Pont Mathias, Phaneuf-L'Heureux Anne-Laurence, André Régis, Francoeur Sébastien
Engineering Physics , Polytechnique Montréal, Montréal, Québec H3C 3A7, Canada.
Institut NÉEL,Université Grenoble Alpes, CNRS, F-38000 Grenoble, France.
Nano Lett. 2021 Dec 22;21(24):10193-10198. doi: 10.1021/acs.nanolett.1c02898. Epub 2021 Dec 6.
Motional narrowing is a phenomenon by which a quantum state can be entangled with a noisy environment and still retain its intrinsic coherence. Using two optically induced motional forces driving the environmental electrical field amplitude and fluctuations, we present a compelling illustration of the effects of motional narrowing on the energy, line shape, and line width of a single quantum emitter, a Te molecule embedded in ZnSe, subject to spectral diffusion. Motional narrowing is achieved in several regimes, irrespectively of the inhomogeneous disorder initially present and the charge reservoir state sourcing the field. The optimal coherence limit set by the radiative rate can be approached by accelerating spectral diffusion into the THz regime. Motional narrowing applies to any quantum systems for which environmental fluctuations can be deliberately accelerated and alleviates the need for perfected materials and devices.
运动窄化是一种量子态能够与有噪声的环境纠缠但仍保持其固有相干性的现象。利用两种光致运动力驱动环境电场振幅和涨落，我们给出了一个令人信服的例子，展示了运动窄化对嵌入ZnSe中的单个量子发射体（一个Te分子）在受到光谱扩散影响时的能量、线形和线宽的作用。在几种情况下都实现了运动窄化，与最初存在的非均匀无序以及为场提供源的电荷库状态无关。通过将光谱扩散加速到太赫兹 regime，可以接近由辐射率设定的最佳相干极限。运动窄化适用于任何能够有意加速环境涨落的量子系统，并减轻了对完美材料和器件的需求。
