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Friday, November 09, 2018
12:00 PM - 1:00 PM
East Bridge 114

IQIM Postdoctoral and Graduate Student Seminar

A photonic link for donor spin qubits in silicon
Stephanie Simmons, Asst Professor, Silicon Quantum Technology Lab, Simon Fraser University,
Speaker's Bio:
Dr. Stephanie Simmons is an Assistant Professor of Physics and Canada Research Chair in Quantum Nanoelectronics at Simon Fraser University, Canada. She received a B.Math from Waterloo (2008), a D.Phil. in Materials Science from Oxford (2011) and was based in UNSW's Electrical Engineering department for her postdoc before joining Simon Fraser University in the fall of 2015. She has worked on silicon-based spin qubits with the particular aim to develop CMOS-compatible scalable quantum technology solutions. Her work on silicon-based qubits was awarded a Physics World Top Ten Breakthrough of the Year of 2013 and again in 2015. She has published in the Nature, Science, and the Physical Review families of journals, and her work has been covered by the New York Times, CBC, BBC, Scientific American, the New Scientist, and others.

Abstract: Atomically identical donor spin qubits in silicon offer excellent native quantum properties, which match or outperform many qubit rivals. To scale up such systems it would be advantageous to connect silicon donor spin qubits in a cavity-QED architecture. A few proposals in this direction introduce strong electric dipole interactions to the otherwise largely isolated spin qubit ground state in order to couple to superconducting cavities, however these strategies have poor or unknown coherence properties. Here I present an alternative approach, which uses the built-in strong electric dipole (optical) transitions of singly-ionized double donors in silicon. These donors, such as chalcogen donors S+, Se+, and Te+, have the same ground-state spin Hamiltonians as the extensively studied shallow donors, yet offer mid-gap binding energies and mid-IR optical access to excited orbital states. This photonic link is spin-selective which could be harnessed to measure and couple bulk-like donor qubits using photonic cavity-QED at 4.2K.

For more information, please phone 626-395-4013 or email marciab@caltech.edu or