Approaching a fully-polarized state of nuclear spins in a solid.

Approaching a fully-polarized state of nuclear spins in a solid.
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DOI:
10.1038/s41467-024-45364-2
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发表时间:
2024-02-02
影响因子:
16.6
通讯作者:
Chekhovich, Evgeny A.
Chekhovich, Evgeny A.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Millington-Hotze, Peter;Dyte, Harry E.;Manna, Santanu;da Silva, Saimon F. Covre;Rastelli, Armando;Chekhovich, Evgeny A.

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Magnetic noise of atomic nuclear spins is a major source of decoherence in solid-state spin qubits. In theory, near-unity nuclear spin polarization can eliminate decoherence of the electron spin qubit, while turning the nuclei into a useful quantum information resource. However, achieving sufficiently high nuclear polarizations has remained an evasive goal. Here we implement a nuclear spin polarization protocol which combines strong optical pumping and fast electron tunneling. Nuclear polarizations well above 95% are generated in GaAs semiconductor quantum dots on a timescale of 1 minute. The technique is compatible with standard quantum dot device designs, where highly-polarized nuclear spins can simplify implementations of qubits and quantum memories, as well as offer a testbed for studies of many-body quantum dynamics and magnetism. Highly polarized nuclear spins can supress decoherence of electron spin qubits, but this requires near-unity polarization. Here the authors implement a protocol combining optical excitation and fast carrier tunnelling to achieve nuclear spin polarizations above 95% in GaAs quantum dots on a timescale of 1 minute.
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