Sharing preparation contextuality in a Bell experiment by an arbitrary pair of sequential observers

Abstract

Based on the quantum violation of bipartite Bell inequality, it has been demonstrated that the sharing of nonlocality can be demonstrated for at most two sequential observers at one end and at most one-pair of observers at both ends. In this work, we study the sharing of non-locality and preparation contextuality based on a bipartite Bell inequality, involving arbitrary n measurements by one party and 2 n−1 measurements by other party. Such a Bell inequality has two bounds, the local bound and the preparation non-contextual bound, which is smaller than the local bound. We show that while non-locality can be shared only by first pair of the sequential observers, the preparation contextuality can be shared by arbitrary pair of independent sequential observers at both ends.