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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
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State preservation by repetitive error detection in a superconducting quantum circuit.
J Kelly1, R Barends1, A G Fowler2
1Department of Physics, University of California, Santa Barbara, California 93106, USA.
Nature
|March 6, 2015
Summary
Researchers protected classical states from environmental errors using quantum error correction (QEC) with increasing qubit numbers. This demonstrates a scalable approach to error suppression, crucial for building robust quantum computers.
Area of Science:
- Quantum Computing
- Quantum Error Correction
Background:
- Quantum computing's viability depends on protecting quantum states from environmental errors.
- Quantum error correction (QEC) is essential for identifying and correcting errors in qubits.
- Scaling quantum systems requires robust error suppression to prevent logical failures.
Purpose of the Study:
- To demonstrate the protection of classical states from environmental bit-flip errors.
- To show the suppression of these errors with increasing system size using QEC.
- To verify the preservation of non-classical states.
Main Methods:
- Utilized a linear array of nine qubits as a step towards 2D surface code QEC.
- Employed projective quantum non-demolition parity measurements to track errors.
- Performed tomographic verification of Greenberger-Horne-Zeilinger state preservation.
Main Results:
- Reduced failure rate in retrieving an input state by a factor of 2.7 using five qubits.
- Achieved an 8.5-fold reduction in failure rate using nine qubits after eight cycles.
- Successfully verified the preservation of non-classical states.
Conclusions:
- Demonstrated effective suppression of environment-induced errors with increasing system size.
- This work provides a foundation for building large-scale superconducting quantum computers.
- Highlights the importance of QEC in overcoming experimental challenges in quantum computing.
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