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Measurement-free, scalable, and fault-tolerant universal quantum computing
Friederike Butt1,2, David F Locher1,2, Katharina Brechtelsbauer3
1Institute for Quantum Information, RWTH Aachen University, Aachen, Germany.
This study introduces a measurement-free quantum error correction (QEC) toolbox for universal quantum computing. It combines code switching and concatenation for robust logical gates, offering a scalable pathway for quantum processors.
Area of Science:
- Quantum Computing
- Quantum Information Science
- Error Correction
Background:
- Quantum error correction (QEC) is crucial for reliable large-scale quantum algorithms.
- Current QEC protocols often rely on error-prone measurements and feed-forward operations.
- Existing codes lack intrinsic support for universal quantum computation.
Purpose of the Study:
- To develop a fault-tolerant universal quantum computing toolbox.
- To eliminate the need for measurements during algorithm execution.
- To provide a practical and scalable solution for quantum processors.
Main Methods:
- Combining code switching and concatenation strategies.
- Developing fault-tolerant, measurement-free protocols for information transfer between 2D and 3D color codes.
- Extending the scheme to higher-distance codes via concatenation and code switching.
Main Results:
- A complete toolbox for measurement-free universal quantum computing.
- Complementary and universal sets of robust logical gates using 2D and 3D color codes.
- Fault-tolerant protocols for operations lacking native implementations.
Conclusions:
- The proposed measurement-free approach offers a practical and scalable pathway for universal quantum computing.
- This method addresses experimental demands and error rates associated with measurement-based QEC.
- Enables robust logical operations essential for advanced quantum algorithms.
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