Monday, August 5, 2013

1308.0352 (Peihao Huang et al.)

Spin Relaxation due to Charge Noise    [PDF]

Peihao Huang, Xuedong Hu
We study decoherence of an electron spin qubit in a quantum dot due to charge noise. We find that at the lowest order, the pure dephasing channel is suppressed for both 1/f charge noise and Johnson noise. The relaxation rate depends linearly on the applied magnetic field for typical 1/f noise, and is inversely proportional to the fourth power of the dot confinement energy. Because of the weaker field-dependence, the spin relaxation rate due to charge noise could dominate over phonon noise as the magnetic field decreases. Our calculated spin relaxation times are in the order of seconds in GaAs and 10,000 seconds in Si.
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