The 20th International Conference on Quantum Physics and Logic (QPL 2023) will take place from 17 July to 21 July 2023 at the "Institut Henri Poincar??" in Paris, France. Quantum Physics and Logic is an annual conference that brings together academic and industry researchers working on mathematical foundations of quantum computation, quantum physics, and related areas. The main focus is on the use of algebraic and categorical structures, formal languages, type systems, semantic methods, as well as other mathematical and computer scientific techniques applicable to the study of physical systems, physical processes, and their composition. Work applying quantum-inspired techniques and structures to other fields (such as linguistics, artificial intelligence, and causality) is also welcome. The conference website is https://qpl2023.github.io/ ======================================= Important Dates ======================================= Abstract submission deadline: 12 March 2023 (updated) Paper submission deadline: 17 March 2023 (updated) Notification: 1 May 2023 Conference: 17 July ??? 21 July 2023 All deadlines are stated with respect to the Anywhere on Earth (AoE) time zone. ======================================= Submissions ======================================= Prospective speakers are invited to submit one (or more) of the following: * Proceedings submission. This consists of a 5-12 page paper. It must provide sufficient evidence of results of genuine interest, in sufficient detail for the program committee to assess the merits of the work. Submissions of work in progress are encouraged, but must be more substantial than a research proposal. Proceedings submissions should use the EPTCS style files. * Non-proceedings submission. This consists of a 3 page summary, together with a link to a separate published paper or preprint. If the published paper or preprint is not publicly available (e.g., not open access), then it should be included in full after the summary. * Poster submission. This consists of a 3 page abstract of partial results or work in progress. * Programming tool submission. This consists of a 3 page description of a programming tool or framework, with a strong preference for open-source contributions. Submission is via Easychair at the following URL: https://www.easychair.org/my/conference?conf=qpl2023 ======================================= Presentations ======================================= Authors of accepted proceedings and non-proceedings submissions will be invited to give a long or short talk, depending on the quality and maturity of the submission. Authors of accepted poster submissions will be invited to present their work at the poster session. Authors of accepted programming tool submissions will be invited to live demo their tool to conference attendees, at the same time as the poster session. There will be an award for Best Student Paper at the discretion of the Program Committee. Papers eligible for the award are those where all the authors are students at the time of submission. ======================================= Conference Proceedings ======================================= Conference proceedings will be published in Electronic Proceedings in Theoretical Computer Science (EPTCS) after the conference. Please consult the website for more information about committees, local arrangements, etc. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]