Quantum Clocks in Nature Communications

Last updated June 1, 2020 by Andrew Brown

A new paper on Quantum Clocks has been published in the prestigious Nature Communications.
A team of physicists led by Professor Caslav Brukner from the University of Vienna and the Institute for Quantum Optics and Quantum Information (IQOQI) Vienna explored the temporal localisability of events when quantum systems influence space-time according to Einstein’s general relativity. Dr Alessio Belenchia, from Queen’s University Belfast, is among the authors of this new work.
The study develops a framework to define events and their localisation with respect to a quantum clock reference frame, also in the presence of gravitating quantum systems. The major results are that the time localisability of events becomes relative, depending on the reference frame, and that for each event there exists always a (quantum) clock according to which that event occurs at a sharp, precise time. This is useful because, using this clock as a reference, the time evolution of quantum systems can be described as it is in ordinary situations where all events are localised in time.


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