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An On-Chip Mach-Zehnder Interferometer in the Microwave Regime

Steven Schuermans (Institutionen för mikroteknologi och nanovetenskap) ; Michael Simoen (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Martin Sandberg (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Philip Krantz (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Christopher Wilson (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Per Delsing (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
IEEE Transactions on Applied Superconductivity (1051-8223). Vol. 21 (2011), 3, p. 448-451.
[Artikel, refereegranskad vetenskaplig]

The design, simulation and measurements of an on-chip Mach-Zehnder interferometer operating in the microwave regime are described. Using microwave signals in microfabricated superconducting Al waveguides, the concept of an interferometer is transferred from optics to on-chip. Tuning of the path length of one of the interferometer arms is executed through the tunable inductance of a SQUID. By placing one or more SQUIDs in the waveguide structure and by varying the magnetic flux through the SQUID loop, the total SQUID inductance can be tuned. In this way, a phase difference leading to destructive or constructive interference at the interferometer output can be achieved. Thorough software simulations were performed to determine the different design parameters, assign a desired working frequency and provide a reference for comparison with experimental results. Measurements at 300 mK show an effective working frequency close to the simulations, with a deviation smaller than 0.05 GHz. The behavior of the interferometer is very similar to the simulations as well. The on-off ratio exceeds 40 dB.

Nyckelord: CPW, Mach-Zehnder interferometer, optics on-chip, superconductivity



Denna post skapades 2011-06-30.
CPL Pubid: 142775

 

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