We present a possible scheme to tamper with nonlocal quantum correlations in a way that is consistent with relativistic causality, but goes beyond quantum mechanics. A nonlocal ‘‘jamming’’ mechanism, operating within a certain space-time window, would not violate relativistic causality and would not lead to self-contradictory causal loops. The results presented in this paper do not depend on any model of how quantum correlations arise and apply to any jamming mechanism. © 1996 The American Physical Society.

• Received 4 December 1995

DOI:https://doi.org/10.1103/PhysRevA.53.3781