Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Study on superradiance in semiconductor high-quality thin films and nanoparticles

Phuong Le Quang

Published Mar 25, 2013• 0 citations
OpenAlex

Abstract

this is the author’s version of a work that was accepted for publication in Journal of Crystal Growth. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Crystal Growth, 378, (2013), doi:10.1016/j.jcrysgro.2012.12.103

Related papers

Nuclear Superradiance in Solids

J. H. Terhune, George C. Baldwin

Received 16 February 1965DOI:https://doi.org/10.1103/PhysRevLett.14.589©1965 American Physical Society

Physical Review Letters•Apr 12, 1965•24 citations

Symmetric Folding Principle for Quantum Propagator Synthesis

Vishesh Kaushik

Author-prepared preprint, Version 1. This manuscript presents a symmetry-based framework for quantum propagator synthesis, called the Symmetric Folding Principle. The framework uses folding symmetries to reformulate certain unitary propagator-synthesis problems as structured state/fiber steering problems, followed by a prescribed folded continuation of the control sequence. This version may differ from later submitted, accepted, or published versions of the manuscript. Copyright © 2026 Vishesh Kaushik. The author retains copyright in this preprint. Rights in any future peer-reviewed published version will be determined by the corresponding publishing agreement with the relevant journal or publisher.

•Jun 1, 2026•0 citations

Optical superradiance in crystals — method of relaxation process studies.

Journal of Molecular Structure•May 1, 1990•0 citations

The effect of niobium thin film structure on losses in superconducting circuits

Maxwell Drimmer, Sjoerd Telkamp, Felix L Fischer +7 more

Abstract The performance of superconducting microwave circuits is strongly influenced by the material properties of the superconducting film and substrate. While progress has been made in understanding the importance of surface preparation and the effect of surface oxides, the complex effect of superconductor film structure on microwave losses is not yet fully understood. In this study, we investigate the microwave properties of niobium resonators with different crystalline properties and related surface topographies. We analyze a series of magnetron sputtered films in which the Nb crystal orientation and surface topography are changed by varying the substrate temperatures between room temperature and 975 K. The lowest-loss resonators that we measure have quality factors of over 10 6 at single-photon powers, among the best ever recorded using the Nb on sapphire platform. We observe the highest quality factors in films grown at an intermediate temperature regime of the growth series (550 K) where the films display both preferential ordering of the crystal domains and low surface roughness. Furthermore, we analyze the temperature-dependent behavior of our resonators to learn about how the quasiparticle density in the Nb film is affected by the niobium crystal structure and the presence of grain boundaries. Our results stress the connection between the crystal structure of superconducting films and the loss mechanisms suffered by the resonators and indicate that even a moderate change in temperature during thin film deposition can significantly affect the resulting quality factors.

Materials for Quantum Technology•Oct 14, 2025•4 citations

Superradiance in molecular semiconductors

Michele Cerminara, Francesco Meinardi, RICCARDO TUBINO

•Jan 1, 2007•0 citations

Bounded research for quentum mechanics

S.K.VANITHA null, R.REVATHI null

IJET International Journal of Engineering and Techniques call for research papers international engineering science journal.IJET publishes is a peer reviewed,open access international scientific journal.IJET is rapid publication of high quality original research articles as well as review articles in engineering.IJET indexed Mendeley (developed by elsevier , scopus), worldCat, sjifactor, indexcopernicus, citefactor, google scholar, researchbib.

International Journal of Engineering and Techniques•Jun 21, 2020•0 citations
this is the author’s version of a work that was accepted for publication in Journal of Crystal Growth. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Crystal Growth, 378, (2013), doi:10.1016/j.jcrysgro.2012.12.103
Author-prepared preprint, Version 1. This manuscript presents a symmetry-based framework for quantum propagator synthesis, called the Symmetric Folding Principle. The framework uses folding symmetries to reformulate certain unitary propagator-synthesis problems as structured state/fiber steering problems, followed by a prescribed folded continuation of the control sequence. This version may differ from later submitted, accepted, or published versions of the manuscript. Copyright © 2026 Vishesh Kaushik. The author retains copyright in this preprint. Rights in any future peer-reviewed published version will be determined by the corresponding publishing agreement with the relevant journal or publisher.
Abstract The performance of superconducting microwave circuits is strongly influenced by the material properties of the superconducting film and substrate. While progress has been made in understanding the importance of surface preparation and the effect of surface oxides, the complex effect of superconductor film structure on microwave losses is not yet fully understood. In this study, we investigate the microwave properties of niobium resonators with different crystalline properties and related surface topographies. We analyze a series of magnetron sputtered films in which the Nb crystal orientation and surface topography are changed by varying the substrate temperatures between room temperature and 975 K. The lowest-loss resonators that we measure have quality factors of over 10 6 at single-photon powers, among the best ever recorded using the Nb on sapphire platform. We observe the highest quality factors in films grown at an intermediate temperature regime of the growth series (550 K) where the films display both preferential ordering of the crystal domains and low surface roughness. Furthermore, we analyze the temperature-dependent behavior of our resonators to learn about how the quasiparticle density in the Nb film is affected by the niobium crystal structure and the presence of grain boundaries. Our results stress the connection between the crystal structure of superconducting films and the loss mechanisms suffered by the resonators and indicate that even a moderate change in temperature during thin film deposition can significantly affect the resulting quality factors.