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arXiv 0810.4317quant-ph
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相空间中的高斯波包:Fermi g_F函数

Gaussian wave packets in phase space: The Fermi g_F function

Giuliano Benenti, Giuliano Strini

摘要:

任何纯量子态都可以用它的波函数psi(q)或Fermi函数g_F(q,p)等价地表示,其中q,p坐标和系统的共轭动量是系统的坐标,我们证明了高斯波包可以用曲线g_F(q,p)=0方便地在相空间中可视化.然后计算了高斯包自由演化、在常外力或简谐力作用下g_F=0曲线随时间的演化。因此,在相空间中很容易解释数据包的扩展或收缩。最后,我们讨论了一个测量位置-动量关联的格丹肯棱镜显微镜实验。这个gedanken实验,加上著名的海森堡显微镜和冯诺依曼速度计,足以完全确定高斯包的状态。

英文摘要:

Any pure quantum state can be equivalently represented by means of its wave function psi(q) or of the Fermi function g_F(q,p), with q and p coordinates and conjugate momenta of the system under investigation.We show that a Gaussian wave packet can be conveniently visualized in phase space by means of the curve g_F(q,p)=0. The evolution in time of the g_F=0 curve is then computed for a Gaussian packet evolving freely or under a constant or a harmonic force. As a result, the spreading or shrinking of the packet is easily interpreted in phase space. Finally, we discuss a gedanken prism microscope experiment for measuring the position-momentum correlation. This gedanken experiment, together with the well-known Heisenberg microscope and von Neumann velocimeter, is sufficient to fully determine the state of a Gaussian packet.

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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