大自旋宏观实在论量子破坏的持续性
Persistence of quantum violation of macrorealism for large spins even under coarsening of measurement times
摘要：
本文研究了在测量时间粗化条件下多能级自旋系统宏观实在论的量子破坏，当测量时间具有实验不确定性时。这是一起研究粗化的测量结果的影响，个人的结果不能明确区分。在我们的治疗中，随着不同的测量结果被分成两组，以便对测量结果的粗化进行建模，重要的是，还考虑了测量时间间隔的不同程度的粗化。这表明，虽然对于给定的维度，宏观实在论的量子违反的幅度随着测量时间的粗化程度的增加而减小，有趣的是，这种测量时间粗化的影响可以通过增加自旋系统的维度来取消，从而在大自旋的极限下，宏观实在论的量子违反继续存在。因此，所得到的结果表明，尽管测量时间变粗，但大自旋的经典性并没有从量子力学中出现。
英文摘要：
We investigate quantum violation of macrorealism for multilevel spin systems under the condition of coarsening of measurement times -- i.e., when measurement times have experimental indeterminacy. This is studied together with the effect of coarsening of measurement outcomes for which individual outcomes cannot be unambiguously discriminated. In our treatment, along with different measurement outcomes being clubbed together into two groups in order to model the coarsening of measurement outcomes, importantly, varying degrees of coarsening of measurement time intervals have also been considered. This then reveals that while for a given dimension, the magnitude of quantum violation of macrorealism decreases with the increasing degree of coarsening of measurement times, interestingly, this effect of coarsening of measurement times can be annulled by increasing the dimension of the spin system so that in the limit of large spin, the quantum violation of macrorealism continues to persist. Thus, the result obtained demonstrates that classicality for large spins does not emerge from quantum mechanics in spite of the coarsening of measurement times.
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