Entropy and Variance Squeezing of V-type Atom in Dissipative Cavity

2026/01/31 by Zijin Liang, Qiying Pan, Hong-Mei Zou +1
Physics and Astronomy · #quant-ph

paper · pdf

Withdrawal due to errors: (1) entropy squeezing calculated with wrong information entropy, inconsistent with cited entropic uncertainty relation Eq. (25); (2) basis inconsistency between spin operators and reduced density matrix

arxiv created 2026/08/05 · arxiv updated 2026/08/06

Abstract

Based on Ref.\citeRiccardi A, we investigate the entropy and variance squeezing of a V-type atom in a dissipative cavity, and discuss the influences of parameters including the spontaneously generated interference (SGI) (θ), the cavity-environment coupling (γ₀/κ) and the atom-cavity detuning (Δ) on the atomic squeezing by using different initial states. The results show that no squeezing of S_y occurs under any condition and that variance squeezing of S_x appears only when Δ>0. Entropy squeezing quantifies quantum fluctuations more precisely than variance squeezing. Moreover, the atomic squeezing of S_x clearly depends on θ, γ₀/κ, Δ and the initial state. These findings are meaningful for quantum information processing as an ultra-low-noise resource.

Citations

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• �ber den anschaulichen Inhalt der quantentheoretischen Kinematik und Mechanik