纠缠对中单个成员的非定域性不可能被另一侧的两个以上无偏观测者共享
Sharing of Nonlocality of a single member of an Entangled Pair Is Not Possible by More Than Two Unbiased Observers on the other wing
摘要:
我们解决了最近提出的一个问题,即一个纠缠的自旋$1/2$粒子对的单个成员的非定域性是否可以在另一个翼上的多个观察者之间共享,这些观察者顺序地并且彼此独立地行动[1]。我们首先表明,在弱或非理想测量的背景下,信息增益和干扰之间的权衡的最优性条件自然出现时,采用一个参数类的正算子值的措施(POVMs)。使用这种形式主义,然后我们证明了分析,这是不可能的,以获得违反Clauser-Horne-Shimony-Holt(CHSH)不等式的两个以上的鲍勃在一个翅膀使用无偏输入设置与爱丽丝在另一个翅膀。
英文摘要:
We address the recently posed question as to whether the nonlocality of a single member of an entangled pair of spin $1/2$ particles can be shared among multiple observers on the other wing who act sequentially and independently of each other [1]. We first show that the optimality condition for the trade-off between information gain and disturbance in the context of weak or non-ideal measurements emerges naturally when one employs a one-parameter class of positive operator valued measures (POVMs). Using this formalism we then prove analytically that it is impossible to obtain violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality by more than two Bobs in one of the two wings using unbiased input settings with an Alice in the other wing.
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