RSFQ based microwave controller for qubit
Conference contribution, 2007

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.

Author

Raihan Rafique

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Thomas Ohki

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Henrik Engseth

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Anna Yurievna Herr

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

11th International Superconducting Electronics Conference, Washington DC, USA, June 10-14, 2007.

Vol. 11 P-U05

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Other Engineering and Technologies

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10/8/2017