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Proceedings Paper

Control of a superconducting qubit in the presence of a nonlinear backreaction
Author(s): Jason F. Ralph; Terrence D. Clark; Mark J. Everitt; Peter Steiffell; Robert J. Prance; Helen Prance
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Paper Abstract

There are a number of systems that are currently being considered as candidates for the construction of qubits, quantum logic gates and quantum computers. Some of the systems, notably atoms in magnetic traps and nuclear magnetic resonance (NMR) systems, have had some success in performing the elementary operations that would be required in large-scale quantum computer. However, these systems are not necessarily seen as viable technologies for quantum computing in the longer term. The recent demonstration of macroscopic coherence in a superconducting ring (consisting of a thick superconducting ring containing one or more Josephson weak link devices) has added significant weight to the idea of using superconducting persistent current devices (SQUIDs) in quantum logic systems. In this paper, we consider one aspect of the quantum mechanical SQUID, the nonlinear effect of SQUID on the classical control parameters, and we discuss how it may influence the construction and design of quantum logic gates based on SQUID devices. In particular, we look at problems associated with fixing the classical magnetic flux bias for a quantum mechanical SQUID at, or near, a quantum mechanical transition or resonance.

Paper Details

Date Published: 1 August 2002
PDF: 8 pages
Proc. SPIE 4732, Photonic and Quantum Technologies for Aerospace Applications IV, (1 August 2002); doi: 10.1117/12.477421
Show Author Affiliations
Jason F. Ralph, Univ. of Liverpool (United Kingdom)
Terrence D. Clark, Univ. of Sussex (United Kingdom)
Mark J. Everitt, Univ. of Sussex (United Kingdom)
Peter Steiffell, Univ. of Sussex (United Kingdom)
Robert J. Prance, Univ. of Sussex (United Kingdom)
Helen Prance, Univ. of Sussex (United Kingdom)

Published in SPIE Proceedings Vol. 4732:
Photonic and Quantum Technologies for Aerospace Applications IV
Eric Donkor; Andrew R. Pirich; Eric Donkor; Michael J. Hayduk; Andrew R. Pirich; Edward W. Taylor, Editor(s)

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