Prediction-Retrodiction Measurements for Teleportation and Conditional State Transfer

Phys Rev Lett. 2023 Aug 11;131(6):060801. doi: 10.1103/PhysRevLett.131.060801.

Abstract

Regular measurements allow predicting the future and retrodicting the past of quantum systems. Time-nonlocal measurements can leave the future and the past uncertain, yet establish a relation between them. We show that continuous time-nonlocal measurements can be used to transfer a quantum state via teleportation or direct transmission. Considering two oscillators probed by traveling fields, we analytically identify strategies for performing the state transfer perfectly across a wide range of linear oscillator-field interactions beyond the pure beam-splitter and two-mode-squeezing types.