Title: Critical-point behavior of a measurement-based quantum heat engine Show Chinese title

Title: 基于测量的量子热机的临界点行为

Abstract: We study how a quantum heat engine performs across the critical value of an external parameter, pertaining to the quantum phase transition. Considering a two-ion system subjected to a magnetic field, we show that the system performs in a quantum Otto cycle above a critical value of the magnetic field, while below such critical point, it does not operate in a heat cycle at all. Moreover, at the critical point, its interaction with an ancillary ion deteriorates the performance of the system as a heat engine. We further show that a strong interaction between the constituent ions of an ion-based system is crucial for it to work in a heat-work cycle, while the coupling to the ancillary system must be minimized. Show Chinese abstract

Abstract: 我们研究了量子热机在外部参数临界值附近的性能，该参数与量子相变有关。 考虑一个受到磁场作用的两个离子系统，我们表明当磁场超过临界值时，系统在量子奥托循环中运行，而在该临界点以下，系统根本无法进行热循环。 此外，在临界点，其与辅助离子的相互作用会降低系统作为热机的性能。 我们进一步表明，基于离子的系统中组成离子之间的强相互作用对于其在热功循环中运行至关重要，而与辅助系统的耦合必须最小化。