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Updated: Sep 28, 2025
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
Published on: June 3, 2015
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Two-qubit silicon quantum processor with operation fidelity exceeding 99
Adam R Mills1, Charles R Guinn1, Michael J Gullans1,2
1Department of Physics, Princeton University, Princeton, NJ 08544, USA.
Science Advances
|April 6, 2022
Summary
High-fidelity quantum operations were achieved in silicon spin qubits, a crucial step for quantum error correction. This breakthrough demonstrates the potential of silicon for building powerful quantum processors.
Area of Science:
- Quantum computing
- Solid-state physics
- Quantum information science
Background:
- Silicon spin qubits are promising for quantum information processing.
- Previous research lacked demonstrations of high-fidelity state preparation, readout, and multi-qubit gates necessary for quantum error correction.
Purpose of the Study:
- To demonstrate high-fidelity state preparation and readout.
- To achieve high-fidelity single- and two-qubit gates.
- To quantitatively characterize a two-qubit Si/SiGe quantum processor.
Main Methods:
- Utilized a two-qubit silicon-germanium (Si/SiGe) quantum processor.
- Employed gate set tomography and randomized benchmarking for quantitative characterization.
Main Results:
- Achieved state preparation and readout fidelity greater than 97%.
- Demonstrated single- and two-qubit gate fidelities exceeding 99%.
- Quantitatively validated processor performance.
Conclusions:
- Silicon spin qubits show significant potential for quantum error correction.
- The demonstrated fidelities pave the way for developing intermediate-scale quantum processors.
- Silicon-based quantum technology is a leading candidate for future quantum computers.
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