传播热微波的光子统计

Photon Statistics of Propagating Thermal Microwaves.

作者信息

Goetz J, Pogorzalek S, Deppe F, Fedorov K G, Eder P, Fischer M, Wulschner F, Xie E, Marx A, Gross R

机构信息

Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.

Physik-Department, Technische Universität München, 85748 Garching, Germany.

出版信息

Phys Rev Lett. 2017 Mar 10;118(10):103602. doi: 10.1103/PhysRevLett.118.103602. Epub 2017 Mar 8.

DOI:10.1103/PhysRevLett.118.103602

PMID:28339239

Abstract

In experiments with superconducting quantum circuits, characterizing the photon statistics of propagating microwave fields is a fundamental task. We quantify the n^{2}+n photon number variance of thermal microwave photons emitted from a blackbody radiator for mean photon numbers, 0.05≲n≲1.5. We probe the fields using either correlation measurements or a transmon qubit coupled to a microwave resonator. Our experiments provide a precise quantitative characterization of weak microwave states and information on the noise emitted by a Josephson parametric amplifier.

摘要

在超导量子电路实验中，表征传播微波场的光子统计特性是一项基本任务。我们针对平均光子数(0.05≲n≲1.5)，对从黑体辐射器发射的热微波光子的(n^{2}+n)光子数方差进行了量化。我们使用关联测量或与微波谐振器耦合的transmon量子比特来探测这些场。我们的实验提供了弱微波态的精确定量表征以及关于约瑟夫森参量放大器所发射噪声的信息。