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- W2759593558 abstract "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 Ψ+ 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." @default.
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- W2759593558 date "2017-09-25" @default.
- W2759593558 modified "2023-10-09" @default.
- W2759593558 title "Polarization-entangled photons from an InGaAs-based quantum dot emitting in the telecom C-band" @default.
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- W2759593558 doi "https://doi.org/10.1063/1.4994145" @default.
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