What is the Reduced Density Matrix? | Physics Stack Exchange
网页The reduced matrix is defined as the partial trace of the density matrix. Let $A$ , $B$ be finite dimensional Hilbert spaces, and let there be a $T$ such that $T \in$ $L(A \otimes B)$ (i.e., $T$ is a linear operator on $A \otimes B$ ), then the partial trace of T, represented …
浅入量子计算 - 4.2. 约化密度算子 - 知乎 | 知乎专栏
- 考虑这样一个量子系统，其由两个子系统 A 和 B 构成。其中 A 有 m 个量子位， B 有 n 个量子 …
则 A 系统的约化密度算符 \rho^A = \mathrm{tr}_B[\rho^{AB}] ，同理我们可以得到 B 系统的约化密度算符 \rho^{B} = \mathrm{tr}_A[\rho^{AB}] 。 - 我们来看一些例子：
例 1 ：
- 考虑这样一个量子系统，其由两个子系统 A 和 B 构成。其中 A 有 m 个量子位， B 有 n 个量子 …
Density matrix | Wikipedia
In quantum mechanics, a density matrix (or density operator) is a matrix that describes an ensemble of physical systems as quantum states (even if the ensemble contains only one system). It allows for the calculation of the probabilities of the outcomes of any measurements performed upon the systems of the ensemble using the Born rule. It is a generalization of the more usual state vectors or wavefunctions: while those can only represent pure states, density matrices can …
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网页Density matrices are employed in quantum mechanics to give a partial description of a quantum system, one from which certain details have been omitted. For example, in the …
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网页2016年5月18日 · The previous example was the d = 2 case of this: a 1/2 probability of spin-up and 1/2 probability of spin-down results in the same density matrix, no matter which …
网页the reduced density matrix, i.e. the density matrix of the atom alone. In fact the result of such a calculation gives for the diagonal elements of the density operator, i.e. the state …
网页We introduce the concept of reduced density matrix in the context of open quantum systems. We describe the general structure for operations on density matrices, which …
网页2021年11月9日 · set of two-particle reduced density matrices (2-RDMs). The convex set of 2-RDMs provides a comprehensive map of the quantum system including its distinct …
网页Introduction and Overview of the Reduced Density Matrix Functional Theory. N. N. Lathiotakis. Theoretical and Physical Chemistry Institute, National Hellenic …
Density Matrices | SpringerLink
网页The basic formulas dealing with density matrices in quantum mechanics, with particular emphasis on reduced matrix theory and its applications in atomic physics, have been …
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