Bulletin of the American Physical Society
APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012; Boston, Massachusetts
Session T29: Focus Session: Semiconductor Qubits - Coherent Control, Decoherence, and Relaxation
2:30 PM–5:30 PM,
Wednesday, February 29, 2012
Sponsoring Unit: GQI
Chair: Charles Tahan, Laboratory for Physical Sciences
Abstract ID: BAPS.2012.MAR.T29.1
Abstract: T29.00001 : Electrical control of single spin dynamics*
2:30 PM–3:06 PM
Preview Abstract Abstract
Over ten years ago, Daniel Loss and David DiVincenzo proposed using the spin of a single electron as a quantum bit. At the time of the proposal, it was not possible to trap a single electron in a device and measure its spin, let alone demonstrate control of quantum coherence. In this talk I will describe recent progress in the field, focusing on two new methods for single spin control that have been developed by my group at Princeton. The first method is based on quantum interference and implements spin-interferometry on a chip. The second method utilizes the strong spin-orbit coupling of InAs. By shifting the orbital position of the electronic wavefunction at gigahertz frequencies, we can control the orientation of a single electron spin and measure the full g-tensor, which exhibits a large anisotropy due to spin-orbit interactions. Both methods for single spin control are orders of magnitude faster than conventional electron spin resonance and allow investigations of single spin coherence in the presence of fluctuating nuclear and spin-orbit fields. I will also describe recent efforts to transfer these methods to silicon quantum dots, where the effects of fluctuating nuclear fields are much smaller.
*Research performed in collaboration with Michael Schroer, Karl Petersson, Minkyung Jung, George Stehlik, Hong Lu, and Art Gossard. We acknowledge support from the Sloan and Packard Foundations, ARO, DARPA, and NSF.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.T29.1
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