Special Issue "Nanofabrication of Superconducting Circuits"
Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 7566
Interests: nanofabrication of superconducting circuits; oxide heterostructures; novel Josephson junctions; superconducting quantum interferometers (SQUIDs)
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Superconducting circuits exhibit unique characteristics that are not attainable by conventional semiconductor electronics: quantum limited low noise detection and amplification, dispersion- and losses-free interconnections, as well as the energy efficient ultra-high frequency operation of analog and digital circuits, and the realization of a scalable quantum computer. The miniaturization of superconducting circuits follows the trend towards the miniaturization of semiconductor electronics, but with significant delay and a specificity related to the spatial variations in the macroscopic wave function of phase-correlated Cooper pairs in superconductors. In contrast to semiconductors and normal metals, for example, a nanometer-sized constriction transforms superconductors into a Josephson junction, which serves as an active component of superconductor electronics. Today's superconducting components must be manufactured on scales comparable to, or even smaller than, the superconducting coherence length and London penetration depth, which creates difficulties in the manufacturing, operation, and theoretical interpretation of the properties of the devices.
The need to develop specific methods for nanofabrication, to minimize or exploit the kinetic inductance of ultra-thin superconducting structures, and the need to squeeze a quantum of magnetic flux into nanoscale superconducting cells with Josephson junctions are some of the main obstacles to the miniaturization of superconducting circuits. They should be addressed in a comprehensive manner for specific applications.
The most popular superconducting materials that are used in superconducting electronics are Nb, Al, NbN, NbTiN, TiN, MoRe and YBa2Cu3O7-x. Electron beam lithography, direct writing by laser, focused ion beam milling, and self-aligned nanofabrication are the most frequently used methods for the creation of nanoscale superconducting devices. Superconducting bolometers, single photon detectors, SIS detectors, Josephson junctions, SQUIDs, RSFQ circuits, qubits and their readouts are just some of the established applications of the superconducting circuits that require fabrication with nanometer resolutions.
The objective of this Special Issue is to present studies in the field of nanoscale superconducting devices, with emphasis on their nanofabrication, testing and theoretical modelling. Therefore, researchers are invited to submit their manuscripts to this Special Issue and contribute their theoretical models, technology development, reviews, and studies.
Prof. Dr. Michael I. Faley
Manuscript Submission Information
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- Josephson junctions
- superconducting single photon detectors
- SIS detectors, superconducting bolometers