%0 Journal Article %1 PRXQuantum.2.030320 %A Lüders, Carolin %A Pukrop, Matthias %A Rozas, Elena %A Schneider, Christian %A Höfling, Sven %A Sperling, Jan %A Schumacher, Stefan %A Aßmann, Marc %D 2021 %I American Physical Society %J PRX Quantum %K c %N 3 %P 030320 %R 10.1103/PRXQuantum.2.030320 %T Quantifying quantum coherence in polariton condensates %U https://link.aps.org/doi/10.1103/PRXQuantum.2.030320 %V 2 %X 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.

@article{PRXQuantum.2.030320, abstract = {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.}, added-at = {2023-11-16T14:01:04.000+0100}, author = {L\"uders, Carolin and Pukrop, Matthias and Rozas, Elena and Schneider, Christian and H\"ofling, Sven and Sperling, Jan and Schumacher, Stefan and A\ss{}mann, Marc}, biburl = {https://www.bibsonomy.org/bibtex/259de3f0553b1d589bfaf82719d5704ce/ctqmat}, day = 04, doi = {10.1103/PRXQuantum.2.030320}, interhash = {c4f6df882bf6823485d4cdc832c48d68}, intrahash = {59de3f0553b1d589bfaf82719d5704ce}, journal = {PRX Quantum}, keywords = {c}, month = {08}, number = 3, numpages = {19}, pages = 030320, publisher = {American Physical Society}, timestamp = {2023-11-16T14:01:04.000+0100}, title = {Quantifying quantum coherence in polariton condensates}, url = {https://link.aps.org/doi/10.1103/PRXQuantum.2.030320}, volume = 2, year = 2021 }