Fast Optically Driven Spin Qubit Gates in an InAs Quantum Dot

The ability to manipulate the spin states of charges confined in quantum dots (QDs) is essential for the realization of a quantum computer based on such spins. Here, we present experimentally realized electron spin qubit gates in a single self-assembled InAs QD using a combination of picosecond optical pulses, spin precession about an external DC magnetic field and optically generated geometric phases. Arbitrary unitary operations on the electron spin qubit may be constructed using a combination of optical pulses and either spin precession or the optically generated geometric phases.
Presented at SPIE Photonics West 2010 held 24-29 Jan 2010 in San Francisco, CA. Published in Advances in Photonics of Quantum Computing, Memory, and Communication III, 2010.