Magnetic flux noise in the three Josephson junctions superconducting ring

Автор(и)

  • E. Il’ichev Institute of Photonic Technology, 9 Albert-Einstein Str., 07745, Jena, Germany
  • A.N. Omelyanchouk B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine

DOI:

https://doi.org/10.1063/1.2920076

Ключові слова:

Josephson junction, SQUID, flux qubit, thermal fluctuations.

Анотація

We analyze the influence of noise on magnetic properties of a superconducting loop which contains three Josephson junctions. This circuit is a classical analog of a persistent current (flux) qubit. A loop supercurrent induced by external magnetic field at the presence of thermal fluctuations is calculated. In order to get connection with experiment we calculate the impedance of the low-frequency tank circuit which is inductively coupled with a loop of interest. We compare obtained results with the results in quantum mode — when the three junction loop exhibits quantum tunneling of the magnetic flux. We demonstrate that the tank-loop impedance in the classical and quantum modes have different temperature dependence and can be easily distinguished experimentally.

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Опубліковано

2008-04-18

Як цитувати

(1)
Il’ichev, E.; Omelyanchouk, A. Magnetic Flux Noise in the Three Josephson Junctions Superconducting Ring. Fiz. Nizk. Temp. 2008, 34, 520-524.

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Розділ

Надпровідність, зокрема високотемпературна

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