2015/09/30 by Kaifeng Bu, Asutosh Kumar, Lin Zhang +1 · 76 citations
Computer Science · Physics and Astronomy · #Coherence (philosophical gambling strategy) #Law #Open quantum system #Physics #Political science #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum decoherence #Quantum entanglement #Quantum mechanics #Quantum technology #Unitary state #quant-ph
paper · pdf · doi:10.1016/j.physleta.2017.03.022
published in Physics Letters A 381(19), 1670-1676 (Elsevier BV) · 11pages, close to the published version
openalex publication_date 2017/03/22 · arxiv created 2017/04/15 · arxiv updated 2017/04/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Quantum coherence is a basic feature of quantum physics. Combined with tensor product structure of state space, it gives rise to the novel concepts such as entanglement and quantum correlations, which play a crucial role in quantum information processing tasks. However, quantum correlations, especially entanglement, are fragile under decoherence. In this context, very few investigations have touched on the production of quantum coherence by quantum operations. In this paper, we study cohering power -- the ability of quantum operations to produce coherence. First, we provide an operational interpretation of cohering power. Then, we decompose a generic quantum operation into three basic operations, namely, unitary, appending and dismissal operations, and show that the cohering power of any quantum operation is upper bounded by the corresponding unitary operation. Furthermore, we compare cohering power and generalized cohering power of quantum operations for different measures of coherence.