We investigate the Rényi entropy of the excited states produced by the current and its derivatives in the two-dimensional free massless non-compact bosonic theory, which is a two-dimensional conformal field theory. We also study the subsystem Schatten distance between these states. The two-dimensional free massless non-compact bosonic theory is the continuum limit of the finite periodic gapless harmonic chains with the local interactions. We identify the excited states produced by current and its derivatives in the massless bosonic theory as the single-particle excited states in the gapless harmonic chain. We calculate analytically the second Rényi entropy and the second Schatten distance in the massless bosonic theory. We then use the wave functions of the excited states and calculate the second Rényi entropy and the second Schatten distance in the gapless limit of the harmonic chain, which match perfectly with the analytical results in the massless bosonic theory. We verify that in the large momentum limit the single-particle state Rényi entropy takes a universal form. We also show that in the limit of large momenta and large momentum difference the subsystem Schatten distance takes a universal form but it is replaced by a corrected form when the momentum difference is small. Finally we also comment on the mutual Rényi entropy of two disjoint intervals in the excited states of the two-dimensional free non-compact bosonic theory.
Genuine Multi-Entropy of Fully Symmetric Gaussian States
National Center for Theoretical Sciences, National Taiwan University（台湾大学国家理论科学中心）；Department of Physics, National Sun Yat-sen University（国立中山大学物理系）；National Institute of Technology, Yuge College（国立技术研究所育智学院）
Eigenstate Thermalization in 1+1-Dimensional SU(2) Lattice Gauge Theory Coupled with Dynamical Fermions
Indian Institute of Technology - Kanpur（坎普尔印度理工学院）；Max Planck Institute of Quantum Optics（马克斯·普朗克量子光学研究所）；Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）；InQubator for Quantum Simulation (IQuS), Department of Physics, University of Washington（华盛顿大学物理系量子模拟孵化器）；Department of Physics, Birla Institute of Technology and Science Pilani, K K Birla Goa Campus（比拉理工学院皮拉尼分校K.K.比尔拉果阿校区物理系）；Center for Research in Quantum Information and Technology, Birla Institute of Technology and Science Pilani（比拉理工学院皮拉尼分校量子信息技术研究中心）
ISC-CNR, UOS Dipartimento di Fisica, Università “La Sapienza”（国家研究委员会信息系统研究所，罗马大学物理系）；Dipartimento di Fisica e Astronomia, Università di Firenze（佛罗伦萨大学物理与天文学系）；INFN, Sezione di Firenze（意大利国家核物理研究所，佛罗伦萨分部）；QTF Centre of Excellence, Department of Physics, University of Helsinki（赫尔辛基大学物理学院量子技术卓越中心）；Università di Firenze（佛罗伦萨大学）
