We analyze exact ground state (GS) separability in general $N$ particle systems with two-site couplings. General necessary and sufficient conditions for full separability, in the form of one and two-site eigenvalue equations, are first derived. The formalism is then applied to a class of $SU(n)$-type interacting systems, where each constituent has access to $n$ local levels, and where the total number parity of each level is preserved. Explicit factorization conditions for parity-breaking GS's are obtained, which generalize those for $XYZ$ spin systems and correspond to a fundamental GS multilevel parity transition where the lowest $2^{n-1}$ energy levels cross. We also identify a multicritical factorization point with exceptional high degeneracy proportional to $N^{n-1}$, arising when the total occupation number of each level is preserved, in which any uniform product state is an exact GS. Critical entanglement properties (like full range pairwise entanglement) are shown to emerge in the immediate vicinity of factorization. Illustrative examples are provided.
Translation invariance, topology, and protection of criticality in chains of interacting anyons
利用有限尺寸标度变元，可以从有限系统的低能谱中提取相互作用任意子链的临界性质。In Phys. Rev. Lett. 98，160409（2007），Feiguin等人表明，环面上的Fibonacci任意子的反铁磁（AFM）链与三临界伊辛模型处于相同的普适类，并且临界性受到拓扑对称性的保护。在本文中，我们首先回顾了图形形式主义的研究的任意子的光盘，并展示了如何这种形式主义可能会一直延伸到研究系统的表面上的更高的属。然后，我们采用这种图形形式主义研究有限环的相互作用的任意子在光盘和环面，并表明，分析光盘上必然产生的能量谱，这是一个子集，这是获得的环面。对于临界哈密顿量，可以从这个子集中提取出与系统的拓扑对称性有关的局部标度算子的标度维数。相关的考虑也适用于开链。
Singapore University of Technology and Design（新加坡科技设计大学）；National University of Singapore（新加坡国立大学）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong)（粤港澳大湾区量子科学中心（广东））
Collective Quantum Batteries and Charger-Battery Setup in Open Quantum Systems: Impact of Inter-Qubit Interactions, Dissipation, and Quantum Criticality
Indian Institute of Technology Jodhpur（印度技术学院焦特布尔分校）
Critical bifurcation and deconfined quantum criticality in an interacting cluster Ising chain
Indian Institute of Technology Madras（马德拉斯理工学院）；Center for Quantum Information, Communication and Computation (CQuICC)（量子信息、通信与计算中心）；Karlstad University（卡尔斯特德大学）；Heinrich-Heine-Universität（海因里希·海涅大学）；Ilia State University（伊利亚州立大学）；Andronikashvili Institute of Physics（安德罗尼卡什维利物理研究所）；The Abdus Salam International Centre for Theoretical Physics (ICTP)（阿卜杜斯·萨拉姆国际理论物理中心）
