Last Updated
：2025/12/02
Wick's theorem
Proper noun
Japanese Meaning
量子力学において、高次の演算子の積（例えば創造演算子と消滅演算子）の和を、ペアごとの積の和として表現するための定理。特に、複雑な演算子の積を組み合わせ論的な問題に還元する方法として用いられる。
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(quantum mechanics) A method of reducing high-order derivatives to a combinatorics problem, used extensively in quantum field theory to reduce arbitrary products of creation and annihilation operators to sums of products of pairs of these operators.
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Wick's theorem
Wick's theorem allows us to reduce time-ordered products of field operators to sums of pairwise contractions, greatly simplifying perturbative calculations in quantum field theory.
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Wick's theorem allows us to reduce time-ordered products of field operators to sums of pairwise contractions, greatly simplifying perturbative calculations in quantum field theory.
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