2006/10/31 by Francesco Buscemi, Massimiliano F. Sacchi · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Algorithm #Computer science #Disturbance (geology) #Engineering #Geology #Limiting #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum information #Quantum measurement #Quantum mechanics #Quantum optics and atomic interactions #Quantum state #State (computer science) #quant-ph
paper · pdf · doi:10.1103/physreva.74.052320
published as Phys. Rev. A 74, 052320 (2006) · 5 pages, 2 (low-quality) figures. Eq. (20) corrected. Final published version
openalex publication_date 2006/11/14 · arxiv created 2006/11/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
When discriminating between two pure quantum states, there exists a quantitative trade-off between the information retrieved by the measurement and the disturbance caused on the unknown state. We derive the optimal trade-off and provide the corresponding quantum measurement. Such an optimal measurement smoothly interpolates between the two limiting cases of maximal information extraction and no measurement at all.