Detection of geometric phases in superconducting nanocircuits

Giuseppe Falci (), Rosario Fazio, G. Massimo Palma, Jens Siewert and Vlatko Vedral
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Giuseppe Falci: Università di Catania
Rosario Fazio: Università di Catania
G. Massimo Palma: Università di Palermo
Jens Siewert: Università di Catania
Vlatko Vedral: Centre for Quantum Computation, Clarendon Laboratory, University of Oxford

Nature, 2000, vol. 407, issue 6802, 355-358

Abstract: Abstract When a quantum-mechanical system undergoes an adiabatic cyclic evolution, it acquires a geometrical phase factor1 in addition to the dynamical one; this effect has been demonstrated in a variety of microscopic systems2. Advances in nanotechnology should enable the laws of quantum dynamics to be tested at the macroscopic level3, by providing controllable artificial two-level systems (for example, in quantum dots4 and superconducting devices5,6). Here we propose an experimental method to detect geometric phases in a superconducting device. The setup is a Josephson junction nanocircuit consisting of a superconducting electron box. We discuss how interferometry based on geometrical phases may be realized, and show how the effect may be applied to the design of gates for quantum computation.

Date: 2000
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DOI: 10.1038/35030052

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