Exchange Control of Nuclear Spin Diffusion in a Double Quantum Dot

Abstract

Coherent two-level systems, or qubits, based on electron spins in GaAs quantum dots are strongly coupled to the nuclear spins of the host lattice via the hyperfine interaction. Realizing nuclear spin control would likely improve electron spin coherence and potentially enable the nuclear environment to be harnessed for the long-term storage of quantum information. Toward this goal, we report experimental control of the relaxation of nuclear spin polarization in a gate-defined two-electron GaAs double quantum dot. A cyclic gate-pulse sequence transfers the spin of an electron pair to the host nuclear system, establishing a local nuclear polarization that relaxes on a time scale of seconds. We find nuclear relaxation depends on magnetic field and gate-controlled two-electron exchange, consistent with a model of electron mediated nuclear spin diffusion.

related papers at http://marcuslab.harvard.edu

References in corpus (20)

• Spins in few-electron quantum dots
• Relaxation, dephasing, and quantum control of electron spins in double quantum dots
• Theory of electron spin decoherence by interacting nuclear spins in a quantum dot
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• Quantum theory for electron spin decoherence induced by nuclear spin dynamics in semiconductor quantum computer architectures: Spectral diffusion of localized electron spins in the nuclear solid-state environment
• Suppressing Spin Qubit Dephasing by Nuclear State Preparation
• Knight Field Enabled Nuclear Spin Polarization in Single Quantum Dots
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath
• Hyperfine-mediated gate-driven electron spin resonance
• Electron-nuclear interaction in 13C nanotube double quantum dots
• Pure quantum dephasing of a solid state electron spin qubit in a large nuclear spin bath coupled by long-range hyperfine-mediated interactions
• Dynamic Nuclear Polarization with Single Electron Spins
• Nuclear Spin Switch in Semiconductor Quantum Dots
• Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron
• Measurement of Temporal Correlations of the Overhauser Field in a Double Quantum Dot
• Large nuclear Overhauser fields detected in vertically-coupled double quantum dots
• Electrically-Driven Reverse Overhauser Pumping of Nuclear Spins in Quantum Dots
• Nuclear spin dynamics and Zeno effect in quantum dots and defect centers
• Nuclear Spins as Quantum Memory in Semiconductor Nanostructures

Cited by in corpus (34)

• Semiconductor Spin Qubits
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Cryogenic Control Architecture for Large-Scale Quantum Computing
• Electron-nuclear interaction in 13C nanotube double quantum dots
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Spectrum of the Nuclear Environment for GaAs Spin Qubits
• Single-spin qubits in isotopically enriched silicon at low magnetic field
• Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain
• Relaxation and Readout Visibility of a Singlet-Triplet Qubit in an Overhauser Field Gradient
• Hyperfine interaction dominated dynamics of nuclear spins in self-assembled quantum dots
• Dephasing of electron spin qubits due to their interaction with nuclei in quantum dots
• Quantum theory of the charge stability diagram of semiconductor double quantum dot systems
• Large nuclear spin polarization in gate-defined quantum dots using a single-domain nanomagnet
• Two-spin dephasing by electron-phonon interaction in semiconductor double quantum dots
• Decoherence of two entangled spin qubits coupled to an interacting sparse nuclear spin bath: application to nitrogen vacancy centers
• General theory of feedback control of a nuclear spin ensemble in quantum dots
• Nuclear Dynamics During Landau-Zener Singlet-Triplet Transitions in Double Quantum Dots
• Dynamics of Overhauser Field under nuclear spin diffusion in a quantum dot
• Transfer of a quantum state from a photonic qubit to a gate-defined quantum dot
• The theory of coherent dynamic nuclear polarization in quantum dots
• Dephasing and Hyperfine Interaction in Carbon Nanotubes Double Quantum Dots: Disordered Case
• Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot
• Narrowing of the Overhauser field distribution by feedback-enhanced dynamic nuclear polarization
• Wigner-molecularization-enabled dynamic nuclear field programming
• Characterization of a quasi-static environment with a qubit
• Dynamical Self-Quenching of Spin Pumping into Double Quantum Dots
• Spin textures in strongly coupled electron spin and magnetic or nuclear spin systems in quantum dots
• Interlayer Diffusion of Nuclear Spin Polarization in $\nu =2/3$ Quantum Hall States
• Inhomogeneous dynamic nuclear polarization and suppression of electron-polarization decay in a quantum dot
• Noise suppression and long-range exchange coupling for gallium arsenide spin qubits
• Self-Quenching of Nuclear Spin Dynamics in Central Spin Problem
• Anisotropic nuclear-spin diffusion in double quantum wells
• Transport-induced suppression of nuclear field fluctuations in multi-quantum-dot systems
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots