Cross correlations between charge noise and critical-current fluctuations in a four-level tunable Josephson system

Lara Faoro; Frank W. J. Hekking

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Cross correlations between charge noise and critical-current fluctuations in a four-level tunable Josephson system

机译：四级可调约瑟夫森系统中电荷噪声与临界电流波动之间的互相关

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A protocol to test cross correlations between charge and critical-current noise in the small superconducting contacts of an asymmetric Cooper-pair transistor coupled to a phase qubit is presented. The superconducting circuit behaves as a tunable four-level quantum system that can be prepared in two different configurations where cross-correlation terms are, respectively, absent or present and therefore, in principle, detectable. The measurements of the cross correlations are performed either through the escape probability of the dc superconducting quantum interference device or a quantum-state tomography of a few elements of the reduced density matrix of the four-level quantum system.

机译：提出了一种协议，用于测试耦合至相位量子位的非对称库珀对晶体管的小型超导触点中电荷与临界电流噪声之间的互相关性。超导电路表现为可调谐的四能级量子系统，该系统可以按两种不同的配置制备，其中互不相关项分别不存在或不存在，因此原则上是可检测的。互相关的测量是通过dc超导量子干扰设备的逃逸概率或四能级量子系统的密度降低矩阵的几个元素的量子态层析成像来进行的。

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来源
《Physical review》 |2010年第5期|p.052505.1-052505.4|共4页
作者
Lara Faoro; Frank W. J. Hekking;
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作者单位

Laboratoire de Physique Theorique et Hautes Energies, CNRS UMR 7589, Universites Paris 6 et 7, 4 place Jussieu, 75252 Paris Cedex 05, France Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Rd, Piscataway, New Jersey 08854, USA LPMMC, Universite Joseph Fourier-CNRS, 25 Avenue des Martyrs, BP 166, 38042 Grenoble, France;

LPMMC, Universite Joseph Fourier-CNRS, 25 Avenue des Martyrs, BP 166, 38042 Grenoble, France;

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正文语种 eng
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josephson devices; decoherence; open systems; quantum statistical methods; electronic transport in mesoscopic systems;

机译：约瑟夫森装置;退相干开放系统;量子统计方法;介观系统中的电子传输;

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Cross correlations between charge noise and critical-current fluctuations in a four-level tunable Josephson system

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