Squeezing Effect of a Nanomechanical Resonator Coupled to a Two-Level System:an Equilibrium Approach

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2009,（3）
• 页码范围: 292-295
• 页数: 4页
• 语种: 英文

摘要

The squeezing effect of a nanomechanical resonator coupled to a two-level system is studied by variational calculations based on both the displaced-squeezed-state (DSS) and the displaced-oscillator-state (DOS).The stable region of the DSS ground state at both T = 0 and T≠0 and the corresponding squeezing factor are alculated.It is found that when the resonator frequency lies in (kBT,△),where △ is the tunnelling splitting of the two-level-system in the presence of dissipation,tunnelling splitting of a DSS ground state decreases with the temperature,while tunnelling splitting of a DOS ground state increases with the temperature in low temperature region.This opposite temperature dependence can help to distinguish between the DSS and DOS ground state in the experiment.