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Husimi Q representation
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<p> The Husimi Q representation, introduced by <a href="/facts/K%25C3%25B4di_Husimi/gEsETtvP">Kôdi Husimi</a> in 1940, is a <a href="/facts/Quasiprobability_distribution/9na2lTH2">quasiprobability distribution</a> commonly used in <a href="/facts/Quantum_mechanics/BRc3Mzgr">quantum mechanics</a> to represent the <a href="/facts/Phase_space/qPe4Fq57">phase space</a> distribution of a <a href="/facts/Quantum_state/7jbxd7Dx">quantum state</a> such as <a href="/facts/Light/jeofpMn4">light</a> in the <a href="/facts/Phase_space_formulation/ogvtdMNs">phase space formulation</a>. It is used in the field of <a href="/facts/Quantum_optics/xcvuB9n9">quantum optics</a> and particularly for <a href="/facts/Tomography/HGqzMl2s">tomographic</a> purposes. It is also applied in the study of <a href="/facts/Quantum/4x5QTxGB">quantum</a> effects in <a href="/facts/Type-I_superconductor/xsosaCVK">superconductors</a>. </p>