Special Issue "Quantum Information: Fragility and the Challenges of Fault Tolerance"

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Quantum Information".

Deadline for manuscript submissions: closed (31 October 2019).

Special Issue Editors

Prof. Dr. Göran Wendin
E-Mail Website
Guest Editor
Department of Microtechnology and Nanoscience-MC2, Chalmers University of Technology, S-412 96 Göteborg, Sweden
Interests: superconducting qubits; quantum computing; quantum simulation; quantum neural networks; biological networks; quantum effects in biology
Dr. Giulia Ferrini
E-Mail Website
Guest Editor
Department of Microtechnology and Nanoscience-MC2, Chalmers University of Technology, S-412 96 Göteborg, Sweden
Interests: quantum computing; quantum optics; continuous variables; quantum advantage; quantum supremacy

Special Issue Information

Dear Colleagues,

The recent advances in scaling up quantum processors into the range of 50–100 qubits make quantum error correction (QEC) and fault tolerance urgent practical issues in order to achieve quantum advantage or even quantum supremacy. Interesting developments in regular QEC include new classes of codes, either in the qubit setting (topological, non-abelian, holographic…) or with continuous variables, such as Gottesman-Kitaev-Preskill  (GKP) or cat-codes. However, universal fault-tolerant quantum computation based on QEC is not yet within reach. The near-term challenge is rather to make optimal use of available hardware and software resources. This requires developing useful characterization tools, typically involving the number, connectivity, and coherence of physical qubits, the available gate set, and the number of operations that can be run in parallel. On the software side, machine learning (ML) may be used for optimizing gate sequences, minimizing circuit depths, optimizing variational schemes. Other challenges involve new types of architectures, like dynamical complex systems based on (brain-inspired) adaptive quantum networks.

Prof. Dr. Göran Wendin
Dr. Giulia Ferrini
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Entropy is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • fault-tolerance
  • quantum computation
  • quantum simulation
  • quantum error correction
  • quantum advantage
  • quantum supremacy
  • machine learning
  • quantum networks

Published Papers (1 paper)

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Research

Open AccessArticle
Robust Diabatic Grover Search by Landau–Zener–Stückelberg Oscillations
Entropy 2019, 21(10), 937; https://doi.org/10.3390/e21100937 - 25 Sep 2019
Abstract
Quantum computation by the adiabatic theorem requires a slowly-varying Hamiltonian with respect to the spectral gap. We show that the Landau–Zener–Stückelberg oscillation phenomenon, which naturally occurs in quantum two-level systems under non-adiabatic periodic drive, can be exploited to find the ground state of [...] Read more.
Quantum computation by the adiabatic theorem requires a slowly-varying Hamiltonian with respect to the spectral gap. We show that the Landau–Zener–Stückelberg oscillation phenomenon, which naturally occurs in quantum two-level systems under non-adiabatic periodic drive, can be exploited to find the ground state of an N-dimensional Grover Hamiltonian. The total runtime of this method is O ( 2 n ) , which is equal to the computational time of the Grover algorithm in the quantum circuit model. An additional periodic drive can suppress a large subset of Hamiltonian control errors by using coherent destruction of tunneling, thus outperforming previous algorithms. Full article
(This article belongs to the Special Issue Quantum Information: Fragility and the Challenges of Fault Tolerance)
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