Probing Quantum States over Spacetime through Interferometry (opens in new tab)

Author(s): Seok Hyung Lie and Hyukjoon KwonEstablishing a notion of the quantum state that applies consistently across space and time could be a crucial step toward formulating a relativistic quantum theory. We give an operational meaning to multipartite quantum states over arbitrary regions in spacetime through a causally agnostic measureme…[Phys. Rev. Lett. 136, 250201] Published Wed Jun 24, 2026