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arXiv 2003.13522quant-phcond-mat.mes-hallcond-mat.supr-con
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量子范围内传播微波的初级测温

Primary thermometry of propagating microwaves in the quantum regime

Marco Scigliuzzo, Andreas Bengtsson, Jean-Claude Besse, Andreas Wallraff, Per Delsing, Simone Gasparinetti

摘要:

控制和测量传播微波模式的温度降到非常低的温度的能力对于量子信息处理是必不可少的,并且可能为在纳米尺度上也在量子范围内的热传输的研究打开机会。在这里,我们提出并实验证明主要的测温传播微波使用transmon型超导电路。我们的设备连续工作,灵敏度低至$4\times 10^{-4}$光子/ $\sqrt{\mbox{Hz}}$,带宽为40 MHz。我们测量的热占领的高度衰减的同轴电缆的模式在0.001至0.4热光子的范围内,对应的温度范围从35 mK到210 mK在5 GHz左右的频率。为了以可控的方式提高辐射温度,我们要么注入校准的宽带数字噪声,要么加热器件及其环境。这种测温方案可以在低温微波装置的基准测试和表征、混合量子系统的温度测量和量子热力学中找到应用。

英文摘要:

The ability to control and measure the temperature of propagating microwave modes down to very low temperatures is indispensable for quantum information processing, and may open opportunities for studies of heat transport at the nanoscale, also in the quantum regime. Here we propose and experimentally demonstrate primary thermometry of propagating microwaves using a transmon-type superconducting circuit. Our device operates continuously, with a sensitivity down to $4\times 10^{-4}$ photons/$\sqrt{\mbox{Hz}}$ and a bandwidth of 40 MHz. We measure the thermal occupation of the modes of a highly attenuated coaxial cable in a range of 0.001 to 0.4 thermal photons, corresponding to a temperature range from 35 mK to 210 mK at a frequency around 5 GHz. To increase the radiation temperature in a controlled fashion, we either inject calibrated, wideband digital noise, or heat the device and its environment. This thermometry scheme can find applications in benchmarking and characterization of cryogenic microwave setups, temperature measurements in hybrid quantum systems, and quantum thermodynamics.

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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