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arXiv quant-ph/9903103quant-ph
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用非冗余期望值表示的量子时间演化

Quantum Time Evolution in Terms of Nonredundant Expectation Values

Stefan Weigert

摘要:

每一种状态重建方案都归结为通过实验中可直接测量的期望值或概率来参数化量子系统的状态。有人认为,这些量的时间演化提供了一个明确的量子动力学的描述。对于单个旋转s,使用不包含冗余信息的期望值的法定数量,显式地显示了这一点。该系统的量子力学时间演化被重新表述为一个耦合(2s+1)^2期望值的一阶线性微分方程的闭集。动力学定律的这种“实现”既不涉及系统的波函数,也不涉及其统计算符。

英文摘要:

Each scheme of state reconstruction comes down to parametrize the state of a quantum system by expectation values or probabilities directly measurable in an experiment. It is argued that the time evolution of these quantities provides an unambiguous description of the quantal dynamics. This is shown explicitly for a single spin s, using a quorum of expectation values which contains no redundant information. The quantum mechanical time evolution of the system is rephrased in terms of a closed set of linear first-order differential equations coupling (2s+1)^2 expectation values. This `realization' of the dynamical law refers neither to the wavefunction of the system nor to its statistical operator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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