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arXiv · 2610.13358

Second quantization and compactness of induced Gaussian quantum Markov semigroups

Zheng Li
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Abstract

We characterize compactness of the Hilbert-Schmidt semigroups induced by finite-mode Gaussian quantum Markov semigroups with a faithful normal invariant state. A unitary second-quantization representation for every $ s $-embedding shows that compactness at one positive time, compact resolvent, drift stability, and uniqueness of the normal invariant state are equivalent. These conditions imply immediate trace-class membership for all embeddings. We derive exact trace-norm and Hilbert--Schmidt norm formulas, an embedding-independent trace identity, and the generator spectrum with algebraic multiplicities. Examples show that compactness does not require the existence of a spectral gap and that a spectral gap need not imply compactness when the invariant state is not unique.

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Zheng Li. 2026-10-09. Second quantization and compactness of induced Gaussian quantum Markov semigroups. https://arxiv.org/abs/2610.13358

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