Compressed quantum computation using a remote five-qubit quantum computer

M. Hebenstreit, D. Alsina, J. I. Latorre, and B. Kraus
Phys. Rev. A 95, 052339 – Published 19 May 2017

Abstract

The notion of compressed quantum computation is employed to simulate the Ising interaction of a one-dimensional chain consisting of n qubits using the universal IBM cloud quantum computer running on log2(n) qubits. The external field parameter that controls the quantum phase transition of this model translates into particular settings of the quantum gates that generate the circuit. We measure the magnetization, which displays the quantum phase transition, on a two-qubit system, which simulates a four-qubit Ising chain, and show its agreement with the theoretical prediction within a certain error. We also discuss the relevant point of how to assess errors when using a cloud quantum computer with a limited amount of runs. As a solution, we propose to use validating circuits, that is, to run independent controlled quantum circuits of similar complexity to the circuit of interest.

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  • Received 18 January 2017

DOI:https://doi.org/10.1103/PhysRevA.95.052339

©2017 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

M. Hebenstreit1, D. Alsina2,3, J. I. Latorre2,3, and B. Kraus1

  • 1Institute for Theoretical Physics, University of Innsbruck, Innsbruck, Austria
  • 2Dept. Física Quàntica i Astrofísica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
  • 3Institut de Ciències del Cosmos, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain

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Issue

Vol. 95, Iss. 5 — May 2017

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