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RSFQ based microwave controller for qubit

Raihan Rafique (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Thomas Ohki (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Henrik Engseth (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-U05.
[Konferensbidrag, övrigt]

We present a Rapid Single Flux Quantum (RSFQ) microwave controller for superconducting qubits. Applying microwaves from room temperature sources is the conventional approach to excite quantum state transitions. Finding a method to apply short microwave bursts with a narrow linewidth is a challenge for on-chip Josephson based oscillators. We present a scheme containing an RSFQ pulse generator, ultra narrowband filter, SQUID based resonator and coupler. The operating frequency of the designed controller is 3-6 GHz. The unique feature of this design is a SQUID based resonator. By varying magnetic field in the SQUID, the resonance length can be varied between λ/4 and λ/2. The resonator is added as a shunt between the filter and coupler. Transmission of microwave signals from the filter to the output is determined by the shunt resonance. RSFQ T flip-flop circuit is designed to control the magnetic field applied to the SQUID in the resonator. Miniaturization of the coupler of 2-10 GHz has been done using a quasi-lumped element designed. We present the simulations results for the frequency response of different resonance lengths of the modulator.

Denna post skapades 2007-12-28. Senast ändrad 2007-12-28.
CPL Pubid: 63952