Fault-tolerant detection of a quantum error
S Rosenblum1,2, P Reinhold3,2, M Mirrahimi2,4
1Departments of Applied Physics and Physics, Yale University, New Haven, CT 06511, USA. serge.rosenblum@yale.edu.
Science (New York, N.Y.)
|July 21, 2018
Summary
This study presents a fault-tolerant method to prevent errors from spreading from ancilla systems to logical qubits in quantum error correction. This technique improves quantum computation reliability by suppressing ancilla errors and increasing qubit coherence.
Area of Science:
- Quantum Information Science
- Quantum Computing
- Quantum Error Correction
Background:
- Quantum error correction relies on ancilla systems for error detection.
- Errors in ancilla systems can propagate to logical qubits, corrupting quantum information.
Purpose of the Study:
- To demonstrate a fault-tolerant error-detection scheme to suppress ancilla error propagation.
- To enhance the performance and reliability of quantum computations.
Main Methods:
- Utilized a hardware-efficient approach with a single multilevel transmon ancilla and a cavity-encoded logical qubit.
- Engineered qubit-ancilla interaction using an off-resonant sideband drive.
Main Results:
- Suppressed the spreading of ancilla errors by a factor of 5 while maintaining assignment fidelity.
- Prevented ancilla excitation propagation, increasing logical qubit dephasing time by an order of magnitude.
Conclusions:
- Hardware-efficient strategies leveraging system-specific error models are crucial for advancing fault-tolerant quantum computation.
- The demonstrated scheme offers a practical path toward robust quantum information processing.
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