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Protection of Quantum Information in a Chain of Josephson Junctions

Brookes, P; Chang, T; Szymanska, M; Grosfeld, E; Ginossar, E; Stern, M; (2022) Protection of Quantum Information in a Chain of Josephson Junctions. Physical Review Applied , 17 (2) , Article 024057. 10.1103/PhysRevApplied.17.024057. Green open access

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Abstract

Symmetry considerations are key to our understanding of the fundamental laws of nature. The presence of a symmetry implies that a physical system is invariant under specific transformations, and this invariance may have deep consequences. For instance, symmetry arguments state that a system will remain in its initial state if incentives to actions are equally balanced. Here, we apply this principle to a chain of qubits and show that it is possible to engineer the symmetries of its Hamiltonian in order to keep quantum information intrinsically protected from both relaxation and decoherence. We show that the coherence properties of this system are strongly enhanced relative to those of its individual components. Such a qubit chain can be realized using a simple architecture consisting of a relatively small number of superconducting Josephson junctions.

Type: Article
Title: Protection of Quantum Information in a Chain of Josephson Junctions
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevApplied.17.024057
Publisher version: https://doi.org/10.1103/PhysRevApplied.17.024057
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10145724
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