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arXiv quant-ph/0610189quant-phmath-phmath.MP
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量子系统中的互补性

Complementarity in quantum systems

Denes Petz

摘要:

将量子系统的状态简化为子系统给出了有关整个系统真实状态的部分量子信息。B(H)的两个子代数A1和A2称为互补的,如果A1和A2的无迹子空间正交(关于Hilbert-Schmidt内积).当两个子代数都是极大阿贝尔时,这个概念就化为互补可观量或互无偏基。本文在一般情况下给出了补子代数的几个刻画,并给出了几个例子。对于一个四能级量子系统,余子代数的结构可以很好地描述,幺正的Cartan分解起着一定的作用。事实证明,对应于贝尔基的测量与双量子比特系统的任何局部测量是互补的。

英文摘要:

Reduction of a state of a quantum system to a subsystem gives partial quantum information about the true state of the total system. Two subalgebras A1 and A2 of B(H) are called complementary if the traceless subspaces of A1 and A2 are orthogonal (with respect to the Hilbert-Schmidt inner product). When both subalgebras are maximal Abelian, then the concept reduces to complementary observables or mutually unbiased bases. In the paper several characterizations of complementary subalgebras are given in the general case and several examples are presented. For a 4-level quantum system, the structure of complementary subalgebras can be described very well, the Cartan decomposition of unitaries plays a role. It turns out that a measurement corresponding to the Bell basis is complementary to any local measurement of the two-qubit-system.

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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