2012/01/31 by Yukihiro Ota, Sahel Ashhab, Franco Nori
Computer Science · Physics and Astronomy · #Postselection #Protocol (science) #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Separable space #State (computer science) #Weak measurement #quant-ph
paper · pdf · doi:10.1088/1751-8113/45/41/415303
published as J. Phys. A:Math. Theor. 45, 415303 (2012) · 16 pages, 6 figures
openalex publication_date 2012/09/25 · arxiv created 2012/10/16 · arxiv updated 2012/10/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We propose a measurement-based method to produce a maximally-entangled state from a partially-entangled pure state. Our goal can be thought of as entanglement distillation from a single copy of a partially-entangled state. The present approach involves local two-outcome weak measurements. We show that application of these local weak measurements leads to a probabilistic amplification of entanglement. In addition, we examine how the probability to find the maximally-entangled state is related to the entanglement of the input state. We also study the application of our method to a mixed initial state. We show that the protocol is successful if the separable part of the mixed initial state fulfils certain conditions.