Once in its non-equilibrium steady state, a nanoscale system coupled to several heat baths may be thought-of as a quantum heat pump. Depending on the direction of its stationary heat flows it may function as e.g. a refrigerator or a heat transformer. These continuous heat devices can be arbitrarily complex multipartite systems, and yet their working principle is always the same: They are made up of several elementary three-level stages operating in parallel. As a result, it is possible to devise external black-box testing strategies to learn about their functionality and performance regardless of any internal details. In particular, one such heat pump can be tested by coupling a two-level spin to one of its contact transitions. The steady state of this external probe contains information about the presence of heat leaks and internal dissipation in the device, and also, about the direction of its steady-state heat currents. Provided that the irreversibility of the heat pump is low, one can further estimate its coefficient of performance. These techniques may find applications in the emerging field of quantum thermal engineering, as they facilitate the diagnosis and design optimization of complex thermodynamic cycles.
热力学第二定律禁止从冷物体到热物体的自发热。然而，理论和实验都表明，如果物体最初是相关的，能量可以从冷物体流向热物体。我们研究了初始纠缠的无耗散量子系统之间的\emph{anomalous energy exchange}。然后，我们扩展了这个模型，包括耗散演示\emph{anomalous heat}从冷到热的机构。基于这些模型，我们构建了一个完全由量子关联驱动的热泵作为燃料，并通过数值模拟研究其性能。利用最近提出的基于互信息的效率定义，发现泵的性能符合热力学第二定律。
Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario（罗萨里奥国立大学精确科学、工程与测量学院）；Instituto de Física Rosario (CONICET)（罗萨里奥物理研究所（CONICET））；Centro Atómico Bariloche（巴里洛切原子中心）；Instituto de Nanociencia y Nanotecnología CONICET-CNEA（CONICET-CNEA纳米科学与纳米技术研究所）；Instituto Balseiro（巴尔塞罗研究所）
Lindbladian approach for many-qubit thermal machines: enhancing the performance with geometric heat pumping by interaction
Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario（罗萨里奥国立大学精确科学、工程与测量学院）；Instituto de Física Rosario (CONICET)（罗萨里奥物理研究所（阿根廷国家科学研究委员会））；Departamento de Sólidos Cuánticos y Sistemas Desordenados, Centro Atómico Bariloche, Instituto de Nanociencia y Nanotecnología CONICET-CNEA and Instituto Balseiro（巴里洛切原子中心量子固体与无序系统系，纳米科学与技术研究所（阿根廷国家科学研究委员会-阿根廷国家原子能委员会）和巴尔塞罗研究所）
Klyshko's Advanced-Wave Picture in Stimulated Parametric Down-Conversion with a Spatially Structured Pump Beam
先进波的图片是“.一个直观的治疗双光子相关的概念的帮助下，一个有效的领域作用于两个探测器之一，并形成了参数转换的先进波发射的第二个探测器.“[A. V. Belinskii和D. N. Klyshko，JETP 78，259（1994）]。Belinskii和Klyshko的这句话很好地描述了先进波图像的概念;这是一个直观的工具，用于设计和预测基于符合的双光子实验的结果。到目前为止，先进的波图片已被认为主要是一个理想的平面波泵浦光束的情况下，仅用于设计目的。在这里，我们研究了先进的波图像的结构泵浦光和背景下的受激发射激发的辅助输入激光束。这表明，受激参量下转换作为一个有用的实验工具，用于测试与先进波图片设计的实验装置。我们目前的实验结果表明，先进的波图片和测试与受激发射的实验设计的策略。
