Approaching a fully-polarized state of nuclear spins in a semiconductor quantum dot

Abstract

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% 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 quantum bits and memories, as well as offer a testbed for studies of many-body quantum dynamics and magnetism.

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Cited by in corpus (6)

• Quantum non-demolition measurement of an electron spin qubit through its low-energy many-body spin environment
• The formation of a nuclear-spin dark state in silicon
• Stark Tuning and Charge State Control in Individual Telecom C-Band Quantum Dots
• Hilbert Space Fragmentation and Subspace Scar Time-Crystallinity in Driven Homogeneous Central-Spin Models
• Slowly generated anomalously large nuclear field in bulk n-AlGaAs
• Routing single photons with quantum emitters coupled to nanostructures