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Q: Fachverband Quantenoptik und Photonik
Q 40: Quantum Optics and Nuclear Quantum Optics II
Q 40.5: Talk
Wednesday, March 12, 2025, 15:30–15:45, AP-HS
Heralded squeezed coherent state superpositions via optical catalysis — •Roger Kögler1, Elnaz Bazzazi1, Ananga Datta1, Julian Nauth2, Nathan Walk2, Marco Schmidt1, and Oliver Benson1 — 1Humboldt-Universität zu Berlin, Institut für Physik, Newtonstraße 15, 12489, Berlin, Germany — 2Dahlem Center for Complex Quantum Systems, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
Non-Gaussian states of light are strong candidates for fault tolerant-encoding and error correction in future quantum computation implementations. Their experimental generation, however, remains challenging and relies in different quantum state engineering techniques. In this work, we investigate a photon catalysis-like protocol and its suitability for generating high-amplitude squeezed coherent state superpositions (SCSS) in optical platforms. The method involves the interference of squeezed and Fock states at a beamsplitter, followed by a photon number resolving (PNR) detection in one of the output modes. The remaining mode is thereby projected into a state determined by the resource states, the beamsplitter splitting ration, and the PNR outcome. Analytical results are used to evaluate different output states and their overlap with target SCSS states. The impact of losses on the protocol is studied using numerical simulations, with results visualized in phase-space representations. This study is conducted in parallel with its experimental implementation, aiming toward the optical tomography of catalyzed states.
Keywords: Non-Gaussian states; Coherent state superposition; Quantum state engineering; Optical tomography