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arXiv 0801.1161quant-ph
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不做Schmidt分解的最大纠缠态检测

Detecting maximally entangled states without making the Schmidt decomposition

M. Bhattacharya

摘要:

已知纯量子态的两体纠缠可以用Schmidt分解来表征。特别地,当所有施密特系数相等时,状态是最大纠缠的。我们指出了一个方便的方法,总是产生一个单一的分析条件的状态是最大的纠缠,在任何基础上的扩展系数。即使施密特系数不能解析计算,该方法也有效,并且不需要计算施密特系数。作为一个例子,这种技术被用来推导两个量子比特系统的贝尔基础。在第二个例子中,该技术显示了\textit{never}的特定状态是最大纠缠的,这是使用施密特分解无法达到的一般结论。

英文摘要:

The bipartite entanglement of a pure quantum state is known to be characterized by its Schmidt decomposition. In particular the state is maximally entangled when all the Schmidt coefficients are equal. We point out a convenient method which always yields a single analytical condition for the state to be maximally entangled, in terms of its expansion coefficients in any basis. The method works even when the Schmidt coefficients cannot be calculated analytically, and does not require their calculation. As an example this technique is used to derive the Bell basis for a system of two qubits. In a second example the technique shows a particular state to \textit{never} be maximally entangled, a general conclusion that cannot be reached using the Schmidt decomposition.

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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