2016/11/30 by Varad R. Pande, Anil Shaji
Computer Science · Mathematics · Physics and Astronomy · #Algorithm #Artificial intelligence #Bipartite graph #Combinatorics #Computer science #Construct (python library) #Control (management) #Control theory (sociology) #Disturbance (geology) #Fidelity #Function (biology) #Mathematics #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum mechanics #Qubit #State (computer science) #Statistical physics #Telecommunications #Weak measurement #quant-ph
paper · pdf · doi:10.1016/j.physleta.2017.04.036
published as Physics Letters A 381 (2017) 2045-2049 · 5 pages, 3 figures; shown existence and uniqueness of the cost function minimum in v3
arxiv created 2017/04/06 · openalex publication_date 2017/04/28 · arxiv updated 2017/08/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Weak measurements done on a subsystem of a bipartite system having both classical and nonClassical correlations between its components can potentially reveal information about the other subsystem with minimal disturbance to the overall state. We use weak quantum discord and the fidelity between the initial bipartite state and the state after measurement to construct a cost function that accounts for both the amount of information revealed about the other system as well as the disturbance to the overall state. We investigate the behaviour of the cost function for families of two qubit states and show that there is an optimal choice that can be made for the strength of the weak measurement.