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arXiv 2304.00518quant-ph
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自洽马尔可夫主方程中的例外点

Exceptional point in self-consistent Markovian master equations

Dong Xie, Chunling Xu

AI总结:

该研究针对传统局部马尔可夫主方程在耦合系统中构造例外点(EP)的不自洽问题,采用自洽马尔可夫主方程证明双玻色子子系统无EP,明确了传统方程的适用条件,并给出三子系统构造EP的方法。

摘要:

例外点(EP)指非厄米简并点,此时本征值与本征态均完全重合。利用传统局部马尔可夫主方程,可在由耦合子系统构成的系统中通过宇称-时间(PT)或反PT对称性构造EP。然而,两个系统间的耦合会导致传统局部马尔可夫主方程出现不自洽问题。通过采用自洽马尔可夫主方程,我们证明由两个玻色子子系统构成的系统中不存在EP。我们进一步证明,传统局部主方程仅在耦合强度远小于两个子系统的共振频率差(而非共振频率本身)时才成立。在由三个玻色子子系统构成的系统中,可通过绝热消除三个子系统中的一个来获得EP。

英文摘要:

Exceptional point (EP) denotes the non-Hermitian degeneracy, in which both eigenvalues and eigenstates become identical. By the conventional local Markovian master equation, EP can be constructed by parity-time (PT) or anti-PT symmetry in a system composed of coupled subsystems. However, the coupling between two systems makes the conventional local Markovian master equation become inconsistent. By using the self-consistent Markovian master equation, we show that there is no EP in the system composed of two bosonic subsystems. We further prove that the conventional local master equation can be valid only when the coupling strength is much smaller than the difference in resonance frequency between the two subsystems, rather than the resonance frequencies. In a system composed of three bosonic subsystems, EP can be obtained by adiabatically eliminating one of the three subsystems.

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