CoQuS II Kick-Off Workshop, also honouring Reinhold Bertlmann's 65th Birthday Mitschnitt einer Veranstaltung von Universität Wien, Technischer Universität Wien und Fonds zur Förderung der wissenschaftlichen Forschung am Donnerstag, dem 30. September 2010 im Christian-Doppler-Hörsaal der Fakultät für Physik der Universität Wien Teil 7. Stefan Filipp (ETH Zürich): Ultra-Cold Neutrons, Berry's Geometric Phase and Superconducting Quantum Circuits The adiabatic transport of a quantum system around a closed path in parameter space leads to a geometric contribution to the acquired phase, Berry's phase. This phase depends only on the path, but not on dynamical quantities such as energy and evolution time. It is therefore considered to be robust against certain types of fluctuations. Using trapped ultra-cold neutrons exposed to time-varying, adiabatically fluctuating magnetic fields, it is experimentally demonstrated that the geometric component of dephasing vanishes for long evolution cycles. Furthermore, we have measured Berry's geometric phase with superconducting quantum circuits. These multi-level artificial atoms provide a versatile platform for investigations of geometric phases of single and multi-particle systems. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Introductory remarks 00:00:25 3. Berry's geometric phase and noise 00:04:39 4. Ultra cold neutrons for Berry phase measurement 00:10:00 5. Superconducting Qubits - Circuit QED 00:18:17 6. Berry phase in circuit QED 00:29:16

Geometrische Phase, Qubit, Supraleitung

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