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Di Matteo, Olivia Sánchez Soto, Luis Lorenzo Leuchs, Gerd Grassl, M. 2023-06-17T21:55:42Z 2023-06-17T21:55:42Z 2017-02-28 2469-9926 10.1103/PhysRevA.95.022340 https://hdl.handle.net/20.500.14352/17800 http://dx.doi.org/10.1103/PhysRevA.95.022340 https://journals.aps.org We develop a systematic coarse-graining procedure for systems of N qubits. We exploit the underlying geometrical structures of the associated discrete phase space to produce a coarse-grained version with reduced effective size. Our coarse-grained spaces inherit key properties of the original ones. In particular, our procedure naturally yields a subset of the original measurement operators, which can be used to construct a coarse discrete Wigner function. These operators also constitute a systematic choice of incomplete measurements for the tomographer wishing to probe an intractably large system. eng open access Coarse graining the phase space of N qubits journal article