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Title: Superconducting analogs of quantum optical phenomena: macroscopic quantum superpositions and squeezing in a superconducting quantum-interference device ring
Authors: Everitt, Mark J.
Clark, T.D.
Stiffell, P.B.
Vourdas, A.
Ralph, J.F.
Prance, R.J.
Prance, H.
Issue Date: 2004
Publisher: © American Physical Society
Citation: EVERITT, M.J. ... et al., 2004. Superconducting analogs of quantum optical phenomena: macroscopic quantum superpositions and squeezing in a superconducting quantum-interference device ring. Physical Review A, 69 (4), 8 pp.
Abstract: In this paper we explore the quantum behavior of a superconducting quantum-interference device (SQUID) ring which has a significant Josephson coupling energy. We show that the eigenfunctions of the Hamiltonian for the ring can be used to create macroscopic quantum superposition states of the ring. We also show that the ring potential may be utilized to squeeze coherent states. With the SQUID ring as a strong contender as a device for manipulating quantum information, such properties may be of great utility in the future. However, as with all candidate systems for quantum technologies, decoherence is a fundamental problem. In this paper we apply an open systems approach to model the effect of coupling a quantum-mechanical SQUID ring to a thermal bath. We use this model to demonstrate the manner in which decoherence affects the quantum states of the ring.
Description: This article was published in the journal, Physical Review A [© American Physical Society] and the definitive version is available at: http://dx.doi.org/10.1103/PhysRevA.69.043804
Version: Published
DOI: 10.1103/PhysRevA.69.043804
URI: https://dspace.lboro.ac.uk/2134/12069
Publisher Link: http://dx.doi.org/10.1103/PhysRevA.69.043804
ISSN: 1050-2947
Appears in Collections:Published Articles (Physics)

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