Publication

Critical Josephson current in the dynamical Coulomb blockade regime

Klaus Kern, Markus Etzkorn, Matthias Alexander Eltschka, Maximilian Assig
2016
Journal Articles

Abstract

The current-voltage characteristics of a voltage-biased Josephson junction in the low conductance regime of an ultra-low temperature scanning tunneling microscope (STM) is dominated by sequential charge tunneling. Using P(E) theory we show that the Josephson coupling energy, experimentally determined in this regime, is in good agreement with the critical current I-0 calculated from the Ambegaokar-Baratoff formula. In this way, we can determine the critical current values of a Josephson junction in an STM. Furthermore, we experimentally determine a range of validity for P(E) theory, which is in accordance with theoretical predictions. In this way, we establish an optimal parameter range, in which Josephson STM can be performed.

Official source

https://infoscience.epfl.ch/entities/publication/8850a49b-843a-45d5-aeee-197d24c7cfa6

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Klaus Kern, Markus Etzkorn, Matthias Alexander Eltschka, Maximilian Assig
2016
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/8850a49b-843a-45d5-aeee-197d24c7cfa6

About this result

Related concepts (15)

Josephson effect

In physics, the Josephson effect is a phenomenon that occurs when two superconductors are placed in proximity, with some barrier or restriction between them. It is an example of a macroscopic quantum phenomenon, where the effects of quantum mechanics are observable at ordinary, rather than atomic, scale. The Josephson effect has many practical applications because it exhibits a precise relationship between different physical measures, such as voltage and frequency, facilitating highly accurate measurements.

Phase qubit

In quantum computing, and more specifically in superconducting quantum computing, the phase qubit is a superconducting device based on the superconductor–insulator–superconductor (SIS) Josephson junction, designed to operate as a quantum bit, or qubit. The phase qubit is closely related, yet distinct from, the flux qubit and the charge qubit, which are also quantum bits implemented by superconducting devices.

Flux qubit

In quantum computing, more specifically in superconducting quantum computing, flux qubits (also known as persistent current qubits) are micrometer sized loops of superconducting metal that is interrupted by a number of Josephson junctions. These devices function as quantum bits. The flux qubit was first proposed by Terry P. Orlando et al. at MIT in 1999 and fabricated shortly thereafter. During fabrication, the Josephson junction parameters are engineered so that a persistent current will flow continuously when an external magnetic flux is applied.

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