Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 14: Quantum Information Poster Session
QI 14.22: Poster
Wednesday, March 11, 2026, 18:00–21:00, P4
Qubit analogues in exciton-polariton condensates with optical manipulation — •Roman Lebs1, Jan Wingenbach1,2, Hendrik Rose2, and Stefan Schumacher1,2 — 1Physics Department and CeOPP, Paderborn University, Germany — 2PhoQS, Paderborn University, Germany
Exciton-polariton condensates provide a promising platform for quantum information processing, offering long coherence times, robust information storage and operation up to room temperature. Here we build upon earlier demonstrations of vortex-based information encoding (Ma et al., Nat. Commun. 11, 897, 2020), split ring qubit analogues (Xue et al., Phys. Rev. Research 3, 013099, 2021), and recent progress toward polaritonic qubit prototypes in annular traps (Barrat et al., Science Advances 10, eado4042, 2024), investigating a polariton condensate as a fully optically controllable qubit analogue. The condensate dynamics are modelled using the nonlinear Gross-Pitaevskii equation and numerically solved with PHOENIX, a highly optimized CUDA accelerated solver for two-dimensional nonlinear Schrödinger equations (Wingenbach et al., Comput. Phys. Commun. 315, 109689, 2025), which enables efficient and high-resolution simulations. We show that all points of the Bloch sphere can be reached by encoding the |0 ⟩ and |1 ⟩ states as localized spatial profiles with distinct phases. A simple pump geometry, combining a ring pump and a Gaussian pump applied on the ring, allows precise control of trajectories on the Bloch sphere. We also outline how this scheme can be extended toward coupled condensates in multi qubit architectures.
Keywords: Exciton-polariton condensates; Qubit analogue; Gross-Pitaevskii equation; PHOENIX; Bloch sphere control