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• W2949971013 abstract "The spin state of electrons trapped in a quantum dot only lasts a few microseconds. Before this information is lost, it is useful to controllably rotate the spin as many times as possible. Laser pulses can now rotate electron spins in an ensemble of quantum dots in just a few picoseconds. Coherent manipulation of quantum bits (qubits) on timescales much shorter than the coherence time1,2 is a key prerequisite for quantum information processing. Electron spins in quantum dots are particularly attractive for implementations of qubits, and efficient optical methods for initialization and readout of spins have been developed in recent years3,4. Spin coherence times in the microsecond range have been demonstrated5. Therefore, spin control by picosecond optical pulses would be highly desirable so that a large number of spin rotations could be carried out while coherence is maintained. A major remaining challenge is demonstration of such rotations with high fidelity. Here, we use an ensemble of quantum-dot electron spins focused into a small number of precession modes about a magnetic field by periodic optical pumping. We demonstrate ultrafast optical rotations of spins about arbitrary axes on a picosecond timescale using laser pulses as control fields." @default.
• W2949971013 created "2019-06-27" @default.
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• W2949971013 date "2009-03-22" @default.
• W2949971013 modified "2023-09-26" @default.
• W2949971013 title "Ultrafast optical rotations of electron spins in quantum dots" @default.
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• W2949971013 doi "https://doi.org/10.1038/nphys1226" @default.
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