Optical pumping of quantum-dot nuclear spins |
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Authors: | Imamoglu A Knill E Tian L Zoller P |
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Institution: | Institute of Quantum Electronics, ETH H?nggerberg HPT G12, CH-8093 Zürich, Switzerland. |
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Abstract: | Hyperfine interactions with randomly oriented nuclear spins present a fundamental decoherence mechanism for electron spin in a quantum dot, that can be suppressed by polarizing the nuclear spins. Here, we analyze an all-optical scheme that uses hyperfine interactions to implement laser cooling of quantum-dot nuclear spins. The limitation imposed on spin cooling by the dark states for collective spin relaxation can be overcome by modulating the electron wave function. |
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