Anderson, M., Müller, T., Huwer, J. et al. (6 more authors) (2020) Gigahertz-clocked teleportation of time-bin qubits with a quantum dot in the telecommunication C Band. Physical Review Applied, 13 (5). 054052. ISSN 2331-7019
Abstract
Teleportation is a fundamental concept of quantum mechanics with an important application in extending the range of quantum communication channels via quantum relay nodes. To be compatible with real-world technology such as secure quantum key distribution over fiber networks, such a relay node should ideally operate at gigahertz clock rates and accept time-bin-encoded qubits in the low-loss telecom band around 1550 nm. Here, we show that In As-In P droplet-epitaxy quantum dots, with their sub-Poissonian emission near 1550 nm, are ideally suited for the realization of this technology. To create the necessary on-demand photon emission at gigahertz clock rates, we develop a flexible-pulsed optical-excitation scheme and demonstrate that the fast driving conditions are compatible with a low multiphoton emission rate. We show further that, even under these driving conditions, photon pairs obtained from the biexciton cascade show an entanglement fidelity close to 90%, comparable to the value obtained under continuous-wave excitation. Using asymmetric Mach-Zehnder interferometers and our photon source, we finally construct a time-bin qubit quantum relay able to receive and send time-bin-encoded photons and demonstrate mean teleportation fidelities of 0.82 ± 0.01, exceeding the classical limit by more than ten standard deviations.
Metadata
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Copyright, Publisher and Additional Information: | © 2020 American Physical Society. Reproduced in accordance with the publisher's self-archiving policy. | ||||
Keywords: | quant-ph; | ||||
Dates: |
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Institution: | The University of Sheffield | ||||
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) | ||||
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Depositing User: | Symplectic Sheffield | ||||
Date Deposited: | 04 May 2020 13:13 | ||||
Last Modified: | 16 Jun 2020 14:43 | ||||
Status: | Published | ||||
Publisher: | American Physical Society | ||||
Refereed: | Yes | ||||
Identification Number: | https://doi.org/10.1103/PhysRevApplied.13.054052 | ||||
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