Superconducting analogues of quantum mechanical optical phenomena: macroscopic quantum superpositions and squeezing in a SQUID ring

Everitt, M J, Clark, T D, Stiffell, P B, Vourdas, A, Ralph, J F, Prance, R J and Prance, H (2004) Superconducting analogues of quantum mechanical optical phenomena: macroscopic quantum superpositions and squeezing in a SQUID ring. Physical Review A, 69 (4). 043804/1-043804/8. ISSN 1050-2947

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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.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Depositing User: Peter Stiffell
Date Deposited: 06 Feb 2012 19:53
Last Modified: 08 Mar 2017 08:49
URI: http://sro.sussex.ac.uk/id/eprint/22832

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