An RSFQ variable duty cycle oscillator for driving a superconductive qubit

Author

Crankshaw, Donald S. ; Habif, Jonathan L. ; Zhou, Xingxiang ; Orlando, Terry P. ; Feldman, Marc J. ; Bocko, Mark F.

Author_Institution

Massachusetts Inst. of Technol., Cambridge, MA, USA

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

966

Lastpage

969

Abstract

We design an RSFQ oscillator with a variable duty cycle to drive a superconductive qubit. This design has been optimized to minimize the decoherence when coupled to the superconductive persistent current qubit. A continuous RSFQ ring oscillator reads the contents of a Non-Destructive Read Out memory cell. By using two out-of-phase counters to Set and Reset the cell, we can vary the duty cycle of the pulses read from the memory cell. This train of flux quanta is filtered, then used to drive the persistent current qubit. The precision is sufficient to measure relaxation time and possibly Rabi oscillations.

Keywords

nondestructive readout; oscillators; persistent currents; quantum computing; superconducting integrated circuits; RSFQ ring oscillator; Rabi oscillation; decoherence; nondestructive read out memory cell; persistent current; quantum computation; relaxation time; superconductive qubit; variable duty cycle; Clocks; Counting circuits; Foundries; Integrated circuit technology; Josephson junctions; Laboratories; Persistent currents; Quantum computing; Ring oscillators; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.814115

Filename

1211766