CUED Publications database

Quantum-dot-based telecommunication-wavelength quantum relay

Huwer, J and Stevenson, RM and Skiba-Szymanska, J and Ward, MB and Shields, AJ and Felle, M and Farrer, I and Ritchie, DA and Penty, RV (2017) Quantum-dot-based telecommunication-wavelength quantum relay. Physical Review Applied, 8. 024007-. ISSN 2331-7019

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© 2017 American Physical Society. The development of quantum relays for long-haul and attack-proof quantum communication networks operating with weak coherent laser pulses requires entangled photon sources at telecommunication wavelengths with intrinsic single-photon emission for most practical implementations. Using a semiconductor quantum dot emitting entangled photon pairs in the telecommunication O band, we demonstrate a quantum relay fulfilling both of these conditions. The system achieves a maximum fidelity of 94.5% for implementation of a standard four-state protocol with input states generated by a laser. We further investigate robustness against frequency detuning of the narrow-band input and perform process tomography of the teleporter, revealing operation for arbitrary pure input states, with an average gate fidelity of 83.6%. The results highlight the potential of semiconductor light sources for compact and robust quantum-relay technology that is compatible with existing communication infrastructures.

Item Type: Article
Uncontrolled Keywords: quant-ph quant-ph
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:18
Last Modified: 10 Apr 2021 00:46
DOI: 10.1103/PhysRevApplied.8.024007