Mancino Luca, Sbroscia Marco, Gianani Ilaria, Roccia Emanuele, Barbieri Marco
Dipartimento di Scienze, Università degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy.
Phys Rev Lett. 2017 Mar 31;118(13):130502. doi: 10.1103/PhysRevLett.118.130502. Epub 2017 Mar 27.
Standard thermometry employs the thermalization of a probe with the system of interest. This approach can be extended by incorporating the possibility of using the nonequilibrium states of the probe and the presence of coherence. Here, we illustrate how these concepts apply to the single-qubit thermometer introduced by Jevtic et al. [Phys. Rev. A 91, 012331 (2015)PLRAAN1050-294710.1103/PhysRevA.91.012331] by performing a simulation of the qubit-environment interaction in a linear-optical device. We discuss the role of the coherence and how this affects the usefulness of nonequilibrium conditions. The origin of the observed behavior is traced back to how the coherence affects the propensity to thermalization. We discuss this aspect by considering the availability function.
标准测温法利用探测器与目标系统的热化过程。通过纳入使用探测器非平衡态的可能性以及相干性的存在，这种方法可以得到扩展。在此，我们通过对线光器件中量子比特 - 环境相互作用进行模拟，来说明这些概念如何应用于耶夫蒂奇等人 [《物理评论A》91, 012331 (2015年)PLRAAN1050 - 294710.1103/PhysRevA.91.012331] 提出的单量子比特温度计。我们讨论了相干性的作用以及它如何影响非平衡条件的有用性。观察到的行为的起源可追溯到相干性如何影响热化倾向。我们通过考虑可用性函数来讨论这一方面。
