Approaching a fully-polarized state of nuclear spins in a semiconductor quantum dot
arXiv (Cornell University)(2023)
摘要
Magnetic noise of atomic nuclear spins is a major problem for solid state
spin qubits. Highly-polarized nuclei would not only overcome this obstacle, but
also make nuclear spins 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. Polarizations well above 95
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 quantum bits and
memories, as well as offer a testbed for studies of many-body quantum dynamics
and magnetism.
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关键词
quantum dot,nuclear spins,semiconductor
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