Experimental quantum communication enhancement by superposing trajectories

Autor(en)

Giulia Rubino, Lee A. Rozema, Daniel Ebler, Hlér Kristjánsson, Sina Salek, Philippe Allard Guérin, Alastair A. Abbott, Cyril Branciard, Časlav Brukner, Giulio Chiribella, Philip Walther

Abstrakt

In quantum communication networks, wires represent well-defined trajectories along which quantum systems are transmitted. In spite of this, trajectories can be used as a quantum control to govern the order of different noisy communication channels, and such a control has been shown to enable the transmission of information even when quantum communication protocols through well-defined trajectories fail. This result has motivated further investigations on the role of the superposition of trajectories in enhancing communication, which revealed that the use of quantum control of parallel communication channels, or of channels in series with quantum-controlled operations, can also lead to communication advantages. Building upon these findings, here we experimentally and numerically compare different ways in which two trajectories through a pair of noisy channels can be superposed. We observe that, within the framework of quantum interferometry, the use of channels in series with quantum-controlled operations generally yields the largest advantages. Our results contribute to clarify the nature of these advantages in experimental quantum-optical scenarios, and showcase the benefit of an extension of the quantum communication paradigm in which both the information exchanged and the trajectory of the information carriers are quantum.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation, Forschungsverbund Quantum Aspects of Space Time

Externe Organisation(en)

Southern University of Science and Technology, University of Oxford, University of Hong Kong, Fujitsu Laboratories of Europe Limited, Österreichische Akademie der Wissenschaften (ÖAW), Universität Genf, Institut NÉEL (CNRS), Perimeter Institute for Theoretical Physics

Journal

Physical Review Research

Band

3

Anzahl der Seiten

19

ISSN

2643-1564

DOI

https://doi.org/10.1103/PhysRevResearch.3.013093

Publikationsdatum

01-2021

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik, 103026 Quantenoptik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5807c0f6-eadd-4cf7-a8b6-c075962cbac4