Effects of measurement dependence on 1-parameter family of Bell tests

Abstract

Most quantum information tasks based on Bell tests rely on the assumption of measurement independence. However, it is difficult to ensure that the assumption of measurement independence is always met in experimental operations, so it is crucial to explore the effects of relaxing this assumption on Bell tests. In this paper, we discuss the effects of relaxing the assumption of measurement independence on 1-parameter family of Bell (1-PFB) tests. For both general and factorizable input distributions, we establish the relationship among measurement dependence, guessing probability, and the maximum value of 1-PFB correlation function that Eve can fake. The deterministic strategy when Eve fakes the maximum value is also given. We compare the unknown information rate of Chain inequality and 1-PFB inequality and find that there exists a parameter range in which it is more difficult for Eve to fake the maximum quantum violation in 1-PFB inequality than in Chain inequality.