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Physical origins of ruled surfaces on the reduced density matrices geometry
Ji-Yao Chen, Zhengfeng Ji, Zheng-Xin Liu +4
The reduced density matrices (RDMs) of many-body quantum states form a convex set. The boundary of low dimensional projections of this convex set may exhibit nontrivial geometry su…
Geometry of reduced density matrices for symmetry-protected topological phases
Ji-Yao Chen, Zhengfeng Ji, Zheng-Xin Liu +2
In this paper, we study the geometry of reduced density matrices for states with symmetry-protected topological (SPT) order. We observe ruled surface structures on the boundary of…
Topological structures of adiabatic phase for multi-level quantum systems
Zheng-Xin Liu, Xiao-Ting Zhou, Xin Liu +2
The topological properties of adiabatic gauge fields for multi-level (three-level in particular) quantum systems are studied in detail. Similar to the result that the adiabatic gau…
Tightly Localized Stationary Pulses in Multi-Level Atomic System
Xiong-Jun Liu, Xin Liu, Zheng-Xin Liu +2
We show the pulse matching phenomenon can be obtained in the general multi-level system with electromagnetically induced transparency (EIT). For this we find a novel way to create…
Possibility of Inhomogeneous Coupling Leading to Decoherence in an Electromagnetically-Induced-Transparency Quantum-Memory Process
Xiong-Jun Liu, Zheng-Xin Liu, Xin Liu +1
The effect of inhomogeneous coupling between three-level atoms and external light fields is studied in the electromagnetically induced transparency (EIT) quantum memory techqnique.…