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Physik: Mit acht Dimensionen zu Quantenkryptografie-Rekord

Physik: Mit acht Dimensionen zu Quantenkryptografie-Rekord
science.orf.at - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from science.orf.at Daily Mail and Mail on Sunday newspapers.

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Quanta Magazine

Quanta Magazine
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Physiker entwickeln einen Quantenkühlschrank - Bauanleitung zeigt Weg zu neuen Tieftemperatur-Rekorden für Quantensysteme

28. Juli 2021
Physiker haben die Bauanleitung für einen auf Lasern und einer ultrakalten Atomwolke basierenden Quantenkühlschrank entwickelt. © TU Wien
Kältemaschine im Quantenmaßstab: Physiker haben ein Konzept entwickelt, durch das Atomwolken und andere Quantensysteme weiter heruntergekühlt werden könnten. Möglich wird dies durch die Kombination eines ultrakalten Bose-Einstein-Kondensats mit Prinzipien der klassischen Thermodynamik, wie sie beispielsweise in einem Kühlschrank greifen. Noch gibt es für den Quantenkühlschrank zwar nur die Bauanleitung, deren Umsetzung könnte aber bahnbrechende Anwendungen ermöglichen.
Wenn es um das Herunterkühlen von Atomwolken, Quantenbits oder anderen Teilchen für quantenphysikalische Anwendungen geht, ist bisher meist eine Laserkühlung im Spiel. Ihre Lichtstrahlen bremsen die Eigenbewegung der Teilchen so weit aus, dass diese fast stillstehen. Dadurch können Systems bis knapp über dem absoluten Nullpunkt herunterg ....

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Wie Zeitreisen möglich sind

Wie Zeitreisen möglich sind
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Measuring time accurately increases the entropy in the universe

Bruce Rolff/Alamy
Keeping time accurately comes with a price. The maximum accuracy of a clock is directly related to how much disorder, or entropy, it creates every time it ticks.
Natalia Ares at the University of Oxford and her colleagues made this discovery using a tiny clock with accuracy that can be controlled. The clock consisted of a 50-nanometre thick membrane of silicon nitride, vibrated by an electric current. Each time the membrane moved up and down once and then returned to its original position, the researchers counted a tick, and the regularity of the spacing between the ticks represented the accuracy of the clock. ....

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