论文标题
从量子衰变中的单光子的超敏量热检测
Ultrasensitive calorimetric detection of single photons from qubit decay
论文作者
论文摘要
我们描述了一个量子线，直接或通过腔线直接耦合到热浴。本文的主要重点是在逼真的电路中的量热检测上，特别是与电阻器作为吸收器耦合的固态量子标式。模型中的浴室最初是由振荡器组成的，其能量和耦合强度的分布。整个系统的Schrödinger方程的直接数值解决方案，包括浴缸中最高$ 10^6 $的振荡器可验证预期的衰减过程。我们通过添加一个腔体来定量地解决量子和浴室的分离问题，而在该腔之间通过使腔液在其上允许人们将衰减速率调整为方便的检测方式。最重要的是，我们建议将量子分解为两个未耦合的浴缸，并对其温度进行互相关测量。该技术可显着增强量热计的信噪比。
We describe a qubit linearly coupled to a heat bath, either directly or via a cavity. The main focus of the paper is on calorimetric detection in a realistic circuit, specifically a solid-state qubit coupled to a resistor as an absorber. The bath in the model is formed of oscillators initially in the ground state with a distribution of energies and coupling strengths. A direct numerical solution of the Schrödinger equation for the full system including up to $10^6$ oscillators in the bath verifies the expected decay process. We address quantitatively the question of separation of the qubit and bath by adding a cavity in between which by detuning allows one to adjust the decay rate into a convenient regime for detection purposes. Most importantly, we propose splitting a quantum to two uncoupled baths and performing a cross-correlation measurement of their temperatures. This technique enhances significantly the signal-to-noise ratio of the calorimeter.
