2016/09/23 by Jennifer R. Glick, Christoph Adami · 1 voice
Computer Science · Physics and Astronomy · #Algorithm #Bell state #Computer science #Computer security #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum entanglement #Quantum mechanics #Quantum teleportation #Sociology #State (computer science) #quant-ph
paper · pdf · doi:10.1103/physreva.95.012105
published as Phys. Rev. A 95, 012105 (2017) · 10 pages, 6 figures
arxiv created 2016/09/23 · arxiv published 2016/09/23 · arxiv updated 2016/09/23 · openalex publication_date 2017/01/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Quantum systems can display particle- or wavelike properties, depending on the type of measurement that is performed on them. The Bell-state quantum eraser is an experiment that brings the duality to the forefront, as a single measurement can retroactively be made to measure particlelike or wavelike properties (or anything in between). Here we develop a unitary information-theoretic description of this and several related quantum measurement situations that sheds light on the trade-off between the quantum and classical features of the measurement. In particular, we show that both the coherence of the quantum state and the classical information obtained from it can be described using only quantum-information-theoretic tools and that those two measures satisfy an equality on account of the chain rule for entropies. The coherence information and the which-path information have simple interpretations in terms of state preparation and state determination and suggest ways to account for the relationship between the classical and the quantum world.