Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Focus Session: Quantum Light Sources Based on Solid State Systems: Status and Visions I (organized by HL)
TT 41.2: Vortrag
Dienstag, 1. April 2014, 10:00–10:15, POT 251
On-demand generation of indistinguishable polarization-entangled photon pairs — •Markus Müller1, Samir Bounouar1, Klaus D. Jöns1, Martin Glässl2, and Peter Michler1 — 1Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany — 2Institut für Theoretische Physik III, Universität Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
The development of quantum information science using linear optics has made substantial progress in the recent past. This advance is mainly based on the ability to generate high-quality photonic qubits from various kinds of different sources. Furthermore, for practical quantum information operations it is essential to create the qubits deterministically. In this work we show that semiconductor quantum dots (QDs) are suitable to fulfill both of this elementary requirements. To exploit their remarkable properties, a coherent resonant two-photon excitation scheme is applied. Thereby the biexciton state of an InGaAs QD is populated with a near unity preparation efficiency. Because of this individual and coherent addressing, the photons emitted by the biexciton-exciton cascade show enhanced optical and quantum-optical qualities. This is reflected in pure single-photon emission, long coherence times and high indistinguishability visibilities (VHOM = 0.86 ± 0.03 and 0.71 ± 0.04) for the biexcitonic and excitonic emission, respectively. Taking advantage of a QD without fine structure splitting, we can demonstrate the on-demand generation (pair-efficiency = 0.86 ± 0.08) of high fidelity (0.81 ± 0.02) polarization-entangled photon pairs.