Phase Dynamics and Macroscopic Quantum Tunneling

Massarotti, Davide; Tafuri, F.

doi:10.1007/978-3-030-20726-7_11

Cited by 4 publications

(1 citation statement)

References 150 publications

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“…MQT was revealed in the most unfavorable configuration, for a BP junction with a lobe of the OP facing a node, thus in presence of low energy quasi-particles. The escape rate of the superconducting phase ϕ from a local minimum in the washboard potential into the running state as a function of temperature was studied using the same techniques as MQT experiments on low-T C junctions [12,13,24]. The switching current probability distributions as a function of temperature substantially follows what commonly measured on LTS JJs, with a saturation of the measured standard deviation σ below 50 mK [22], which corresponds to the crossover temperature T cr from the thermal to the MQT regime.…”

Section: About My Story With the Josephson Effectmentioning

confidence: 99%

Introduction: the Josephson Effect and Its Role in Physics

Tafuri

2021

J Supercond Nov Magn

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It has been a real honor for me to organize this special issue which celebrates Prof. Brian Josephson's 80th birthday and his wonderful discovery [1, 2]. I am grateful to Sara Kate Heikerott, Senior Editor, and to Vladimir Kresin, Editor of the Journal of Superconductivity and Novel Magnetism, for the invitation. I am also grateful to all the authors for their contributions, and, especially, to John Clarke, who was playing an important role in the beginning of the project with his help with the content of the issue. It has been a real privilege for me to be in contact with such great and inspiring colleagues and friends. This issue obviously builds on the already available impressive literature including some dedicated volumes [3-8] and tries to give a flavor of the amazing impact of the Josephson effect in so many different fields of fundamental research and applications. I have been asked to give a short overview in view of a possible unitary vision over the various contributions. I would start from the contributions of John Clarke and John Rowell respectively. Apart from the scientific message, they are amazing historical documents. John Clarke in his "Brian Josephson and the Royal Society Mond Laboratory" brings us back to the autumn of 1964 in the Royal Society Mond Laboratory in Cambridge. We are at the Mond seminar of Brian Josephson, who is explaining his theory of pair tunneling in 1962 and its experimental demonstration by Anderson and Rowell during the following year, and finally observation of quantum interference by Jaklevic et al.-the introduction of the dc SQUID (Superconducting QUantum Interference Device). John's conclusions are a wonderful message not only for Brian Josephson but for every student looking for a project: "Looking back, it all started 56 years ago when I heard Brian Josephson's seminar and Brian Pippard's suggestion of the voltmeter the very next day. Brian, I offer my very best wishes and congratulations on

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Section: About My Story With the Josephson Effectmentioning

confidence: 99%

Introduction: the Josephson Effect and Its Role in Physics

Tafuri

2021

J Supercond Nov Magn

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Critical Current Suppression in Spin-Filter Josephson Junctions

Ahmad

Palma

Caruso

et al. 2020

J Supercond Nov Magn

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A feasible path for the use of ferromagnetic josephson junctions in quantum circuits: The ferro-transmon

Massarotti¹,

Ahmad

Satariano

et al. 2023

Low Temperature Physics

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We discuss the capabilities of ferromagnetic (F) Josephson junctions (JJs) in a variety of layouts and configurations. The main goal is to demonstrate the potential of these hybrid JJs to disclose new physics and the possibility to integrate them in superconducting classical and quantum electronics for various applications. The feasible path towards the use of ferromagnetic Josephson junctions in quantum circuits starts from experiments demonstrating macroscopic quantum tunneling in NbN/GdN/NbN junctions with ferro-insulator barriers and with triplet components of the supercurrent, supported by a self-consistent electrodynamic characterization as a function of the barrier thickness. This has inspired further studies on tunnel ferromagnetic junctions with a different layout and promoted the first generation of ferromagnetic Al-based JJs, specifically Al/AlOx/Al/Py/Al. This layout takes advantage of the capability to integrate the ferromagnetic layer in the junction without affecting the quality of the superconducting electrodes and of the tunnel barrier. The high quality of the devices paves the way for the possible implementation of Al tunnel-ferromagnetic JJs in superconducting quantum circuits. These achievements have promoted the notion of a novel type of qubit incorporating ferromagnetic JJs. This qubit is based on a transmon design featuring a tunnel JJ in parallel with a ferromagnetic JJ inside a SQUID loop capacitively coupled to a superconducting readout resonator. The effect of an external RF field on the magnetic switching processes of ferromagnetic JJs has been also investigated.

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Phase Dynamics and Macroscopic Quantum Tunneling

Cited by 4 publications

References 150 publications

Introduction: the Josephson Effect and Its Role in Physics

Introduction: the Josephson Effect and Its Role in Physics

Critical Current Suppression in Spin-Filter Josephson Junctions

A feasible path for the use of ferromagnetic josephson junctions in quantum circuits: The ferro-transmon

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