2011/07/15 by Dmitry Mozyrsky, Mozyrsky, Dmitry, Dmitry Solenov +1
Physics and Astronomy · #FOS: Physical sciences #Magnetic properties of thin films #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics of Superconductivity and Magnetism #Quantum Gases (cond-mat.quant-gas) #Quantum and electron transport phenomena #Superconductivity (cond-mat.supr-con) #cond-mat.mes-hall #cond-mat.quant-gas #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1107.3124
4 pages
arxiv created 2011/07/15 · openalex publication_date 2011/07/15 · arxiv updated 2011/07/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study quantum fluctuations of persistent current in a small superconducting ring. Based on a microscopic model of the ring we argue that under certain conditions such ring will exhibit coherent quantum phase slips, similar to those in a flux qubit. We evaluate the frequency of such coherent oscillations and find that it is strongly dependent on wire's diameter primarily due to the large momentum released by the condensate as a result of a phase slip event. We also find that the value of such frequency is not a self-averaging quantity, that is, it depends on a particular realization of the static impurity potential.