论文标题
Wigner的朋友取决于自相矛盾的量子放大
Wigner's Friend Depends on Self-Contradictory Quantum Amplification
论文作者
论文摘要
在最近的一篇论文中，印库夫斯基和马克维奇（Markiewicz）表明，可以在纯粹逻辑的理由上消除威格纳（Wigner）的朋友（并扩展，施罗丁（Schrödinger）的猫）作为物理可能性。我在一个简单的实验中验证了这一结果并证明了矛盾的来源，在一个简单的实验中，科学家试图测量对象的位置$ | o \ rangle = | a \ rangle_s + | b \ rangle_s $通过使用测量设备进行选择，以便大约| | b \ rangle_s $。我认为该测量是通过量子扩增而不会崩溃而发生的，其中m可以与o纠缠，而s可以在某个非零时间段内可逆。 This assumption implies that during this "reversible" time period, $|A\rangle_M \neq |A\rangle_S$ and $|B\rangle_M \neq |B\rangle_S$ -- i.e., the macroscopic pointer state to which M evolves is uncorrelated to the position of O relative to S. When the scientist finally observes the measuring device, its macroscopic指针状态与位置中的对象无关，$ | a \ rangle_s $或$ | b \ rangle_s $，使“可逆测量”的概念成为逻辑上的矛盾。
In a recent paper, Żukowski and Markiewicz showed that Wigner's Friend (and, by extension, Schrödinger's Cat) can be eliminated as physical possibilities on purely logical grounds. I validate this result and demonstrate the source of the contradiction in a simple experiment in which a scientist S attempts to measure the position of object $|O\rangle = |A\rangle_S + |B\rangle_S$ by using measuring device M chosen so that $|A\rangle_M \approx |A\rangle_S$ and $|B\rangle_M \approx |B\rangle_S$. I assume that the measurement occurs by quantum amplification without collapse, in which M can entangle with O in a way that remains reversible by S for some nonzero time period. This assumption implies that during this "reversible" time period, $|A\rangle_M \neq |A\rangle_S$ and $|B\rangle_M \neq |B\rangle_S$ -- i.e., the macroscopic pointer state to which M evolves is uncorrelated to the position of O relative to S. When the scientist finally observes the measuring device, its macroscopic pointer state is uncorrelated to the object in position $|A\rangle_S$ or $|B\rangle_S$, rendering the notion of "reversible measurement" a logical contradiction.
