We demonstrate the emission of polarization-entangled photons from a single semiconductor quantum dot in the telecom C-band (1530 nm–1565 nm). To reach this telecommunication window, the well-established material system of InAs quantum dots embedded in InGaAs barriers is utilized with an additional insertion of an InGaAs metamorphic buffer to spectrally shift the system to the desired wavelengths. For the observation of polarization-entangled photon pairs, the biexciton-exciton cascade of a quantum dot displaying an intrinsically low fine-structure splitting is investigated by means of polarization-dependent cross-correlation measurements. A complete set of tomography measurements enables us to reconstruct the two-photon density matrix and therefore to calculate a corresponding fidelity f+ to the maximally entangled Bell state of 0.61 ± 0.07, a concurrence of 0.74 ± 0.11, a tangle of 0.55 ± 0.14, and a negativity of 0.63 ± 0.12, clearly proving the entanglement of the states. Finally, the development of the concurrence is studied in dependency of the post-selected time-gate of the emission events and the progression of the time-delay dependent fidelity to distinct Bell states is displayed.
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Polarization-entangled photons from an InGaAs-based quantum dot emitting in the telecom C-band
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25 September 2017
Research Article|
September 26 2017
Polarization-entangled photons from an InGaAs-based quantum dot emitting in the telecom C-band
Fabian Olbrich;
Fabian Olbrich
a)
Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart
, Allmandring 3, 70569 Stuttgart, Germany
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Jonatan Höschele;
Jonatan Höschele
Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart
, Allmandring 3, 70569 Stuttgart, Germany
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Markus Müller;
Markus Müller
Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart
, Allmandring 3, 70569 Stuttgart, Germany
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Jan Kettler;
Jan Kettler
Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart
, Allmandring 3, 70569 Stuttgart, Germany
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Simone Luca Portalupi;
Simone Luca Portalupi
Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart
, Allmandring 3, 70569 Stuttgart, Germany
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Matthias Paul;
Matthias Paul
Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart
, Allmandring 3, 70569 Stuttgart, Germany
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Michael Jetter
;
Michael Jetter
Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart
, Allmandring 3, 70569 Stuttgart, Germany
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Peter Michler
Peter Michler
Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart
, Allmandring 3, 70569 Stuttgart, Germany
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Appl. Phys. Lett. 111, 133106 (2017)
Article history
Received:
July 04 2017
Accepted:
August 22 2017
Citation
Fabian Olbrich, Jonatan Höschele, Markus Müller, Jan Kettler, Simone Luca Portalupi, Matthias Paul, Michael Jetter, Peter Michler; Polarization-entangled photons from an InGaAs-based quantum dot emitting in the telecom C-band. Appl. Phys. Lett. 25 September 2017; 111 (13): 133106. https://doi.org/10.1063/1.4994145
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