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journal article Open Access Apr 16, 2021

Quantum cryptography with highly entangled photons from semiconductor quantum dots

Christian Schimpf ORCID Marcus Reindl ORCID Daniel Huber ORCID Barbara Lehner Saimon F. Covre da Silva ORCID Santanu Manna ORCID Michal Vyvlecka ORCID Philip Walther ORCID Armando Rastelli ORCID
Science Advances Vol. 7 No. 16 · American Association for the Advancement of Science (AAAS)
View at Publisher Save 10.1126/sciadv.abe8905
Abstract
Semiconductor quantum dots are capable of emitting polarization entangled photon pairs with ultralow multipair emission probability even at maximum brightness. Using a quantum dot source with a fidelity as high as 0.987(8), we implement here quantum key distribution with an average quantum bit error rate as low as 1.9% over a time span of 13 hours. For a proof of principle, the key generation is performed with the BBM92 protocol between two buildings, connected by a 350-m-long fiber, resulting in an average raw (secure) key rate of 135 bits/s (86 bits/s) for a pumping rate of 80 MHz, without resorting to time- or frequency-filtering techniques. Our work demonstrates the viability of quantum dots as light sources for entanglement-based quantum key distribution and quantum networks. By increasing the excitation rate and embedding the dots in state-of-the-art photonic structures, key generation rates in the gigabits per second range are in principle at reach.
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Metrics
127
Citations
57
References
Details
Published
Apr 16, 2021
Vol/Issue
7(16)
License
View
Authors
C
Christian Schimpf

Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria.

M
Marcus Reindl

Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria.

D
Daniel Huber

Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria.

B
Barbara Lehner

Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria.

S
Saimon F. Covre da Silva

Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria.

S
Santanu Manna

Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria.

M
Michal Vyvlecka

Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, Vienna, Austria.; Doppler Laboratory for Photonic Quantum Computers, Faculty of Physics, University of Vienna, Vienna, Austria.

P
Philip Walther

Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna, Vienna, Austria.; Doppler Laboratory for Photonic Quantum Computers, Faculty of Physics, University of Vienna, Vienna, Austria.

A
Armando Rastelli

Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz, Linz, Austria.

Funding
Austrian Science Fund Award: P29603, P30459, I4320
Linz Institute of Technology
Cite This Article
Christian Schimpf, Marcus Reindl, Daniel Huber, et al. (2021). Quantum cryptography with highly entangled photons from semiconductor quantum dots. Science Advances, 7(16). https://doi.org/10.1126/sciadv.abe8905
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