Subtleties of witnessing quantum coherence in nonisolated systems
Subtleties of witnessing quantum coherence in nonisolated systems
Identifying non-classicality unambiguously and inexpensively is a long-standing open challenge in physics. The No-Signalling-In-Time protocol was developed as an experimental test for macroscopic realism, and serves as a witness of quantum coherence in isolated quantum systems by comparing the quantum state to its completely dephased counterpart. We show that it …