论文标题
量子Zeno效应在连续自旋噪声测量下的量子点 - 微骨腔中的连续自旋噪声测量
Quantum Zeno effect under continuous spin noise measurement in a quantum dot-micropillar cavity
论文作者
论文摘要
我们从理论上描述了自旋光子界面中的量子zeno效应，该界面由微骨腔中带电的量子点表示。该系统中的电子自旋与透射光子的极化纠缠在一起，并且它们的连续检测导致外部磁场中电子自旋进液的减慢并诱导自旋松弛。我们获得了自旋测量率的微观表达，并计算自旋噪声的第二和第四阶相关函数，这证明了由于量子Zeno效应而导致的自旋统计的变化。我们证明，可以使用同型非态度自旋测量值来达到任何探针频率的自旋测量的量子极限，从而最大程度地提高了量子信息增益的速率。
We theoretically describe the quantum Zeno effect in a spin-photon interface represented by a charged quantum dot in a micropillar cavity. The electron spin in this system entangles with the polarization of the transmitted photons, and their continuous detection leads to the slowing of the electron spin precession in external magnetic field and induces the spin relaxation. We obtain a microscopic expression for the spin measurement rate and calculate the second and fourth order correlation functions of the spin noise, which evidence the change of the spin statistics due to the quantum Zeno effect. We demonstrate, that the quantum limit for the spin measurement can be reached for any probe frequency using the homodyne nondemolition spin measurement, which maximizes the rate of the quantum information gain.
