ICFO-Institut de Ciencies Fotoniques, Barcelona Institute of Science and Technology, Castelldefels (Barcelona) 08860, Spain.
Phys Rev Lett. 2018 Jan 26;120(4):040602. doi: 10.1103/PhysRevLett.120.040602.
We discuss the role of contextuality within quantum fluctuation theorems, in the light of a recent no-go result by Perarnau-Llobet et al. We show that any fluctuation theorem reproducing the two-point-measurement scheme for classical states either admits a notion of work quasiprobability or fails to describe protocols exhibiting contextuality. Conversely, we describe a protocol that smoothly interpolates between the two-point-measurement work distribution for projective measurements and Allahverdyan's work quasiprobability for weak measurements, and show that the negativity of the latter is a direct signature of contextuality.
我们讨论了语境在量子涨落定理中的作用，这是基于 Perarnau-Llobet 等人最近的一个反例。我们表明，任何复制经典态两点测量方案的涨落定理，要么承认工作拟概率的概念，要么无法描述表现出语境的协议。相反，我们描述了一个协议，它在两点测量的投影测量的工作分布和 Allahverdyan 的弱测量的工作拟概率之间平滑地插值，并表明后者的负性是语境的直接特征。
