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

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

Blog Article

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 feline 1-hcpch vaccine 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 product quantum memories, as well as offer a testbed for studies of many-body quantum dynamics and magnetism.