Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 5: Quantum Dots and Wires: Single Photon Sources

HL 5.2: Vortrag

Montag, 7. März 2016, 10:00–10:15, H15

Phase super-resolution with N00N-states generated by on demand single-photon sources — •M. Müller, H. Vural, S. L. Portalupi, and P. Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Allmandring 3, 70569 Stuttgart, Germany

Quantum metrology is a promising scientific field taking advantage of the probably most fundamental aspect of quantum mechanics, namely entanglement. Enhanced optical phase sensing for instance, which utilizes multi-photon entangled states has attracted a lot of attention in the community. Up to now, so called path-entangled N00N states have been generated by light sources possessing probabilistic photon statistics, e. g., parametric-down conversion. Here we present the experimental generation of two-photon N00N states with a single quantum emitter making use of the radiative biexciton-exciton cascade in a single semiconductor quantum dot. A resonant and coherent two-photon excitation process ensures the deterministic preparation of the quantum dot states. The subsequently emitted single-photons possess a reasonable indistinguishability for the production of the excitonic and biexcitonic two-photon N00N states. Phase super-resolution, i. e., a reduced de-Broglie wavelength of the photonic wave packet, expressed by pronounced oscillations with twice the single photon frequency, is observed. Theoretical calculations are in excellent agreement with the experimental results, allowing for a complete description of the system. Prospects and limitations related to optical phase measurements with a precision beating the standard quantum limit involving quantum dot single-photon sources will be discussed.