Volume 89, Number 3, February 2010
|Number of page(s)||5|
|Published online||22 February 2010|
The size of macroscopic superposition states in flux qubits
Department of Physics and Berkeley Quantum Information and Computation Center, University of California - Berkeley, CA 94720, USA
2 Department of Chemistry and Berkeley Quantum Information and Computation Center, University of California - Berkeley, CA 94720, USA
3 Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo 200 University Avenue West, Waterloo, ON, Canada, N2L 3G1
Corresponding author: firstname.lastname@example.org
Accepted: 21 January 2010
The question as to whether or not quantum mechanics is applicable to the macroscopic scale has motivated efforts to generate superposition states of macroscopic numbers of particles and to determine their effective size. Superpositions of circulating current states in flux qubits constitute candidate states that have been argued to be at least mesoscopic. We present a microscopic analysis that reveals the number of electrons participating in these superpositions to be surprisingly but not trivially small, even though differences in macroscopic observables are large.
PACS: 03.65.Ta – Foundations of quantum mechanics; measurement theory / 74.50.+r – Tunneling phenomena; Josephson effects / 74.90.+n – Other topics in superconductivity
© EPLA, 2010
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