Fully tunable hyperfine interactions of hole spin qubits in Si and Ge quantum dots

Abstract

Hole spin qubits are frontrunner platforms for scalable quantum computers, but state-of-the-art devices suffer from noise originating from the hyperfine interactions with nuclear defects. We show that these interactions have a highly tunable anisotropy that is controlled by device design and external electric fields. This tunability enables sweet spots where the hyperfine noise is suppressed by an order of magnitude and is comparable to isotopically purified materials. We identify surprisingly simple designs where the qubits are highly coherent and are largely unaffected by both charge and hyperfine noise. We find that the large spin-orbit interaction typical of elongated quantum dots not only speeds up qubit operations, but also dramatically renormalizes the hyperfine noise, altering qualitatively the dynamics of driven qubits and enhancing the fidelity of qubit gates. Our findings serve as guidelines to design high performance qubits for scaling up quantum computers.

References in corpus (23)

• Driven coherent oscillations of a single electron spin in a quantum dot
• An addressable quantum dot qubit with fault-tolerant control fidelity
• Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics
• Prospects for Spin-Based Quantum Computing
• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Hyperfine-mediated gate-driven electron spin resonance
• Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
• Electric Dipole Spin Resonance for Heavy Holes in Quantum Dots
• Hole - Nuclear Spin Interaction in Quantum Dots
• Direct measurement of the hole-nuclear spin interaction in single quantum dots
• Universal phase shift and non-exponential decay of driven single-spin oscillations
• Theory of electric dipole spin resonance in quantum dots: Mean field theory with Gaussian fluctuations and beyond
• Heavy hole states in Germanium hut wires
• Hole spin qubits in Si FinFETs with fully tunable spin-orbit coupling and sweet spots for charge noise
• Hybridization and spin decoherence in heavy-hole quantum dots
• Impact of heavy hole-light hole coupling on optical selection rules in GaAs quantum dots
• Coherent Control of a Single Silicon-29 Nuclear Spin Qubit
• Simple model for electrical hole spin manipulation in semiconductor quantum dots: Impact of dot material and orientation
• First-principles hyperfine tensors for electrons and holes in GaAs and silicon
• Acoustic phonons and strain in core/shell nanowires
• Effect of strain on hyperfine-induced hole-spin decoherence in quantum dots
• Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors