Definitive hallmark of superconductivity, Meissner effect, has been confirmed inside 2D quantum van der Waals superconductors

https://www.eurekalert.org/news-releases/1133816

"2D materials' small volume/ weak magnetic signals forces using electrical 0-resistance measurement to infer superconductivity rather than proving its magnetic hallmarks... overcome using ultra-sensitive dynamic cantilever magnetometry detecting minute magnetic moment changes down to hundred-thousandth of billionth of Ampere-meter squared... exhibits type-II superconductivity using layered tungsten disulfide as a model... topological quantum hardware resistance-free quantum circuits"