Josephson Directional Amplifier for Quantum Measurement of Superconducting Circuits

被引：84

作者：

Abdo, Baleegh ^{[1
]}

Sliwa, Katrina ^{[1
]}

Shankar, S. ^{[1
]}

Hatridge, Michael ^{[1
]}

Frunzio, Luigi ^{[1
]}

Schoelkopf, Robert ^{[1
]}

Devoret, Michel ^{[1
]}

机构：

[1] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 16期

关键词：

NOISE;

D O I：

10.1103/PhysRevLett.112.167701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We realize a microwave quantum-limited amplifier that is directional and can therefore function without the front circulator needed in many quantum measurements. The amplification takes place in only one direction between the input and output ports. Directionality is achieved by multipump parametric amplification combined with wave interference. We have verified the device noise performances by using it to read out a superconducting qubit and observed quantum jumps. With an improved version of this device, the qubit and preamplifer could be integrated on the same chip.

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页数：5

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