Lévy noise effects on Josephson junctions

Guarcello, Claudio

doi:10.1016/j.chaos.2021.111531

Cited by 23 publications

(7 citation statements)

References 162 publications

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“…Next steps will be investigation of 3WM and RPM configurations to closely reproduce experimental results and understand sources of nonidealities. The effects of intrinsic fluctuations in JJs, which are important in determining their switching [46][47] [48], and their combined effect with the nonlinear dynamics will also be addressed as possible source of additional noise. Moreover, other schemes can be explored, for instance including two JJs in parallel in the rf-SQUID to achieve higher operation frequencies in "optical modes" [49].…”

Section: Resultsmentioning

confidence: 99%

Modeling of Josephson Traveling Wave Parametric Amplifiers

Guarcello

Avallone

Barone

et al. 2023

IEEE Trans. Appl. Supercond.

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Recent advancements in quantum technologies and advanced detection experiments have underscored the pressing need for the detection of exceedingly weak signals within the microwave frequency spectrum. Addressing this challenge, the Josephson Traveling Wave Parametric Amplifier (JTWPA) has been proposed as a cryogenic front-end amplifier capable of approaching the quantum noise limit while providing a relevant bandwidth. This research is centered on a comprehensive numerical investigation of the JTWPA, without resorting to simplifications regarding the nonlinearity of the essential components. Specifically, this study focuses on a thorough examination of the system, characterized by coupled nonlinear differential equations representing all components of the device. Proper input and output signals at the device's boundaries are considered. The analysis of the output signals undergoing the parametric amplification process involves a detailed exploration of phase-space dynamics and Fourier spectral analysis of the output voltage. This study is conducted while considering the parameters ruling the response of the device under pump and signal excitations. In addition to the expected signal amplification, the findings reveal that the nonlinear nature of the system can give rise to unforeseen phenomena, depending on the system's Manuscript receipt and acceptance dates will be inserted here.

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Section: Resultsmentioning

confidence: 99%

Modeling of Josephson Traveling Wave Parametric Amplifiers

Guarcello

Avallone

Barone

et al. 2023

IEEE Trans. Appl. Supercond.

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“…This maximum possible critical current is difficult to achieve in real junctions. In our opinion, the most reliable way to determine the critical current is to compare the experimental lifetime as a function of the current with the lifetime calculated using numerical simulations [39][40][41] in the frame of the resistively-capacitively shunted junction (RCSJ) model with additive noise [29]. It is important to use the RCSJ model in the temperature range in which it is valid, that is, above the crossover temperature in the quantum regime.…”

Section: Resultsmentioning

confidence: 99%

Approaching microwave photon sensitivity with Al Josephson junctions

Pankratov¹,

Gordeeva²,

Revin³

et al. 2022

Beilstein J. Nanotechnol.

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Here, we experimentally test the applicability of an aluminium Josephson junction of a few micrometers size as a single photon counter in the microwave frequency range. We have measured the switching from the superconducting to the resistive state through the absorption of 10 GHz photons. The dependence of the switching probability on the signal power suggests that the switching is initiated by the simultaneous absorption of three and more photons, with a dark count time above 0.01 s.

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“…This is documented by looking at both the frequency domain and the localization of energy. Furthermore, a nonmonotonic behavior of an average characteristic time for the breather as a function of the noise intensity is found, which is a manifestation of the so-called noise-enhanced stability effect [38,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64].…”

Section: Introductionmentioning

confidence: 95%

Breather dynamics in a stochastic sine-Gordon equation: evidence of noise-enhanced stability

Santis¹,

Guarcello²,

Spagnolo³

et al. 2022

Preprint

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The dynamics of sine-Gordon breathers is studied in the presence of dissipative and stochastic perturbations. Taking a stationary breather with a random phase value as the initial state, the performed simulations demonstrate that a spatially-homogeneous noisy source can make the oscillatory excitation more stable, i.e., it enables the latter to last significantly longer than it would in a noise-free scenario. Both the frequency domain and the localization of energy are examined to document the effectiveness of the noise-enhanced stability phenomenon, which emerges as a nonmonotonic behavior of an average characteristic time for the breather as a function of the noise intensity. The influence of the mode's starting frequency on the results and their robustness against an additional thermal background are also addressed.

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Lévy noise effects on Josephson junctions

Cited by 23 publications

References 162 publications

Modeling of Josephson Traveling Wave Parametric Amplifiers

Modeling of Josephson Traveling Wave Parametric Amplifiers

Approaching microwave photon sensitivity with Al Josephson junctions

Breather dynamics in a stochastic sine-Gordon equation: evidence of noise-enhanced stability

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