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Efficient Quantum Algorithms for GHZ and W States, and Implementation on the IBM Quantum Computer (Adv. Quantum Technol. 5‐6/2019)
Author(s) -
Cruz Diogo,
Fournier Romain,
Gremion Fabien,
Jeannerot Alix,
Komagata Kenichi,
Tosic Tara,
Thiesbrummel Jarla,
Chan Chun Lam,
Macris Nicolas,
Dupertuis MarcAndré,
JaverzacGaly Clément
Publication year - 2019
Publication title -
advanced quantum technologies
Language(s) - English
Resource type - Journals
ISSN - 2511-9044
DOI - 10.1002/qute.201970031
Subject(s) - ibm , quantum entanglement , quantum computer , quantum algorithm , algorithm , quantum , fidelity , qubit , computer science , quantum mechanics , physics , theoretical computer science , telecommunications , optics
Entanglement is a fundamental resource in quantum information and technology. In article number 1900015, Clément Javerzac‐Galy and co‐workers investigate efficient new algorithms to create N ‐qubit Greenberger–Horne–Zeilinger (GHZ) and W states with time‐complexity scaling linearly and logarithmically in N . Quantum circuits are implemented on the IBM quantum computer up to N = 16, and entanglement is investigated through tomography (and other methods) as shown in the cover picture. While the fidelity decreases with increasing N , it does so more slowly for the logarithmic algorithms. (Image design by Chun Lam Chan.)