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Title: Optimal coupling of Ho W10 molecular magnets to superconducting circuits near spin clock transitions

Journal Article · · Physical Review Applied
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [5];  [4]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]; ORCiD logo [10];  [4]; ORCiD logo [3]
  1. CSIC-University of Zaragoza (Spain); Universidad de Zaragoza (Spain); National High Magnetic Field Laboratory
  2. CSIC-University of Zaragoza (Spain); Universidad de Zaragoza (Spain); University of Science and Technology of China, Hefei (China); University of Science and Technology of China, Shanghai (China)
  3. CSIC-University of Zaragoza (Spain); Universidad de Zaragoza (Spain)
  4. Universidad de Valencia, Paterna (Spain)
  5. Centro de Astrobiología (CSIC-INTA), Madrid (Spain)
  6. Universidad de Zaragoza (Spain)
  7. TU Wien, Vienna (Austria)
  8. IMDEA Nanociencia, Madrid (Spain)
  9. Florida State University, Tallahassee, FL (United States)
  10. University of Science and Technology of China, Hefei (China); University of Science and Technology of China, Shanghai (China)

A central goal in quantum technologies is to maximize GT2, where G stands for the coupling of a qubit to control and readout signals and T2 is the qubit’s coherence time. Furthermore, this is challenging, as increasing G (e.g., by coupling the qubit more strongly to external stimuli) often leads to deleterious effects on T2. Here, we study the coupling of pure and magnetically diluted crystals of Ho W10 magnetic clusters to microwave superconducting coplanar waveguides. Absorption lines give a broadband picture of the magnetic energy level scheme and, in particular, confirm the existence of level anticrossings at equidistant magnetic fields determined by the combination of crystal field and hyperfine interactions. Such “spin clock transitions” are known to shield the electronic spins against magnetic field fluctuations. The analysis of the microwave transmission shows that the spin-photon coupling also becomes maximum at these transitions. The results show that engineering spin-clock states of molecular systems offers a promising strategy to combine sizable spin-photon interactions with a sufficient isolation from unwanted magnetic noise sources.

Research Organization:
Florida State University, Tallahassee, FL (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0020260
OSTI ID:
2305530
Journal Information:
Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 4 Vol. 20; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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