Universal coherence protection in a solid-state spin qubit

Area of Science:

• Quantum computing
• Solid-state physics
• Quantum information science

Background:

• Decoherence is a major obstacle in building functional quantum computers.
• Existing qubits are vulnerable to environmental noise like magnetic fields, electric fields, and temperature variations.

Purpose of the Study:

• To create a qubit with enhanced robustness against decoherence.
• To demonstrate a method for significantly increasing qubit coherence times.

Main Methods:

• Engineered a qubit within a decoherence-protected subspace using microwave dressing.
• Utilized a clock transition of the ground-state electron spin of a silicon carbide divacancy defect.
• Investigated protection against magnetic, electric, and temperature fluctuations.

Main Results:

• Achieved a >4-orders-of-magnitude increase in inhomogeneous dephasing time (to >22 ms).
• Reached a Hahn-echo coherence time approaching 64 ms.
• Demonstrated universal protection against major decoherence channels in solid-state systems.

Conclusions:

• The developed qubit design offers substantial coherence improvements.
• The platform-independent approach is applicable to various quantum architectures.
• This work advances the development of practical quantum technologies.