Inter-valley interactions in Si quantum dots

Details Inter-valley interactions in Si quantum dots Inter-valley interactions in Si quantum dots

2004-05-08

arxiv.org/abs/quant-ph/0405037v2

J. Appl. Phys. 98, 033709 (2005)

Physics

Quantum Physics

Scientific paper

10.1063/1.1994946

In this paper, we studied the inter-valley interactions between the orbital functions associated with multi-valley of silicon (Si) quantum dots. Numerical calculations show that the inter-valley coupling between orbital functions increases rapidly with an applied electric field. We also considered the potential applications to the quantum bit operation utilizing controlled inter-valley interactions. Quantum bits are the multi-valley symmetric and anti-symmetric orbitals. Evolution of these orbitals would be controlled by an external electric field which turns on and off the inter-valley interactions. Estimates of the decoherence time are made for the longitudinal acoustic phonon process. Elementary single and two qubit gates are also proposed.

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