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.

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Cited by in corpus (33)

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• 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