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

ABSTRACT: 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.

SUBMITTER: Millington-Hotze P

PROVIDER: S-EPMC10837425 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature

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

Millington-Hotze Peter P Dyte Harry E HE Manna Santanu S Covre da Silva Saimon F SF Rastelli Armando A Chekhovich Evgeny A EA

Nature communications 20240202 1

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 polarizati ...[more]

PMID: 38307879

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