Investigations on a new device application of the a. c. Josephson effect

An-Chun Ji, Qing Sun, X. C. Xie +1 more

We describe an optical system that allows for direct observation of the photonic Josephson effects in two weakly linked microcavities containing ultracold two-level atoms. We show that, by moving the ultracold atoms within one cavity, we could simulate an analogous superconducting circuit and realize both the alternating- and direct-current (ac and dc) photonic Josephson effects. This provides a strategy for constructing novel interference devices of coherent photons and enables new investigations of the effect of many-body physics in strongly coupled atom-cavity systems.

Fumi Irie, Ai Nakamura

Stefan Benacka, L. Ondris

R. Citro, Claudio Guarcello, S. Pagano

In the realm of physics, a pivotal moment occurred six decades ago when Brian Josephson made a groundbreaking prediction, setting in motion a series of events that would eventually earn him the prestigious Nobel Prize eleven years later. This prediction centered around what is now known as the Josephson effect, a phenomenon with far-reaching implications. At the heart of this effect lies the Josephson junction (JJ), a device that has become a linchpin in various scientific applications. This chapter delves into the foundational principles of the Josephson effect and the remarkable properties of JJs. From their role in metrology to their application in radiation detectors, these junctions have ushered in a new era of electronics. Exploiting the unique features of superconductive devices, such as high speed, low dissipation, and dispersion, JJs find today practical implementation in the development of superconductive qubits and nanotechnology applications.

C. Guarcello, R. Citro, O. Durante +6 more

This paper investigates the behavior of an rf-superconducting quantum interference device formed by embedding two anomalous Josephson junctions in a superconducting ring with a non-negligible inductance. The authors show that an in-plane magnetic field can be used to induce and control the hysteretical response of the device. In this way, the proposed system can be effectively used to detect and measure the anomalous Josephson effect.

J. Ottes