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arXiv 2001.11812quant-phcond-mat.quant-gas
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温度诱导相关性提高低温下的测温精度

Bath-Induced Correlations Enhance Thermometry Precision at Low Temperatures

Guim Planella, Marina F. B. Cenni, Antonio Acin, Mohammad Mehboudi

摘要:

我们研究了冷玻色子浴的温度估计浴诱导的相关性的作用。我们的协议包括多个探针,这些探针不相互作用,它们最初也不相互关联。它们与玻色子样品相互作用并达到非热稳态,测量该稳态以估计样品的温度。众所周知,在稳定状态下,这种不相互作用的探针可能会相互关联,甚至纠缠。然而,这些相关性在计量学中的影响尚未得到深入研究。在这里,我们研究它们的作用,冷玻色子气体的测温,并表明,虽然是经典的,浴引起的相关性可以导致显着提高测温精度。这种改进在低温下尤其重要,因为在低温下实现高精度温度测量是特别苛刻的。所提出的测温方案不需要任何精确的动态控制的探头和调整的参数,是强大的噪声在初始准备,因为它是建立在系统的自然耗散动力学所产生的稳态。因此,我们的研究结果提出了新的可能性,在低温下,相关的,例如,在冷气体和玻色-爱因斯坦凝聚体的测温。

英文摘要:

We study the role of bath-induced correlations in temperature estimation of cold bosonic baths. Our protocol includes multiple probes, that are not interacting, nor are they initially correlated to each other. They interact with a bosonic sample and reach a nonthermal steady state, which is measured to estimate the temperature of the sample. It is well known that in the steady state such noninteracting probes may get correlated to each other and even entangled. Nonetheless, the impact of these correlations in metrology has not been deeply investigated yet. Here, we examine their role for thermometry of cold bosonic gases and show that, although being classical, bath-induced correlations can lead to significant enhancement of precision for thermometry. The improvement is especially important at low temperatures, where attaining high precision thermometry is particularly demanding. The proposed thermometry scheme does not require any precise dynamical control of the probes and tuning the parameters and is robust to noise in initial preparation, as it is built upon the steady state generated by the natural dissipative dynamics of the system. Therefore, our results put forward new possibilities in thermometry at low temperatures, of relevance, for instance, in cold gases and Bose-Einstein condensates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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