Strain-controlled quantum dot fine structure for entangled photon generation at 1550 nm
- Entangled photon generation at 1550 nm in the telecom C-band is of critical importance as it enables the realization of quantum communication protocols over long distance using deployed telecommunication infrastructure. InAs epitaxial quantum dots have recently enabled on-demand generation of entangled photons in this wavelength range. However, time-dependent state evolution, caused by the fine-structure splitting, currently limits the fidelity to a specific entangled state. Here, we show fine-structure suppression for InAs quantum dots using micromachined piezoelectric actuators and demonstrate generation of highly entangled photons at 1550 nm. At the lowest fine-structure setting, we obtain a maximum fidelity of 90.0 ± 2.7% (concurrence of 87.5 ± 3.1%). The concurrence remains high also for moderate (weak) temporal filtering, with values close to 80% (50%), corresponding to 30% (80%) of collected photons, respectively. The presented fine-structure control opens the way for exploiting entangled photons from quantum dots in fiber-based quantum communication protocols.
Author: | Thomas Lettner, Samuel Gyger, Katharina D. Zeuner, Lucas Schweickert, Stephan Steinhauer, Carl Reuterskiöld Hedlund, Sandra StrojORCiD, Armando Rastelli, Mattias Hammar, Rinaldo Trotta, Klaus D. Jöns, Val Zwiller |
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DOI: | https://doi.org/10.1021/acs.nanolett.1c04024 |
ISSN: | 1530-6984 |
ISSN: | 1530-6992 |
Parent Title (English): | Nano Letters |
Document Type: | Article |
Language: | English |
Year of publication: | 2021 |
Release Date: | 2022/01/19 |
Tag: | Entangled photons; Fine-structure splitting; Quantum state tomography; Semiconductor quantum dots; Strain tuning |
Volume: | 21. Jg. |
Issue: | H. 24 |
First Page: | 10501 |
Last Page: | 10506 |
Organisationseinheit: | Forschung / Forschungszentrum Mikrotechnik |
DDC classes: | 500 Naturwissenschaften und Mathematik / 530 Physik |
Open Access?: | ja |
Peer review: | wiss. Beitrag, peer-reviewed |
Publicationlist: | Stroj, Sandra |
Licence (German): | Creative Commons - CC BY - International - Attribution- Namensnennung 4.0 |