Weak Values Influenced by Environment

• 作者: Masashi Ban
• 来源期刊: 现代物理(英文)
• 学科: 医学
• 关键词: WEAK VALUE QUANTUM MEASUREMENT DECOHERENCE
• 年，卷（期）: 2013,（11）
• 页码范围: 1-8
• 页数: 8页
• 分类号: R73

摘要

A weak value of an observable is studied for a quantum system which is placed under the influence of an environment, where a quantum system irreversibly evolves from a pre-selected state to a post-selected state. A general expression for a weak value influenced by an environment is provided. For a Markovian environment, the weak value is calculated in terms of the predictive and retrodictive density matrices, or by means of the quantum regression theorem. For a non-Markovian environment, a weak value is examined by making use of exactly solvable models. It is found that although the anomalous property is significantly suppressed by a Markovian environment, it can survive a non-Markovian environment.