Controlling the photon number coherence of solid-state quantum light sources for quantum cryptography

Autor(en)

Yusuf Karli, Daniel A. Vajner, Florian Kappe, Paul C.A. Hagen, Lena M. Hansen, René Schwarz, Thomas K. Bracht, Christian Schimpf, Saimon F. Covre da Silva, Philip Walther, Armando Rastelli, Vollrath Martin Axt, Juan C. Loredo, Vikas Remesh, Tobias Heindel, Doris E. Reiter, Gregor Weihs

Abstrakt

Quantum communication networks rely on quantum cryptographic protocols including quantum key distribution (QKD) based on single photons. A critical element regarding the security of QKD protocols is the photon number coherence (PNC), i.e., the phase relation between the vacuum and one-photon Fock state. To obtain single photons with the desired properties for QKD protocols, optimal excitation schemes for quantum emitters need to be selected. As emitters, we consider semiconductor quantum dots, that are known to generate on-demand single photons with high purity and indistinguishability. Exploiting two-photon excitation of a quantum dot combined with a stimulation pulse, we demonstrate the generation of high-quality single photons with a controllable degree of PNC. The main tuning knob is the pulse area giving full control from minimal to maximal PNC, while without the stimulating pulse the PNC is negligible in our setup for all pulse areas. Our approach provides a viable route toward secure communication in quantum networks.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

Leopold-Franzens-Universität Innsbruck, Technische Universität Berlin, Universität Bayreuth, Technische Universität Dortmund, Universität Münster, Johannes Kepler Universität Linz

Journal

npj Quantum Information

Band

10

Anzahl der Seiten

9

ISSN

2056-6387

DOI

https://doi.org/10.48550/arXiv.2305.20017

Publikationsdatum

01-2024

Peer-reviewed

Ja

ÖFOS 2012

103025 Quantenmechanik, 103021 Optik

ASJC Scopus Sachgebiete

Computer Science (miscellaneous), Statistical and Nonlinear Physics, Computer Networks and Communications, Computational Theory and Mathematics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/91b984a6-15d6-43fb-b786-a1d2d3cbeee8