Theory of fast optical spin rotation in a quantum dot based on geometric phases and trapped states

Details Theory of fast optical spin rotation in a quantum dot based on geometric phases and trapped states Theory of fast optical spin rotation in a quantum dot based on geometric phases and trapped states

2007-03-03

arxiv.org/abs/cond-mat/0703098v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.99.217401

A method is proposed for the optical rotation of the spin of an electron in a quantum dot using excited trion states to implement operations up to two orders of magnitude faster than those of most existing proposals. Key ingredients are the geometric phase induced by 2$\pi$ hyperbolic secant pulses, use of coherently trapped states and use of naturally dark states. Our proposal covers a wide variety of quantum dots by addressing different parameter regimes. In one case the treatment provides an exact solution to the three-level system. Numerical simulations with typical parameters for InAs self-assembled quantum dots, including their dissipative dynamics, give fidelities of the operations in excess of 99%.

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