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Quantum communication complexity using the quantum Zeno effect
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-3031-1227
Stockholm University, Faculty of Science, Department of Physics.
Number of Authors: 4
2015 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 92, no 1, 012303Article in journal (Refereed) Published
Abstract [en]

The quantum Zeno effect (QZE) is the phenomenon in which the unitary evolution of a quantum state is suppressed, e.g., due to frequent measurements. Here, we investigate the use of the QZE in a class of communication complexity problems (CCPs). Quantum entanglement is known to solve certain CCPs beyond classical constraints. However, recent developments have yielded CCPs for which superclassical results can be obtained using only communication of a single d-level quantum state (qudit) as a resource. In the class of CCPs considered here, we show quantum reduction of complexity in three ways: using (i) entanglement and the QZE, (ii) a single qudit and the QZE, and (iii) a single qudit. We have performed a proof of concept experimental demonstrations of three party CCP protocol based on single-qubit communication with and without QZE.

Place, publisher, year, edition, pages
2015. Vol. 92, no 1, 012303
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-119132DOI: 10.1103/PhysRevA.92.012303ISI: 000357161200003OAI: oai:DiVA.org:su-119132DiVA: diva2:843779
Available from: 2015-07-31 Created: 2015-07-29 Last updated: 2017-12-04Bibliographically approved

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