Superconducting multiple loop quantum interferometers

Oppenländer, J.; Träuble, T.; Häussler, Ch.; Schopohl, N.

doi:10.1109/77.919581

Cited by 47 publications

(33 citation statements)

References 5 publications

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“…Typical experimental values for the transfer factor of bare 1D parallel arrays ͑with Nϭ30) are of the order of T N Ϸ10 2 Ϫ10 3 V/T. 18 As can be derived from Eq. ͑33͒ the transfer factor scales with the number N of junctions in the array, so that T N can be increased with N. Using additional flux-focusing structures, e.g., superconducting pickup loops, the transfer factor can be further increased by several orders of magnitudes up to T N Ϸ10 6 V/T.…”

Section: ͑25͒mentioning

confidence: 99%

Electromagnetomotive force fields in noninertial reference frames and accelerated superconducting quantum interferometers

et al. 2001

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We discuss the prospects of detecting with high precision the force fields related to noninertiality in superconducting circuits. Special emphasis is laid on the perfectly conducting and perfect diamagnetism analogues of the Tolman-Stewart and Barnett effects, respectively. The influence of acceleration and rotation on the electrodynamics of superconducting interferometers is explicitly described. In particular, we show how motion induced changes of the oscillation frequency of the local Josephson oscillators in superconducting quantum interference filters can be used for precision measurements of acceleration in free space.

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Section: ͑25͒mentioning

confidence: 99%

Electromagnetomotive force fields in noninertial reference frames and accelerated superconducting quantum interferometers

et al. 2001

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“…Their key element is a thin and narrow superconducting strip and the often used vivid model description of the detection mechanism involves the creation of a hot-spot: Upon absorption of a photon by a Cooper-pair a highly excited unpaired electron is created 1 . For visible to near-infrared photons and absorption in conventional superconductors the excitation energy will be 2 to 3 orders of magnitude higher than the superconducting energy gap 2∆.…”

Section: Superconducting Single-photon Detectormentioning

confidence: 99%

“…With the ongoing progress in miniaturization of superconducting electronic devices, superconducting quantum interference devices [1], quantum computing [2] and quantum detectors [3] are mentioned as examples, fluctuations become more and more important for their overall performance. In order to be competitive in comparison to their semiconducting counterparts a very low noise level is paramount.…”

Section: Introductionmentioning

confidence: 99%

Fluctuations and dark count rates in superconducting NbN single‐photon detectors

Engel

Semenov

Hübers

et al. 2005

phys. stat. sol. (c)

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PACS 74.40.+k, 74.78.Na, 85.25.Oj We measured the temperature-and current-dependence of dark count rates of a superconducting singlephoton detector. The detector's key element is a 84 nm wide meander strip line fabricated from a 5 nm thick NbN film. Due to its reduced dimensions various types of fluctuations can cause temporal and localized transitions into a resistive state leading to dark count events. Adopting a recent refinement of the hotspot model we achieve a satisfying description of the experimental dark count rates taking into account fluctuations of the Cooper-pair density and current-assisted unbinding of vortex-antivortex pairs.1 Introduction As the size and dimensions of a physical system are reduced, it is a well-known general trend that fluctuations play an increasingly important role. With the ongoing progress in miniaturization of superconducting electronic devices, superconducting quantum interference devices [1], quantum computing [2] and quantum detectors [3] are mentioned as examples, fluctuations become more and more important for their overall performance. In order to be competitive in comparison to their semiconducting counterparts a very low noise level is paramount. In this paper we present measurements of the temperatureand current-dependence of dark count rates for a superconducting single-photon counter and discuss these results with respect to fluctuations of the Cooper-pair density and the current-assisted unbinding of vortexantivortex pairs related to the Berezinskii-Kosterlitz-Thouless (BKT) transition in thin superconducting films. A key element that allows us to include fluctuations in the superconducting order parameter is a recent refinement of the commonly used hot-spot model [4] to describe these detectors.

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“…This property may be used to create a sensitive absolute field magnetometer that is called superconducting quantum interference filter ͑SQIF͒. [23][24][25][26][27] So far, these SQIFs are based on usual JJs. However, recently it was also suggested to realize 0-SQIFs, using constriction junctions in d-wave superconductors.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Josephson junctions with steplike interface transparency

et al. 2009

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Within the framework of the quasiclassical Usadel equations we study the Josephson effect in superconductor-insulator-ferromagnet-superconductor ͑SIFS͒ and SIFNS ͑N is a normal metal͒ structures with a steplike transparency of the FS or NS interface. At certain parameters the steplike transparency leads to the formation of a region, where the critical current-density distribution J C ͑y͒ along the junction exhibits a damped oscillation with a sign change. This results in the formation of a 0-nanojunction with the characteristic length of 0 and regions of the order of the coherence length F for SIFS and N for SIFNS junctions, respectively. Using several transparency steps one can create an array of nanojunctions. Such structures exhibit an unusual behavior in an external magnetic field H. The total critical current grows with increasing H up to a certain value, which depends on the size of a single nanojunction, and has multiperiodic oscillations in the case of an array.

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Superconducting multiple loop quantum interferometers

Cited by 47 publications

References 5 publications

Electromagnetomotive force fields in noninertial reference frames and accelerated superconducting quantum interferometers

Electromagnetomotive force fields in noninertial reference frames and accelerated superconducting quantum interferometers

Fluctuations and dark count rates in superconducting NbN single‐photon detectors

Ferromagnetic Josephson junctions with steplike interface transparency

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