakim Mohamed, Physics PhD Graduate Student
Abstract: Quantum networks consist of quantum nodes (e.g., atomic qubits) connected by remote entanglement. For scalable quantum networks, it is essential to engineer interactions between remote atomic qubits. This is typically achieved through two-qubit gates between atomic qubits in cavities and flying photons. Previous schemes have been sensitive to experimental imperfections, with fidelities limited to the range of 75–80%. I propose an atom-photon CZ gate that utilizes doubly degenerate ground and excited state energy levels to mediate the atom-light interaction. The setup consists of a cavity and a Mach-Zehnder interferometer. The gate operates by converting error-inducing photons into losses, making the scheme less sensitive to errors compared to previous schemes.

I will also discuss my research progress on two additional projects. The first project proposes the use of Grover's algorithm in a cavity to efficiently prepare entangled states of many qubits. The second project is a mathematical and numerical method that enables fast simulation of open quantum systems through the use of generalized inverses.
Host: Mark Saffman
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