Efficiency of underdamped dc SQUIDs as readout devices for flux qubits

Author

Li, Shao-Xiong ; Yu, Yang ; Qiu, Wei ; Han, Siyuan ; Wang, Zhen

Author_Institution

Dept. of Phys. & Astron., Univ. of Kansas, Lawrence, KS, USA

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

982

Lastpage

985

Abstract

The flux state quantum bit (qubit) is promising for a solid state implementation of scalable quantum computing. The simplest flux state qubit consists of an rf SQUID with two fluxoid states, which can be readout with a dc SQUID - the most sensitive magnetic flux detector. Efficient readout with less back-action is desirable for quantum computing. In this work, we report measurements of the switching flux and switching current distributions of under damped dc SQUIDs. The data show that single shot readout of flux qubit with very high efficiency (>99%) can be realized using underdamped hysteretic dc SQUIDs.

Keywords

SQUIDs; quantum computing; readout electronics; 99 percent; RF SQUID; flux qubit; magnetic flux detector; quantum computing; readout device; single shot efficiency; switching current distribution; switching flux; underdamped hysteretic DC SQUID; Coupling circuits; Current distribution; Detectors; Extraterrestrial measurements; Inductance; Josephson junctions; Quantum computing; SQUIDs; Solid state circuits; Superconducting devices;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.814119

Filename

1211770