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QES Seminar 2/21/2011 - Ultra-Fast Electrical Control of Single Spin Dynamics, Jason Petta

A single electron spin in a magnetic field forms a two-level system that can be used as a quantum bit. The electron spin is weakly coupled to the environment, resulting in spin lifetimes exceeding one second and coherence times approaching 200 microseconds. While long coherence times have been relatively easy to achieve, one of the most fundamental requirements- single spin control- has continued to be a challenge. Due to the small magnetic moment of the electron spin, it is difficult to drive spin rotations on timescales that are faster than the spin dephasing time and to individually address a single spin on the nanometer scale. In this talk, I will describe 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 utilizes a spin-dependent anti-crossing in the energy level spectrum of our quantum dot “artificial atomâ€?. The second method utilizes the strong spin-orbit coupling of InAs for single spin control. Both methods are orders of magnitude faster than conventional electron spin resonance in GaAs quantum dots. Moreover, they allow all-electrical control of single spin dynamics, and eventual implementation of a CNOT gate.

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Location: Bowen Hall Atrium

Date/Time: 02/21/11 at 12:30 pm - 02/21/11 at 1:30 pm

Category: PRISM/MITRE (QES) Seminar Series

Department: PRISM