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Universal coherence protection in a solid-state spin qubit

Journal Article · · Science
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [2]
  1. Univ. of Chicago, IL (United States)
  2. Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  3. National Institutes for Quantum and Radiological Science and Technology, Watanuki, Takasaki (Japan)
Decoherence limits the physical realization of qubits, and its mitigation is critical for the development of quantum science and technology. In this study, we construct a robust qubit embedded in a decoherence-protected subspace, obtained by applying microwave dressing to a clock transition of the ground-state electron spin of a silicon carbide divacancy defect. The qubit is universally protected from magnetic, electric, and temperature fluctuations, which account for nearly all relevant decoherence channels in the solid state. This culminates in an increase of the qubit’s inhomogeneous dephasing time by more than four orders of magnitude (to >22 milliseconds), while its Hahn-echo coherence time approaches 64 milliseconds. Requiring few key platform-independent components, this result suggests that substantial coherence improvements can be achieved in a wide selection of quantum architectures.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Defense Advanced Research Projects Agency (DARPA); Japan Society for the Promotion of Science (JSPS); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); US Department of the Navy, Office of Naval Research (ONR); USDOD; USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1674973
Journal Information:
Science, Journal Name: Science Journal Issue: 6510 Vol. 369; ISSN 0036-8075
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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