3＋1维声子、电子和光子系统的奇异拉氏量描述

基于约束系统的（Ｄｉｒａｃ）理论，用路径积分量子化方法深入分析了光子－电子－声子系统的量子化，说明了与传统研究之间的关系．     

GR的协变量子化与维数正规化计算及发散分析

将时空流形微分同胚当作规范交换，证明其构成群，用Ｆｅｙｎｍａｎ路径积分将引力场ｈ＿μｕ量子化．求得了引力子和虚位子的树图传播子，并计算了虚粒子圈和引力子自能图．同时还得到了Ｓｌａｖｎｏｖ－ｗａｒｄ恒等式，用计算证明了圈图修正满足该恒等式，并将此理论进行了维数正规化．最后将ＧＲ的发散进行分析．     

基于自协调函数的信道容量和最大熵的计算

信道容量和最大熵的计算是信息论中的经典问题.讨论了利用自协调函数理论计算信道容量,尤其是带约束的信道容量的方法.将最大熵的计算作为信道容量计算的特殊情况.作为应用,在证明了单位成本信道容量函数的单峰性的基础上,提出了其相应的多项式时间算法.     

关于一般多路通讯网络系统信道容量区域的正、反编码定理

在[1]中我们得到了一般多路通讯网络系统的编码基本定理与若干信道容量的正、反编码定理,从而对多路通讯网络系统编码的主要特征有所了解。但在[1]中对信道容量的正、反编码定理还没有得到完全统一,因此本文在[1]文的基础上,参考了[3]的若干思想,解决了无记忆信道对一般型网络信道容量的正、反编码定理,从而使这个问     

4—导数引力的量子化及其重整化

该文求得了4-导数引力的场方程，用带导数算子且带权的规范固定计算出了引力子自由与三顶角等树图传播子，用带4动量的引力三项角求出了鬼外线和引力外线二类圈图的发散度．如上作法及结果与已有文献不同．通过对各种圈图发散的分析，指出一些文献用解通常重整化方程的方法得以消除发散的抵消项，是需要进一步研究的．     

离散信道容量的迭代算法

引入信息量偏差概念，给出平均交互信息量关于输入概率的增量公式，设计出离散信道容量线性乘法迭代和线性常系数迭代算法，它们都优于现有的指数迭代算法．并证明在所有单步迭代算法中它们几乎是最好的算法.     

WZW模型和规范场论的辛方法

本文系统讨论Ｗｅｓｓ－Ｚｕｍｉｎｏ－Ｗｉｔｔｅｎ模型，给出了ＷＺＷ模型的辛理论，得到ＷＺＷ模型与Ｃｈｅｒｎ－Ｓｉｍｏｎｓ模型的关系，并且还给出了ＷＺＷ模型几何量子化理论以及圈群的投影表示。本文还研究了三种不同情况下规范场的动量矩映射，通过Ｍａｒｓｄｅｎ－Ｗｅｉｎｓｔｅｉｎ约化，得到Ｇａｕｓｓ约束，还得到Ｋｏｈｎｏ联络，证明了这个联络是平坦的，它的ｈｏｌｏｎｏｍｙ表示则给出了辫群的表示，本文内容散见     

基于非随机信息论的马尔科夫跳变系统可镇定最小信道容量

近年来基于信息论的控制方法已成为控制领域关注的热点,很多学者采用随机变量理论来研究控制中的信息问题,即假设未知量服从一定的概率分布.但在实际的控制系统中,未知量常常是不确定变量,因此基于经典信息论的控制方法存在一定局限.为此文章引入一种非随机信息理论,该理论通过构造信息测度表达式来描述不确定变量之间包含彼此信息量的大小,并建立了信息测度与零误差信道容量之间的关系.基于该理论,利用马尔科夫跳变系统参数构造一个空间集合,根据该空间集合性质得到了信息测度与系统参数的关系,并由此进一步推导出马尔科夫跳变系统可镇定时的零误差信道容量约束.     

Neumann系统的量子化与量子可积性

本文首先讨论了球面上的量子化与从欧氏空间中所诱导的Weyl变换之间的关系,然后通过计算Moyal括号证明了量子Neumann系统是完全可积的。     

量子力学的群论形式与经典量子对应

本文给出量子力学群论形式的数学构造,并讨论与Lie群连带的经典力学系统的几何量子化。我们利用Lie代数到Lie群上的指数映射,建立经典和量子间的对应关系,得出了量子可观察量对易式与对应的经典量Poisson括号间的关系。作为例子,本文讨论了由Heisenberg-Weyl群描述的正则系统。     

Quantum proper entropies and additive capacities of quantum information channels

An elementary algebraic approach to unified quantum information theory is given. The operational meaning of entanglement as specifically quantum encoding is disclosed. General relative entropy as information divergence is introduced, and three most important types of relative information, namely, the Araki-Umegaki type (A-type), the Belavkin-Staszewski type (B-type), and the thermodynamical (C-type) are discussed. It is shown that true quantum entanglement-assisted entropy is greater than semiclassical (von Neumann) quantum entropy, and the proper positive quantum conditional entropy is introduced. The general quantum mutual information via entanglement is defined, and the corresponding types of quantum channel capacities as a supremum via the generalized encodings are formulated. The additivity problem for quantum logarithmic capacities for products of arbitrary quantum channels under appropriate constraints on encodings is discussed. It is proved that true quantum capacity, which is achieved on the standard entanglement as an optimal quantum encoding, retains the additivity property of the logarithmic quantum channel entanglement-assisted capacities on the products of quantum input states. This result for quantum logarithmic information of A-type, which was obtained earlier by the author, is extended to any type of quantum information.     

Channel capacities via p-summing norms

In this paper we show how the metric theory of tensor products developed by Grothendieck perfectly fits in the study of channel capacities, a central topic in Shannon's information theory. Furthermore, in the last years Shannon's theory has been fully generalized to the quantum setting, and revealed qualitatively new phenomena in comparison. In this paper we consider the classical capacity of quantum channels with restricted assisted entanglement. These capacities include the classical capacity and the unlimited entanglement-assisted classical capacity of a quantum channel. Our approach to restricted capacities is based on tools from functional analysis, and in particular the notion of p  -summing maps going back to Grothendieck's work. Pisier's noncommutative vector-valued _Lp$L_p$ spaces allow us to establish the new connection between functional analysis and information theory in the quantum setting.     

Algebraic properties of complex fuzzy events in classical and in quantum information systems

Baer¹-semigroups are regarded as the main abstract structures for an algebraic analysis of complex fuzzy events in generalized probability theory. This assumption is verified in the case of classical probability theory in the framework of measure and integration theory. The corresponding fuzzy language is extended to the non-commutative probability theory based on operators in Hilbert space.Starting from a quantum information system a quantum probability space is constructed, which is naturally embedded in a classical information system. In this last both exact than fuzzy quantum events are represented as classical fuzzy events. Lastly, the classical fuzzy events which correspond to exact quantum events are characterized by some minimality properties.     

The emergence of time

Classically, one could imagine a completely static space, thus without time. As is known, this picture is unconceivable in quantum physics due to vacuum fluctuations. The fundamental difference between the two frameworks is that classical physics is commutative (simultaneous observables) while quantum physics is intrinsically noncommutative (Heisenberg uncertainty relations). In this sense, we may say that time is generated by noncommutativity; if this statement is correct, we should be able to derive time out of a noncommutative space. We know that a von Neumann algebra is a noncommutative space. About 50 years ago the Tomita–Takesaki modular theory revealed an intrinsic evolution associated with any given (faithful, normal) state of a von Neumann algebra, so a noncommutative space is intrinsically dynamical. This evolution is characterised by the Kubo–Martin–Schwinger thermal equilibrium condition in quantum statistical mechanics (Haag, Hugenholtz, Winnink), thus modular time is related to temperature. Indeed, positivity of temperature fixes a quantum-thermodynamical arrow of time. We shall sketch some aspects of our recent work extending the modular evolution to a quantum operation (completely positive map) level and how this gives a mathematically rigorous understanding of entropy bounds in physics and information theory. A key point is the relation with Jones’ index of subfactors. In the last part, we outline further recent entropy computations in relativistic quantum field theory models by operator algebraic methods, that can be read also within classical information theory. The information contained in a classical wave packet is defined by the modular theory of standard subspaces and related to the quantum null energy inequality.     

Conditional Entropy and Information in Quantum Systems

The concepts of conditional entropy of a physical system given the state of another system and of information in a physical system about another one are generalized for quantum systems. The fundamental difference between the classical case and the quantum one is that the entropy and information in quantum systems depend on the choice of measurements performed over the systems. It is shown that some equalities of the classical information theory turn into inequalities for the generalized quantities. Specific quantum phenomena such as EPR pairs and superdense coding are described and explained in terms of the generalized conditional entropy and information.     

Fisher information and kinetic energy functionals: A dequantization approach

We strengthen the connection between information theory and quantum-mechanical systems using a recently developed dequantization procedure whereby quantum fluctuations latent in the quantum momentum are suppressed. The dequantization procedure results in a decomposition of the quantum kinetic energy as the sum of a classical term and a purely quantum term. The purely quantum term, which results from the quantum fluctuations, is essentially identical to the Fisher information. The classical term is complementary to the Fisher information and, in this sense, it plays a role analogous to that of the Shannon entropy. We demonstrate the kinetic energy decomposition for both stationary and nonstationary states and employ it to shed light on the nature of kinetic energy functionals.     

Trumping and Power Majorization

Majorization is a basic concept in matrix theory that has found applications in numerous settings over the past century. Power majorization is a more specialized notion that has been studied in the theory of inequalities. On the other hand, the trumping relation has recently been considered in quantum information, specifically in entanglement theory. We explore the connections between trumping and power majorization. We prove an analogue of Rado’s theorem for power majorization and consider a number of examples.     

Inverse coding theorem for infinite-dimensional quantum channels

In this paper we make a conjecture about the quantum capacity of an infinite-dimensional quantum channel. The proof of the inverse theorem is given based on definitions and properties of the coherent information in the infinite-dimensional case.     

Information and system modelling

In this paper, we first give a clear mathematical definition of information. Then based on this definition of information we consider two routes of system modelling. One route is with stochastic information and the other route is with deterministic information. The route with stochastic information gives the usual information theory where information is carried by random variables or stochastic processes. With this route of stochastic information we can derive quantum mechanics. Then our new feature is the route with deterministic information. We show that with deterministic information we can establish deterministic quantum systems (which are quantum systems with no probability interpretation). From these deterministic quantum systems we can derive the three laws of thermodynamics and resolve the paradox between the second law of thermodynamics and the evolution phenomena of the world. We resolve this paradox by clarifying the relation between Shannon information entropy, Boltzmann entropy and the entropy for the second law. This clarification also solves the negative entropy problem of Schroedinger. These deterministic quantum systems which are established with deterministic information can be regarded as solutions to the the debate between Bohr and Einstein and the measurement problem of quantum mechanics because of their deterministic nature and their quantum structure.     

Topology, Formal Languages and Quantum Information

The paper provides a critical overview of the basic conceptual tools and algorithms of quantum information theory underlying the construction of quantum invariants of links and 3-manifolds as well as of their connections with algorithms and algorithmic complexity questions that arise in geometry and quantum gravity models.