Subvacuum effects of the quantum field on the dynamics of a test particle

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題名:	Subvacuum effects of the quantum field on the dynamics of a test particle
作者:	項人宗;Wu, Tai-Hung;Hsiang, Jen-Tsung;Lee, Da-Shin
貢獻者:	理學院物理學系
關鍵詞:	Atoms & subatomic particles;Dispersions;Dynamic tests;Dynamics;Evolution;Fluctuation;Langevin equation;Nonequilibrium quantum field theory;Particles (of physics);Quantum physics;Reduction;Subvacuum effect;Switching
日期:	2012-02-01
上傳時間:	2026-04-23 14:37:11 (UTC+8)
出版者:	New York: Elsevier Inc
摘要:	摘要： We study the effects of the electromagnetic subvacuum fluctuations on the dynamics of a nonrelativistic charged particle in a wavepacket. The influence from the quantum field is expected to give an additional effect to the velocity uncertainty of the particle. In the case of a static wavepacket, the observed velocity dispersion is smaller in the electromagnetic squeezed vacuum background than in the normal vacuum background. This leads to the subvacuum effect. The extent of reduction in velocity dispersion associated with this subvacuum effect is further studied by introducing a switching function. It is shown that the slow switching process may make this subvacuum effect insignificant. We also point out that when the center of the wavepacket undergoes non-inertial motion, reduction in the velocity dispersion becomes less effective with its evolution, no matter how we manipulate the nonstationary quantum noise via the choice of the squeeze parameters. The role of the underlying fluctuation–dissipation relation is discussed. ► We are interested in suppression of quantum noise. ► The model system is a charge interacting with a quantized EM field. ► The velocity uncertainty of the static charge is reduced in EM squeezed vacuum. ► Squeezed vacuum is ineffective if a charge undergoes oscillatory motion. ► The noise reduction capability depends on how interaction is turned on. 出版者： New York: Elsevier Inc 出版日期： 2012-02-01 出處： Annals of physics, 2012-02, Vol.327 (2), p.522-541 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2011 Elsevier Inc. 版權： Copyright © 2012 Elsevier B.V. All rights reserved. 識別號： ISSN: 0003-4916 識別號： EISSN: 1096-035X 識別號： DOI: 10.1016/j.aop.2011.11.011 識別號： CODEN: APNYA6
顯示於類別:	[物理學系] 期刊論文

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