Publisher's Note: Microwave-Induced Thermal Escape in Josephson Junctions [Phys. Rev. Lett.<b>93</b>, 107002 (2004)]

Grønbech‐Jensen, Niels; Castellano, M. G.; Chiarello, F.; Cirillo, M.; Cosmelli, C.; Filippenko, L. V.; Russo, R.; Torrioli, G.

doi:10.1103/physrevlett.93.119901

Cited by 32 publications

(55 citation statements)

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“…It is important to note that such trend is basically opposite to that reported in the previous work where W ϰ i mw 2 is smaller and bifurcation is not involved. 17,18 The rapid narrowing of the peak can also be explained by our model. To demonstrate this, we plot in Fig.…”

Section: Results At = 70 Ghz and Further Discussionmentioning

confidence: 87%

Quantum and classical resonant escapes of a strongly driven Josephson junction

Zhu

Peng

et al. 2010

Phys. Rev. B

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The properties of phase escape in a dc superconducting quantum interference device ͑SQUID͒ at 25 mK, which is well below quantum-to-classical crossover temperature T cr , in the presence of strong resonant ac driving have been investigated. The SQUID contains two Nb/ Al-AlO x / Nb tunnel junctions with Josephson inductance much larger than the loop inductance so it can be viewed as a single junction having adjustable critical current. We find that with increasing microwave power W and at certain frequencies and / 2, the single primary peak in the switching current distribution, which is the result of macroscopic quantum tunneling of the phase across the junction, first shifts toward lower bias current I and then a resonant peak develops. These results are explained by quantum resonant phase escape involving single and two photons with microwave-suppressed potential barrier. As W further increases, the primary peak gradually disappears and the resonant peak grows into a single one while shifting further to lower I. At certain W, a second resonant peak appears, which can locate at very low I depending on the value of . Analysis based on the classical equation of motion shows that such resonant peak can arise from the resonant escape of the phase particle with extremely large oscillation amplitude resulting from bifurcation of the nonlinear system. Our experimental result and theoretical analysis demonstrate that at T Ӷ T cr , escape of the phase particle could be dominated by classical process, such as dynamical bifurcation of nonlinear systems under strong ac driving.

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Section: Results At = 70 Ghz and Further Discussionmentioning

confidence: 87%

Quantum and classical resonant escapes of a strongly driven Josephson junction

Zhu

Peng

et al. 2010

Phys. Rev. B

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“…9 Ã and to sweep much more slowly in the second region. However, apart some indications [30], a careful analysis of the consequences of the bias sweep on JJ detectors is at the moment still lacking. We remark that constant bias with an external clock allows time resolution down to nanoseconds and the range spans over six orders of magnitude [55].…”

Section: Practical Issues For Josephson Junction Detectorsmentioning

confidence: 99%

“…Moreover, it has been argued that several phenomena that are characteristic of quantum behavior could be reproduced by a classical model such as Eq. ( 2) through an appropriate choice of the temperature [14,30,31,11]. We suggest that even in the case when the temperature of the junction is not certainly known, for example if the thermal contact with the bath is not perfect, the analysis of the full PDF with the methods of signal theory, rather than just compare the average escape time [11], could give indications for the correct model.…”

Section: Practical Issues For Josephson Junction Detectorsmentioning

confidence: 99%

Escape Time of Josephson Junctions for Signal Detection

Addesso

Филатрелла

Pierro

2012

Progress in Optical Science and Photonics

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In this Chapter we investigate with the methods of signal detection the response of a Josephson junction to a perturbation to decide if the perturbation contains a coherent oscillation embedded in the background noise. When a Josephson Junction is irradiated by an external noisy source, it eventually leaves the static state and reaches a steady voltage state. The appearance of a voltage step allows to measure the time spent in the metastable state before the transition to the running state, thus defining an escape time. The distribution of the escape times depends upon the characteristics of the noise and the Josephson junction. Moreover, the properties of the distribution depends on the features of the signal (amplitude, frequency and phase), which can be therefore inferred through the appropriate signal processing methods. Signal detection with JJ is interesting for practical purposes, inasmuch as the superconductive elements can be (in principle) cooled to the absolute zero and therefore can add (in practice) as little intrinsic noise as refrigeration allows. It is relevant that the escape times bear a hallmark of the noise itself. The spectrum of the fluctuations due to the intrinsic classical (owed to thermal or environmental disturbances) or quantum (due to the tunnel across the barrier) sources are different. Therefore, a careful analysis of the escape times could also assist to discriminate the nature of the noise.

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“…Besides the general interest in FPT, there is an additional reason to pay a special attention to JJ. The well established [21] noisy dynamics of Josephson junctions is of great contemporary interest [7,[22][23][24] in connection with macroscopic quantum tunneling [25][26][27][28][29][30][31][32]. The quantum behavior of JJ makes them a good candidate for the realization of a quantum bit; however, the quantum regime is only observed after the ordinary thermal activated regime has been tamed [33].…”

Section: The Physical Problemmentioning

confidence: 99%

Stochastic first passage time accelerated with CUDA

Pierro

Troiano

Mejuto

et al. 2018

Journal of Computational Physics

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The numerical integration of stochastic trajectories to estimate the time to pass a threshold is an interesting physical quantity, for instance in Josephson junctions and atomic force microscopy, where the full trajectory is not accessible. We propose an algorithm suitable for efficient implementation on graphical processing unit in CUDA environment. The proposed approach for well balanced loads achieves almost perfect scaling with the number of available threads and processors, and allows an acceleration of about 400× with a GPU GTX980 respect to standard multicore CPU. This method allows with off the shell GPU to challenge problems that are otherwise prohibitive, as thermal activation in slowly tilted potentials. In particular, we demonstrate that it is possible to simulate the switching currents distributions of Josephson junctions in the timescale of actual experiments.

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Publisher's Note: Microwave-Induced Thermal Escape in Josephson Junctions [Phys. Rev. Lett.93, 107002 (2004)]

Cited by 32 publications

References 0 publications

Quantum and classical resonant escapes of a strongly driven Josephson junction

Quantum and classical resonant escapes of a strongly driven Josephson junction

Escape Time of Josephson Junctions for Signal Detection

Stochastic first passage time accelerated with CUDA

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