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Dynamic generation of topologically protected self-correcting quantum memory

Becker, Daniel and Tanamoto, Tetsufumi and Hutter, Adrian and Pedrocchi, Fabio L. and Loss, Daniel. (2013) Dynamic generation of topologically protected self-correcting quantum memory. Physical review A, General physics, Vol. 87, H. 4 , 042340.

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Official URL: http://edoc.unibas.ch/dok/A6223227

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Abstract

We propose a scheme to dynamically realize a quantum memory based on the toric code. The code is generated from qubit systems with typical two-body interactions (Ising, XY, Heisenberg) using periodic, NMR-like, pulse sequences. It allows one to encode the logical qubits without measurements and to protect them dynamically against the time evolution of the physical qubits. A weakly coupled cavity mode mediates a long-range attractive interaction between the stabilizer operators of the toric code, thereby suppressing the creation of thermal anyons. This significantly increases the lifetime of the memory compared to the code with noninteracting stabilizers. We investigate how the fidelity, with which the toric code is realized, depends on the period length T of the pulse sequence and the magnitude of possible pulse errors. We derive an optimal period T-opt that maximizes the fidelity.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Becker, Daniel and Hutter, Adrian and Pedrocchi, Fabio Luigi and Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:American Institute of Physics
ISSN:1050-2947
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Apr 2015 09:12
Deposited On:27 Feb 2014 15:46

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