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

Peter Millington-Hotze, Harry E. Dyte, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli and Evgeny A. Chekhovich ()
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Peter Millington-Hotze: University of Sheffield
Harry E. Dyte: University of Sheffield
Santanu Manna: Johannes Kepler University Linz
Saimon F. Covre da Silva: Johannes Kepler University Linz
Armando Rastelli: Johannes Kepler University Linz
Evgeny A. Chekhovich: University of Sheffield

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-45364-2

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