In this note we obtain commutativity criteria for normal compact operators using the projective spectrum. We thus improve a corresponding result obtained by Chagouel, Stessin and Zhu in Trans. Amer.

Jonathan Weisberg, Commutativity or Holism? A Dilemma for Conditionalizers, The British Journal for the Philosophy of Science, Vol. 60, No. 4 (Dec., 2009), pp. 793-812 ...

Researchers explored the connection between the quantum speed limit (QSL) and time resolution in quantum sensing, particularly through Ramsey interferometry. They established that the best ...