Characterization of S-T${}_{+}$ Transition Dynamics via Correlation Measurements

Abstract

Nuclear spins are an important source of dephasing for electron spin qubits in GaAs quantum dots. Most studies of their dynamics have focused on the relatively slow longitudinal polarization. We show, based on a semiclassical model and experimentally, that the dynamics of the transverse hyperfine field can be probed by correlating individual Landau-Zener sweeps across the S-T${}_{+}$ transition of a two-electron spin qubit. The relative Larmor precession of different nuclear spin species leads to oscillations in these correlations, whose decay arises from dephasing of the nuclei. In the presence of spin orbit coupling, oscillations with the absolute Larmor frequencies whose amplitude reflects the spin orbit coupling strength are expected.

5 pages, 3 figures

References in corpus (6)

• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
• Quenching of dynamic nuclear polarization by spin-orbit coupling in GaAs quantum dots
• Coherent Adiabatic Spin Control in the Presence of Charge Noise Using Tailored Pulses
• Noise Spectroscopy Using Correlations of Single-Shot Qubit Readout

Cited by in corpus (6)

• Quenching of dynamic nuclear polarization by spin-orbit coupling in GaAs quantum dots
• Quadrupolar and anisotropy effects on dephasing in two-electron spin qubits in GaAs
• Magnetic Gradient Fluctuations from Quadrupolar ${}^{73}$Ge in Si/SiGe Exchange-Only Qubits
• Measurement of back-action from electron spins in a gate defined GaAs double quantum dot coupled to a mesoscopic nuclear spin bath
• Electron spin-flip correlations due to nuclear dynamics in driven GaAs double dots
• Spin-orbit signatures in the dynamics of singlet-triplet qubits in double quantum dots