Workshop »Interplay of quantum information, foundations and gravity« Mitschnitt einer Veranstaltung des Institute for Quantum Optics and Quantum Information (IQOQI) am Montag, dem 28. Mai 2018 im Theatersaal der Österreichischen Akademie der Wissenschaften Teil 2: Marcus Huber: Thermodynamic limitations to quantum measurements and clocks Kamera: Zizhu Wang Schnitt: Daniel Winkler Marcus Huber arbeitet am IQOQI Wien. Abstract: While quantum mechanics assumes a continuous parameter t driving the reversible time evolution of quantum systems, it is not a direct observable. We can only indirectly infer this parameter through operational definitions, such as operational time being defined through what a clock measures. But, in a universe with a non-zero temperature background, idealised quantum measurements are just as impossible as ideal quantum clocks. Indeed, the only operational way to measure time, or any quantum system, is through harnessing out-of-equilibrium resources, i.e. spending thermodynamic work to implement that measurement. In this talk we show how the work cost of quantum measurements and quantum clocks diverges as the quality of the measurement increases. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Thermodynamic equilibrium 00:00:08 3. Time and clocks 00:08:12 4. Optimizing efficiency, accuracy and resolution 00:18:55 5. The smallest possible clock 00:24:05 6. Quantum measurements 00:30:08 7. Questions from the audience 00:45:55

Quantenphysik, Thermodynamik, Messung

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