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arXiv 1502.07918quant-ph
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用Tsallis熵表示的量子比特连续投影测量的不确定性和确定性关系

Uncertainty and certainty relations for successive projective measurements of a qubit in terms of Tsallis' entropies

Alexey E. Rastegin

摘要:

研究了二维观测量连续两次测量的不确定性和确定性关系。在以下两种情况下考虑连续测量中的不确定性。在第一种情况下,对在第一次测量之后生成的具有完全擦除的信息的量子态执行第二次测量。在第二种情况下,在以实际测量结果为条件的第一测量后状态上执行第二测量。诱导量子不确定性的特征在于通过Tsallis熵。对于一个量子比特的连续两次投影测量,我们得到了诱导不确定度的相关熵测度的最小值和最大值。在第二种情况下发现的一些结论扩展到任意有限维。特别是,相互无偏性的连接被强调。

英文摘要:

We study uncertainty and certainty relations for two successive measurements of two-dimensional observables. Uncertainties in successive measurement are considered within the following two scenarios. In the first scenario, the second measurement is performed on the quantum state generated after the first measurement with completely erased information. In the second scenario, the second measurement is performed on the post-first-measurement state conditioned on the actual measurement outcome. Induced quantum uncertainties are characterized by means of the Tsallis entropies. For two successive projective measurement of a qubit, we obtain minimal and maximal values of related entropic measures of induced uncertainties. Some conclusions found in the second scenario are extended to arbitrary finite dimensionality. In particular, a connection with mutual unbiasedness is emphasized.

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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