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Universal coherence protection in a solid-state spin qubit.

Kevin C Miao1, Joseph P Blanton1,2, Christopher P Anderson1,2

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Researchers developed a robust qubit using microwave dressing in silicon carbide, significantly extending coherence times. This breakthrough in quantum science offers a path to overcome decoherence challenges in quantum computing.

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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.