Spin-orbit Interactions for Singlet-Triplet Qubits in Silicon

Abstract

Spin-orbit coupling is relatively weak for electrons in bulk silicon, but enhanced interactions are reported in nanostructures such as the quantum dots used for spin qubits. These interactions have been attributed to various dissimilar interface effects, including disorder or broken crystal symmetries. In this Letter, we use a double-quantum-dot qubit to probe these interactions by comparing the spins of separated singlet-triplet electron pairs. We observe both intravalley and intervalley mechanisms, each dominant for [110] and [100] magnetic field orientations, respectively, that are consistent with a broken crystal symmetry model. We also observe a third spin-flip mechanism caused by tunneling between the quantum dots. This improved understanding is important for qubit uniformity, spin control and decoherence, and two-qubit gates.

References in corpus (18)

• An addressable quantum dot qubit with fault-tolerant control fidelity
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• A Crossbar Network for Silicon Quantum Dot Qubits
• Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
• Suppressing qubit dephasing using real-time Hamiltonian estimation
• Electron spin decoherence in isotope-enriched silicon
• Probing low noise at the MOS interface with a spin-orbit qubit
• Electrically driven electron spin resonance mediated by spin-valley-orbit coupling in a silicon quantum dot
• Controlling spin-orbit interactions in silicon quantum dots using magnetic field direction
• High-fidelity single-shot readout for a spin qubit via an enhanced latching mechanism
• Valley dependent anisotropic spin splitting in silicon quantum dots
• Electron g-factor of valley states in realistic silicon quantum dots
• Spin of a multielectron quantum dot and its interaction with a neighboring electron
• Inverted Singlet-Triplet Qubit Coded on a Two-Electron Double Quantum Dot
• Effects of charge noise on a pulse-gated singlet-triplet $S-T_{-}$ qubit

Cited by in corpus (33)

• Semiconductor Spin Qubits
• Qubits made by advanced semiconductor manufacturing
• Nonadiabatic Landau-Zener-Stückelberg-Majorana transitions, dynamics, and interference
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• A singlet triplet hole spin qubit in planar Ge
• Ultrafast coherent control of a hole spin qubit in a germanium quantum dot
• Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
• Long-lived valley states in bilayer graphene quantum dots
• Shuttling an electron spin through a silicon quantum dot array
• Electric-field control and noise protection of the flopping-mode spin qubit
• Spin shuttling in a silicon double quantum dot
• Strong electron-electron interactions in Si/SiGe quantum dots
• Giant anisotropy of spin relaxation and spin-valley mixing in a silicon quantum dot
• A silicon singlet-triplet qubit driven by spin-valley coupling
• Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits
• Adiabatic electron charge transfer between two quantum dots in presence of 1/f noise
• Simulation of 1/f charge noise affecting a quantum dot in a Si/SiGe structure
• Spin rotation by resonant electric field in few-level quantum dots: Floquet dynamics and tunneling
• Magnetic degeneracy points in interacting two-spin systems: geometrical patterns, topological charge distributions, and their stability
• Line Shapes of Electric Dipole Spin Resonance in Pauli Spin Blockade
• Entangling gates on degenerate spin qubits dressed by a global field
• Decoherence of electron spin qubit during transfer between two semiconductor quantum dots at low magnetic fields
• Hybrid Exchange Measurement-Based Qubit Operations in Semiconductor Double Quantum Dot Qubits
• Hyperfine-assisted decoherence of a phosphorus nuclear-spin qubit in silicon
• Measurement of enhanced spin-orbit coupling strength for donor-bound electron spins in silicon
• Quantum Computation by Spin Parity Measurements with Encoded Spin Qubits
• Microscopic theory on magnetic-field-tuned sweet spot of exchange interactions in multielectron quantum-dot systems
• Theory on electron-phonon spin dehphasing in GaAs multi-electron double quantum dots
• Ultra-Fast All-Electrical Universal Nano-Qubits
• Dressed basis sets for the modeling of exchange interactions in double quantum dots
• Micromagnet-free operation of electron spin qubits in Si/Si${}_{1-x}$Ge${}_x$ vertical double quantum dots
• Heavy-hole spin relaxation in quantum dots: Isotropic versus anisotropic effects
• Fast high-fidelity baseband reset of a latched state for quantum dot qubit readout