Cross-Verification of Independent Quantum Devices

Author(s)
C. Greganti, T. F. Demarie, M. Ringbauer, J. A. Jones, Valeria Saggio, I. Alonso Calafell, L. A. Rozema, A. Erhard, M. Meth, L. Postler, R. Stricker, P. Schindler, R. Blatt, T. Monz, P. Walther, J. F. Fitzsimons
Abstract

Quantum computers are on the brink of surpassing the capabilities of even the most powerful classical computers, which naturally raises the question of how one can trust the results of a quantum computer when they cannot be compared to classical simulation Here, we present a cross-verification technique that exploits the principles of measurement-based quantum computation to link quantum circuits of different input size, depth, and structure. Our technique enables consistency checks of quantum computations between independent devices, as well as within a single device. We showcase our protocol by applying it to five state-of-the-art quantum processors, based on four distinct physical architectures: nuclear magnetic resonance, superconducting circuits, trapped ions, and photonics, with up to six qubits and up to 200 distinct circuits.

Organisation(s)
Quantum Optics, Quantum Nanophysics and Quantum Information
External organisation(s)
VitreaLab GmbH, National University of Singapore (NUS), Singapore University of Technology and Design, Leopold-Franzens-Universität Innsbruck, University of Oxford, Alpine Quantum Technologies GmbH, Horizon Quantum Computing, Vienna Center for Quantum Science and Technology (VCQ), Entrop Labs, Österreichische Akademie der Wissenschaften (ÖAW)
Journal
Physical Review X
Volume
11
No. of pages
15
ISSN
2160-3308
DOI
https://doi.org/10.1103/PhysRevX.11.031049
Publication date
09-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
103025 Quantum mechanics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/crossverification-of-independent-quantum-devices(2f3fcee3-0a49-457c-823c-8ecc572de729).html