EECS Department Colloquium Series

Quantum computing: Electrically controlled qubits in silicon

Yoshua Bengio

Wednesday, October 28, 2015
306 Soda Hall (HP Auditorium)
4:00 - 5:00 pm

Thaddeus Ladd
HRL Laboratories, LLC

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Quantum information processing aims to leverage the properties of quantum mechanics to manipulate information in ways that are not otherwise possible. This would enable, for example, quantum computers that could solve certain problems exponentially faster than a conventional supercomputer. One promising approach for building such a machine is to use gated silicon quantum dots. In the approach taken at HRL Laboratories, individual electrons are trapped in a gated potential well at the barrier of a Si/SiGe heterostructure. Spins on these electrons are compelling candidates for qubits due to their long coherence time, all-electrical control, and compatibility with conventional fabrication techniques. In this talk I will discuss the recent demonstration of all-electrical control of silicon-based qubits made from triple quantum dots in isotopically purified material, including methods to mitigate charge noise. The results indicate a strong future for silicon-based quantum technology.

Thaddeus Ladd is currently Senior Staff Research Physicist at HRL Laboratories in Malibu, California.  He received his Ph.D. in 2005 from the Applied Physics Department of Stanford University as a fellow of the Fannie and John Hertz foundation.  He continued quantum optics research at Stanford's E. L. Ginzton Laboratory as project researcher for the University of Tokyo and the National Institute of Informatics, Tokyo until 2009. His research interests include semiconductor-based quantum information science, especially the interface between robust control (including electrical, RF, and optical methods) and experimental noise modeling.

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