{"references": ["W. R. Clements, P. C. Humphreys, B. J. Metcalf, W. S. Kolthammer, and I. A. Walsmley, \"Optimal Design for Universal Multiport Interferometers\", Optica 3, 1460 (2016).", "J. Skaar, J. C. Garc\u00eda Escart\u00edn, and H. Landro, \"Quantum mechanical description of linear optic\", American Journal of Physics 72, 1385 (2004).", "S. Scheel, \"Permanents in linear optics network\", Acta Physica Slovaca 58, 675 (2008).", "\"Permanents and Ryser's algorithm\", numbersandshapes.net.", "J. C. Garc\u00eda Escart\u00edn, V. Gimeno, and J. J. Moyano-Fern\u00e1ndez, \"Multiple photon effective Hamiltonians in linear quantum optical networks\", Optics Communications 430 (2019) 434\u2013439.", "J. C. Garc\u00eda Escart\u00edn, V. Gimeno, and J. J. Moyano Fern\u00e1ndez, \"A method to determine which quantum operations can be realized with linear optics with a constructive implementation recipe\", Physical Review A 100, 022301 (2019).", "J. C. Garc\u00eda Escart\u00edn and J. J. Moyano Fern\u00e1ndez, \"Optimal approximation to unitary quantum operators with linear optics\", arXiv:2011.15048v1 [quant-ph].", "N. Tischler, C. Rockstuhl, and K. Slowik, \"Quantum Optical Realization of Arbitrary Linear Transformations Allowing for Loss and Gain\", Physical Review X 8, 021017 (2018).", "T. A. Loring, \"Computing a logarithm of a unitary matrix with general spectrum\", Numerical Linear Algebra wth Applications, 21 (6) 744\u2013760 (2014).", "D. G. Aguado, V. Gimeno, J. J. Moyano-Fern \u0301andez, and J. C. Garcia-Escartin, QOptCraft: A Python package for the design and study of linear optical quantum systems, Computer Physics Communica- tions 282, 108511 (2023)"]}

QOptCraft is a Python package for the design and study of linear optical quantum systems. Functions include: Reck and Clemens optical decomposition of unitaries. Unitary approximation with linear optics using Toponogov's theorem Photonic homomorphism to quantize linear optical interferometers Recover, if possible, the linear optical scattering matrix from a unitary operator Create pure and mixed states in a handy way Calculate photonic invariants of states

Pablo V. Parellada has been funded by the European Union NextGenerationEU (PRTRC17.I1) and the Consejería de Educación, Junta de Castilla y León, through QCAYLE project. D. Gómez Aguado has been supported by the Spanish Government (Ministerio de Educación y Formación Profesional, Beca de Colaboración en Departamentos Universitarios).