1997/09/22 by Masahito Ueda, Ueda, Masahito · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Quantum Mechanics and Applications #Quantum Physics (quant-ph) #quant-ph
paper · pdf · doi:10.48550/arxiv.quant-ph/9709045
9pages, LaTex, Invited lecture presented at the Int. Conf. on Frontiers in Quantum Physics (Kuala Lumpur, Malaysia, 9-11 July, 1997) to be published from Springer-Verlag, e-mail: [email protected]
arxiv created 1997/09/22 · openalex publication_date 1997/09/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A quantum measurement is logically reversible if the premeasurement density operator of the measured system can be calculated from the postmeasurement density operator and from the outcome of the measurement. This paper analyzes why many quantum measurements are logically irreversible, shows how to make them logically reversible, and discusses reversing measurement that returns the postmeasurement state to the premeasurement state by another measurement (physical reversibility). Reversing measurement and unitarily reversible quantum operation are compared from the viewpoint of error correction in quantum computation.