耗散量子隧道系统中的双声子相干态

TWO-PHONON COHERENT STATES IN A DISSIPATIVE QUANTUM TUNNELING SYSTEM

通过引入双声子相干态,本文研究了耗散量子隧道系统中耦合对声子态的影响。与单声子相干态比较,双声子相干态具有以下特点:1)本身的能量被重整化;2)具有更高的相干性,从而减少了声子交迭积分对重整化隧道参量的致窄效应;3)可以使整个系统处于更稳定的基态。

In this paper, a two-phonon coherent state has been introduced to investigate the influence of coupling with a quantum tunneling system on phonon states. Comparing with usual one-phonon coherent state, this new phonon slate has the following properties: (1) Its energy is renormalized by the quantum tunneling system; (2) Its suppression effect on the renormalized tunneling parameter is reduced; (3) It makes the whole system in a more stable ground state.