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SQUIDs as tunable inductors integrated in the design of filters

Raihan Rafique (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Thomas Ohki (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Anna Herr (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
11th International Superconducting Electronics Conference, Washington DC, USA, June 10-14, 2007. Vol. 11 (2007), p. P-V06.
[Konferensbidrag, övrigt]

This work presents the dc-SQUID based tunable inductance and its relevance into the design of resonators and filters for the qubit application. The SQUID inductance depends on loop inductance, applied magnetic field and bias current for a given thermal noise. Tunable resonators and filters have been designed by replacing the inductances of the resonator with a chain of SQUIDs in series. A narrow bandpass filter with variable central frequency is useful for superconducting qubit applications, specifically for improving the line widths of Josephson junction oscillators. We have designed a tunable 3.5 GHz resonator and 2 GHz 7 stage Chebyshev filters to be fabricated in Hypres 4.5 kA/cm2 process. According to simulations, up to 50% of the operating frequency of the designed filter can be varied. We present data that shows a frequency tuning of >2 GHz.

Denna post skapades 2007-12-28.
CPL Pubid: 63960


Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik


Teknisk fysik

Chalmers infrastruktur