DESY, one of the world's leading research centers located in Hamburg, Germany, is seeking a motivated PhD student to join a project focused on applying information field theory to coherent phase contrast imaging, with a particular emphasis on ptychography at synchrotrons. Ptychography is a cutting-edge super resolution phase retrieval imaging technique capable of achieving resolutions down to single-digit nanometres. The project aims to leverage the emerging framework of information field theory to theoretically evaluate the impact of experimental parameters such as degree of coherence, photon flux, and probe shape on ptychographic image quality. The research will also involve optimizing these parameters to improve image quality, with theoretical findings validated through experiments conducted at the P06 beamline at the Petra III Synchrotron facility. The successful candidate will apply information field theory to assess experimental impacts, perform hands-on experiments at synchrotron beamlines, and investigate the quantification of information in ptychography data. Applicants should hold a Master's degree in Physics, Mathematics, Computer Science, or a related field, possess strong mathematical skills, have experience with programming (Python, C++, CUDA), and demonstrate knowledge of information theory. The position offers a unique international research environment, flexible working hours, family-friendly policies, health management, occupational pension provision, and a secure workplace with comprehensive training and development opportunities. PhD students receive a monthly salary of 67% of the payment of the remuneration group 13 TVöD (Federal Government), with additional financial support for a German job ticket. DESY collaborates with the University of Hamburg for doctoral degrees, and candidates must meet the university's admission requirements. Applications from women and severely disabled persons are strongly encouraged. The application deadline is November 27, 2025. For further information, contact Ken Vidar Falch at ken.vidar.falch@desy.de.