Quiet readout of superconducting flux states

被引：23

作者：

Clarke, J ^{[1
]}

Robertson, TL

Plourde, BLT

García-Martinez, A

Reichardt, PA

Van Harlingen, DJ

Chesca, B

Kleiner, R

Makhlin, Y

Schön, G

Shnirman, A

Wilhelm, FK

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Sci Mat, Berkeley, CA 94720 USA

[3] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[4] Univ Tubingen, Phys Inst Expt Phys 2, D-72076 Tubingen, Germany

[5] Univ Karlsruhe, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany

[6] Univ Munich, Sekt Phys, D-80333 Munich, Germany

[7] Univ Munich, CeNs, D-80333 Munich, Germany

来源：

PHYSICA SCRIPTA | 2002年 / T102卷

关键词：

D O I：

10.1238/Physica.Topical.102a00173

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The INSQUID (INductive Superconducting QUantum Interference Device) can measure the flux state of a superconducting qubit rapidly, while allowing the quantum state of the qubit to evolve with low levels of back action. The INSQUID consists of a dc SQUID with unshunted junctions connected in parallel with a superconducting inductor: the qubit is placed inside the SQUID loop. The inductor is coupled to a readout dc SQUID with resistively-shunted junctions. By applying appropriate fluxes to the input SQUID and the inductor., the INSQUID can be turned "off", so that virtually no flux noise is coupled from the readout SQUID to the qubit. Different flux biases turn the INSQUID "on", enabling the readout SQUID to measure the flux state of the qubit. The INSQUID can also be used to turn on and off the coupling between two or more qubits.

引用

页码：173 / 177

页数：5

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