Comparing optical-microwave conversion and all-microwave control schemes for a transmon qubit

  1. Volodymyr Monarkha,
  2. Massimo Borrelli,
  3. Reza Hajitashakkori Kenari,
  4. Mohammad Kobba,
  5. Eugenio Cataldo,
  6. Beer de Zoeten,
  7. Mahnaz Zarrinfar,
  8. Kamal Pandey,
  9. Abhinand Pusuluri,
  10. Filippo D. Michelacci,
  11. Eliot Jouan,
  12. Bennett Sprague,
  13. Simon Gröblacher,
  14. Thierry C. van Thiel,
  15. Robert Stockill,
  16. and Russell E. Lake
We report a comparative study on transmon qubit control using (i) conventional attenuated coaxial microwave line and (ii) an optical control system using modulated laser light delivered over telecommunications optical fiber to a photodiode located at the 1K stage of a dilution cryostat. During each experiment, we performed repeated measurements of the energy relaxation and coherence times of a transmon qubit using one of the control signal delivery methods. Each measurement run spanned 20 hours of measurement time and from these datasets we observe no measurable effect on coherence of the qubit compared to random coherence fluctuations. Our results open up the possibility of large scale integration of the optical qubit control system.
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