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- W2068049399 abstract "Electrons trapped in quantum dots can exhibit quantum-coherent spin dynamics over long timescales. These timescales are limited by the coupling of electron spins to the disordered nuclear spin background, which is a major source of noise and dephasing in such systems. We propose a scheme for controlling and suppressing fluctuations of nuclear spin polarization in double quantum dots, which uses nuclear spin pumping in the spin-blockade regime. We show that nuclear spin polarization fluctuations can be suppressed when electronic levels in the two dots are properly positioned near resonance. The proposed mechanism is analogous to that of optical Doppler cooling. The Overhauser shift due to fluctuations of nuclear polarization brings electron levels in and out of resonance, creating internal feedback to suppress fluctuations. Estimates indicate that a better than 10-fold reduction of fluctuations is possible." @default.
- W2068049399 created "2016-06-24" @default.
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- W2068049399 date "2010-06-22" @default.
- W2068049399 modified "2023-09-27" @default.
- W2068049399 title "Dynamical cooling of nuclear spins in double quantum dots" @default.
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- W2068049399 doi "https://doi.org/10.1088/0957-4484/21/27/274016" @default.
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