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Condensed Matter Colloquium Thursday, February 17, 2011

Summary: Condensed Matter Colloquium
Thursday, February 17, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Mark A. Eriksson
University of Wisconsin-Madison
Electron Spin Qubits in Si/SiGe Quantum Dots
Motivated in part by the potential for very long electron spin coherence times in
silicon, we are pursuing the development of electron spin qubits in Si/SiGe
quantum dots. I will discuss our recent demonstration of single-shot spin
measurement in such a qubit, and the measurement of spin-relaxation times longer
than one second in such a system. These and similar measurements depend on a
knowledge of tunnel rates between quantum dots and nearby reservoirs, or
between pairs of quantum dots. I will discuss the measurement of these tunnel
rates, the loading of specific quantum states by the control and tuning of those
rates, and the use of tunnel rate measurements to perform spectroscopy of the
quantum dot energy levels, both spin and orbital. Finally, I will discuss the
potential for future advances in Si/SiGe materials, including the use of
SiGe/Si/SiGe nanomembranes to aid in the growth and fabrication of very low
disorder heterostructures and quantum dots.


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science