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Universal logical operations in a silicon quantum processor
Chunhui Zhang1,2, Feng Xu1,2, Shihang Zhang1,2
1International Quantum Academy, Shenzhen, China.
Nature Nanotechnology
|March 24, 2026
Summary
Researchers demonstrate a logical quantum processor in silicon, a crucial step for fault-tolerant quantum computation. This work enables logical operations on qubits, paving the way for scalable quantum computers.
Area of Science:
- Quantum Computing
- Condensed Matter Physics
- Materials Science
Background:
- Environmental noise causes quantum errors, hindering practical quantum computation.
- Fault-tolerant quantum computation uses logical qubits to mitigate errors.
- Silicon quantum computers have advanced, but logical operations remain unrealized.
Purpose of the Study:
- To demonstrate a logical quantum processor in silicon.
- To realize essential components for fault-tolerant logical operations.
- To advance scalable quantum computation using silicon spin qubits.
Main Methods:
- Implemented the [[4, 2, 2]] quantum error-correcting code.
- Developed fault-tolerant preparation of logical qubit states.
- Characterized a universal set of logical single- and two-qubit gates.
Main Results:
- Demonstrated a logical quantum processor using a phosphorus donor cluster in silicon.
- Achieved a logical T gate via the gate-by-measurement method and prepared magic states.
- Executed the variational quantum eigensolver algorithm on two logical qubits, simulating H2O's ground state.
Conclusions:
- This work represents a significant advancement towards scalable, fault-tolerant quantum computation in silicon.
- The demonstrated logical operations are essential for building practical quantum computers.
- The results validate silicon spin qubits as a promising platform for future quantum technologies.
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