TY  - JOUR
A1  - Lüders, Carolin
A1  - Pukrop, Matthias
A1  - Rozas, Elena
A1  - Schneider, Christian
A1  - Höfling, Sven
A1  - Sperling, Jan
A1  - Schumacher, Stefan
A1  - Aßmann, Marc
T1  - Quantifying Quantum Coherence in Polariton Condensates
JF  - PRX Quantum
N2  - We theoretically and experimentally investigate quantum features of an interacting light-matter system from a multidisciplinary perspective, combining approaches from semiconductor physics, quantum optics, and quantum-information science. To this end, we quantify the amount of quantum coherence that results from the quantum superposition of Fock states, constituting a measure of the resourcefulness of the produced state for modern quantum protocols. This notion of quantum coherence from quantum-information theory is distinct from other quantifiers of nonclassicality that have previously been applied to condensed-matter systems. As an archetypal example of a hybrid light-matter interface, we study a polariton condensate and implement a numerical model to predict its properties. Our simulation is confirmed by our proof-of-concept experiment in which we measure and analyze the phase-space distributions of the emitted light. Specifically, we drive a polariton microcavity across the condensation threshold and observe the transition from an incoherent thermal state to a coherent state in the emission, thus confirming the buildup of quantum coherence in the condensate itself.
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-369644
VL  - 2
ER  -