= Takafumi Kita
{c}
{tag=Physicist}
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.<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]{ref}
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