Unveiling quantum complementarity tradeoffs in relativistic scenarios

Marcos L.W. Basso, Ismael L. Paiva, Pedro R. Dieguez

Research output: Contribution to journalArticlepeer-review


Complementarity plays a pivotal role in understanding a diverse range of quantum phenomena. Here, we show how the tradeoff between quantities of a complete complementarity relation is modified in an arbitrary spacetime for a particle with an internal spin. This effect stems from local Wigner rotations in the spacetime, which couple the spin to the system's external degrees of freedom. To conduct our study, we utilize two generalized delayed-choice interferometers. Despite differences in complementarity tradeoffs inside the interferometers, the interferometric visibility of both setups coincides in any relativistic regime. Our results extend the finding that general relativity induces a universal decoherence effect on quantum superpositions, as local Wigner rotations, being purely kinematical, preclude any spin dynamics. To illustrate, we analyze the Newtonian limit of our results.

Original languageEnglish
Article number062207
JournalPhysical Review A
Issue number6
StatePublished - Jun 2024
Externally publishedYes

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