Optical pumping of quantum-dot nuclear spins.
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.
Imamoglu
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A
Institute of Quantum Electronics, ETH Hönggerberg HPT G12, CH-8093 Zürich, Switzerland.
Knill
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E
Tian
L
L
Zoller
P
P