Conference »Quantum Physics of Nature« (QUPON 2005) Mitschnitt einer Veranstaltung der Fakultät für Physik der Universität Wien am Sonntag, dem 22. Mai 2005 im Großen Festsaal der Universität Wien Teil 13: David Mermin: In Praise of Measurement Abstract: A quantum computer provides a toy universe in which to reexamine many aspects of quantum mechanics and quantum metaphysics. In particular measurement, against which John Bell unleashed one of his most elegant polemics, plays a transparent role. Since all measurements can be constructed out of identical 1-Qbit measurement gates, such obscurity as there is in the notion of measurement reduces to the obscurity, if any, of the elementary 1-Qbit gate. The 1-Qbit measurement gate is insufficiently celebrated. Without it the quantum computer has, in Abner Shimony's admirable words, “no foreign policy.” Without it no computation has been done. Without it no computation can begin. Without it there can be no error correction. Measurement takes coherence away but measurement also gives coherence. Praised be measurement. David Mermin ist Professor für Physik an der Cornell University in Ithaca (NY). INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Introduction 00:00:09 3. Quantum computation 00:04:20 4. Full definition of 1-qubit measurement gate 00:11:08 5. Meaning of state of a qubit 00:17:37 6. Role of measurement in error correction 00:22:24 7. Questions from the audience 00:29:12

Quantenphysik, Quantencomputer, Messung

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