Tuned transition from quantum to classical for macroscopic quantum states

Details Tuned transition from quantum to classical for macroscopic quantum states Tuned transition from quantum to classical for macroscopic quantum states

2010-12-09

arxiv.org/abs/1012.2053v2

Phys.Rev.Lett.106:170404,2011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.106.170404

The boundary between the classical and quantum worlds has been intensely studied. It remains fascinating to explore how far the quantum concept can reach with use of specially fabricated elements. Here we employ a tunable flux qubit with basis states having persistent currents of 1$ \mu$A carried by a billion electrons. By tuning the tunnel barrier between these states we see a cross-over from quantum to classical. Released from non-equilibrium, the system exhibits spontaneous coherent oscillations. For high barriers the lifetime of the states increases dramatically while the tunneling period approaches the phase coherence time and the classical regime is reached.

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