A theoretical physicist who, with Kazumasa Tsutsui, derived reduced density matrices for ideal Bose gas and Fermi gas systems with fixed particle number. Their 2016 analysis distinguishes the canonical ensemble from familiar grand canonical ensemble applications of Wick's theorem, making explicit which particle-number assumptions enter calculations of quantum correlations.[ref]
Quantum Correlations of Ideal Bose and Fermi Gases in the Canonical Ensemble by Kazumasa Tsutsui and Takafumi Kita. Abstract: canonical reduced density matrices and comparison with grand-canonical Wick factorization
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