High fidelity state preparation, quantum control, and readout of an isotopically enriched silicon spin qubit

Abstract

Quantum systems must be prepared, controlled, and measured with high fidelity in order to perform complex quantum algorithms. Control fidelities have greatly improved in silicon spin qubits, but state preparation and readout fidelities have generally been poor. By operating with low electron temperatures and employing high-bandwidth cryogenic amplifiers, we demonstrate single qubit readout visibilities >99%, exceeding the threshold for quantum error correction. In the same device, we achieve average single qubit control fidelities >99.95%. Our results show that silicon spin qubits can be operated with high overall operation fidelity.

References in corpus (18)

• Surface codes: Towards practical large-scale quantum computation
• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• Randomized Benchmarking of Quantum Gates
• Robust randomized benchmarking of quantum processes
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Computing with spin qubits at the surface code error threshold
• Fast universal quantum control above the fault-tolerance threshold in silicon
• Universal control of a six-qubit quantum processor in silicon
• Two-qubit silicon quantum processor with operation fidelity exceeding 99%
• Scalable gate architecture for densely packed semiconductor spin qubits
• Fast Single-Charge Sensing with an rf Quantum Point Contact
• A Reconfigurable Gate Architecture for Si/SiGe Quantum Dots
• Randomized Benchmarking of Multi-Qubit Gates
• A flexible design platform for Si/SiGe exchange-only qubits with low disorder
• A cryogenic amplifier for fast real-time detection of single-electron tunneling
• Site-selective quantum control in an isotopically enriched 28Si/SiGe quadruple quantum dot
• Fast and high-fidelity state preparation and measurement in triple-quantum-dot spin qubits

Cited by in corpus (33)

• Semiconductor Spin Qubits
• High-fidelity operation and algorithmic initialisation of spin qubits above one kelvin
• Low charge noise quantum dots with industrial CMOS manufacturing
• Spatial noise correlations beyond nearest-neighbor in ${}^{28}$Si/SiGe spin qubits
• Fast, high-fidelity addressed single-qubit gates using efficient composite pulse sequences
• Hotter is easier: unexpected temperature dependence of spin qubit frequencies
• Rapid single-shot parity spin readout in a silicon double quantum dot with fidelity exceeding 99 %
• Gate-tunable kinetic inductance parametric amplifier
• Spin-Valley Protected Kramers Pair in Bilayer Graphene
• Feedback-based active reset of a spin qubit in silicon
• Scalable on-chip multiplexing of silicon single and double quantum dots
• Single spin qubit geometric gate in a silicon quantum dot
• Valley-Free Silicon Fins Caused by Shear Strain
• Cross-architecture Tuning of Silicon and SiGe-based Quantum Devices Using Machine Learning
• How to cross an energy barrier at zero Kelvin without tunneling effect
• Spin-Orbit Interaction Enabled High-Fidelity Two-Qubit Gates
• Tailoring potentials by simulation-aided design of gate layouts for spin qubit applications
• Theory of charge stability diagrams in coupled quantum dot qubits
• Quantum estimation and remote charge sensing with a hole-spin qubit in silicon
• Multi-qubit DC gates over an inhomogeneous array of quantum dots
• A SWAP Gate for Spin Qubits in Silicon
• Electrical Interconnects for Silicon Spin Qubits
• Fast time-domain current measurement for quantum dot charge sensing using a homemade cryogenic transimpedance amplifier
• Limitations of the $g$-tensor formalism of semiconductor spin qubits
• Achieving fast and robust perfect entangling gates via reinforcement learning
• Spin-qubit readout analysis based on a hidden Markov model
• Comparison of spin-qubit architectures for quantum error-correcting codes
• Robust composite two-qubit gates for silicon-based spin qubits
• Interplay of Pauli blockade with electron-photon coupling in quantum dots
• Robust iSWAP gates for semiconductor spin qubits with local driving
• Four-state discrimination for a pair of spin qubits via gate reflectometry
• Enhanced local addressability of a spin array with local exchange pulses and global microwave driving
• Limits of Classical correlations and Quantum advantages under (Anti-)Distinguishability constraints in Multipartite Communication