摘要
Counter-rotating-wave terms(CRWTs)are traditionally viewed to be crucial in open small quantum systems with strong system–bath dissipation.Here by exemplifying in a nonequilibrium qubit–phonon hybrid model,we show that CRWTs can play the significant role in quantum heat transfer even with weak system–bath dissipation.By using extended coherent phonon states,we obtain the quantum master equation with heat exchange rates contributed by rotating-waveterms(RWTs)and CRWTs,respectively.We find that including only RWTs,the steady state heat current and current fluctuations will be significantly suppressed at large temperature bias,whereas they are strongly enhanced by considering CRWTs in addition.Furthermore,for the phonon statistics,the average phonon number and two-phonon correlation are nearly insensitive to strong qubit–phonon hybridization with only RWTs,whereas they will be dramatically cooled down via the cooperative transitions based on CRWTs in addition.Therefore,CRWTs in quantum heat transfer system should be treated carefully.
作者
Chen Wang
Lu-Qin Wang
Jie Ren
王晨;王鲁钦;任捷(Department of Physics,Zhejiang Normal University,Jinhua 321004,China;Center for Phononics and Thermal Energy Science,China-EU Joint Center for Nanophononics,Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,School of Physics Science and Engineering,Tongji University,Shanghai 200092,China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.11704093,11775159,and 11935010)
the Natural Science Foundation of Shanghai,China(Grant Nos.18ZR1442800 and 18JC1410900)
the Opening Project of Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology.
作者简介
Corresponding author:王晨,E-mail:wangchenyifang@gmail.com;Corresponding author:任捷,E-mail:Xonics@tongji.edu.cn。
