Operating semiconductor quantum processors with hopping spins

Abstract

Qubits that can be efficiently controlled are essential for the development of scalable quantum hardware. While resonant control is used to execute high-fidelity quantum gates, the scalability is challenged by the integration of high-frequency oscillating signals, qubit crosstalk and heating. Here, we show that by engineering the hopping of spins between quantum dots with site-dependent spin quantization axis, quantum control can be established with discrete signals. We demonstrate hopping-based quantum logic and obtain single-qubit gate fidelities of 99.97\%, coherent shuttling fidelities of 99.992\% per hop, and a two-qubit gate fidelity of 99.3\%, corresponding to error rates that have been predicted to allow for quantum error correction. We also show that hopping spins constitute a tuning method by statistically mapping the coherence of a 10-quantum dot system. Our results show that dense quantum dot arrays with sparse occupation could be developed for efficient and high-connectivity qubit registers.

main text with 18 pages and 3 figures, supplementary materials with 64 pages and 26 figures, in a single file

References in corpus (52)

• Surface codes: Towards practical large-scale quantum computation
• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Driven coherent oscillations of a single electron spin in a quantum dot
• An addressable quantum dot qubit with fault-tolerant control fidelity
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• Semiconductor Spin Qubits
• Spin-orbit qubit in a semiconductor nanowire
• Interfacing spin qubits in quantum dots and donors - hot, dense and coherent
• How to Enhance Dephasing Time in Superconducting Qubits
• Computing with spin qubits at the surface code error threshold
• Fast universal quantum control above the fault-tolerance threshold in silicon
• High-threshold and low-overhead fault-tolerant quantum memory
• Universal control of a six-qubit quantum processor in silicon
• Demonstration of qubit operations below a rigorous fault tolerance threshold with gate set tomography
• A four-qubit germanium quantum processor
• The germanium quantum information route
• Quantum computing with nearest neighbor interactions and error rates over 1%
• Fidelity of quantum operations
• Fast two-qubit logic with holes in germanium
• A Crossbar Network for Silicon Quantum Dot Qubits
• Electric Dipole Spin Resonance for Heavy Holes in Quantum Dots
• Low disordered, stable, and shallow germanium quantum wells: a playground for spin and hybrid quantum technology
• Ultrafast coherent control of a hole spin qubit in a germanium quantum dot
• Investigating the limits of randomized benchmarking protocols
• Universal logic with encoded spin qubits in silicon
• The impact of classical control electronics on qubit fidelity
• Theory of Hole-Spin Qubits in Strained Germanium Quantum Dots
• Three-electron spin qubits
• Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power
• Simultaneous single-qubit driving of semiconductor spin qubits at the fault-tolerant threshold
• Quantifying error and leakage in an encoded Si/SiGe triple-dot qubit
• High-order noise filtering in nontrivial quantum logic gates
• Distant spin entanglement via fast and coherent electron shuttling
• Probing quantum processor performance with pyGSTi
• Dynamics of hole singlet triplet qubits with large g-factor differences
• Optimization of a solid-state electron spin qubit using Gate Set Tomography
• Sweet-spot operation of a germanium hole spin qubit with highly anisotropic noise sensitivity
• Micro-magnets for coherent control of spin-charge qubit in lateral quantum dots
• Counteracting systems of diabaticities using DRAG controls: The status after 10 years
• Hole spin driving by strain-induced spin-orbit interactions
• Optimized electrical control of a Si/SiGe spin qubit in the presence of an induced frequency shift
• Electric-field control and noise protection of the flopping-mode spin qubit
• Coherent spin qubit shuttling through germanium quantum dots
• Universal control of four singlet-triplet qubits
• Two-qubit logic with anisotropic exchange in a fin field-effect transistor
• A taxonomy of small Markovian errors
• Hole spin manipulation in inhomogeneous and non-separable electric fields
• The asymmetric resonant exchange qubit under the influence of electrical noise
• Universal non-adiabatic control of small-gap superconducting qubits
• Hotter is easier: unexpected temperature dependence of spin qubit frequencies
• Nonlinear response and crosstalk of electrically driven silicon spin qubits
• Bichromatic Rabi Control of Semiconductor Qubits

Cited by in corpus (35)

• Universal control of four singlet-triplet qubits
• A gate tunable transmon qubit in planar Ge
• A singlet-triplet hole-spin qubit in MOS silicon
• High-fidelity single-spin shuttling in silicon
• Blueprint for all-to-all connected superconducting spin qubits
• Coherent control of a triangular exchange-only spin qubit
• Exploiting epitaxial strained germanium for scaling low noise spin qubits at the micron-scale
• A two-dimensional 10-qubit array in germanium with robust and localised qubit control
• Modular Autonomous Virtualization System for Two-Dimensional Semiconductor Quantum Dot Arrays
• Single-step high-fidelity three-qubit gates by anisotropic chiral interactions
• Reducing disorder in Ge quantum wells by using thick SiGe barriers
• Decoherence of electron spin qubit during transfer between two semiconductor quantum dots at low magnetic fields
• beSnake: A routing algorithm for scalable spin-qubit architectures
• Optimal operation of hole spin qubits
• A spinless spin qubit
• Mitigation of exchange cross-talk in dense quantum dot arrays
• Compiling the surface code to crossbar spin qubit architectures
• A 2x2 quantum dot array in silicon with fully tuneable pairwise interdot coupling
• All-electrical operation of a spin qubit coupled to a high-Q resonator
• Polarimetry With Spins in the Solid State
• A diverse set of two-qubit gates for spin qubits in semiconductor quantum dots
• A dressed singlet-triplet qubit in germanium
• Singlet-only Always-on Gapless Exchange Qubits with Baseband Control
• Effect of disorder and strain on the operation of planar Ge hole spin qubits
• Variability of hole spin qubits in planar Germanium
• Bootstrapping, autonomous testing, and initialization system for Si/Si${}_x$Ge${}_{1-x}$ multi-quantum-dot devices
• Supercurrent and multiple Andreev reflections in Ge hut nanowire Josephson Junctions
• Micromagnet-free operation of electron spin qubits in Si/Si${}_{1-x}$Ge${}_x$ vertical double quantum dots
• Decoherence and fidelity enhancement during shuttling of entangled spin qubits
• Limitations of the $g$-tensor formalism of semiconductor spin qubits
• Dressed basis sets for the modeling of exchange interactions in double quantum dots
• Giant Rabi frequencies between qubit and excited hole states in silicon quantum dots
• Disentangling orbital and confinement contributions to $g$-factor in Ge/SiGe hole quantum dots
• Sweet-spot protection of hole spins in sparse arrays via spin-dependent magnetotunneling
• Spin qubit shuttling between coupled quantum dots with inhomogeneous Landé g-tensors