We study the fundamental limits of the precision of estimating parameters of a quantum matter system when it is probed by a travelling pulse of quantum light. In particular, we focus on the estimation of the interaction strength between the pulse and a two-level atom, equivalent to the estimation of the dipole moment. Our analysis of single-photon pulses highlights the interplay between the information gained from the absorption of the photon by the atom as measured in absorption spectroscopy, and the perturbation to the temporal mode of the photon due to spontaneous emission. Beyond the single-photon regime, we introduce an approximate model to study more general states of light in the limit of short pulses, where spontaneous emission can be neglected. We also show that for a vast class of entangled biphoton states, quantum entanglement between the signal mode interacting with the atom and the idler mode provides no fundamental advantage and the same precision can be obtained with a separable state. We conclude by studying the estimation of the electric dipole moment of a sodium atom using quantum light. Our work initiates a quantum information theoretic methodology for developing the theory and practice of quantum light spectroscopy.
Pulsed single-photon spectroscopy of an emitter with vibrational coupling
University of Warwick（华威大学）；University of Nottingham（诺丁汉大学）；Università di Napoli Federico II（那不勒斯费德里科二世大学）；Università di Parma（帕尔马大学）；INFN—Sezione di Milano-Bicocca（意大利国家核物理研究所米兰-比科卡分部）
Periodic-Pulse Control of Collective Emission and Photon Statistics in Interacting Quantum Emitters
Middle Tennessee State University（中田纳西州立大学）；Quantum Research, Interdisciplinary Science, and Education (QRISE) Center, Middle Tennessee State University（中田纳西州立大学量子研究、跨学科科学与教育中心）
Ultra-high Resolution Spectroscopy with atomic or molecular Dark Resonances: Exact steady-state lineshapes and asymptotic profiles in the adiabatic pulsed regime
Pulsed excitation of Rydberg-atom-pair states in an ultracold Cs gas
用脉冲激光激发稠密超冷Cs蒸气，研究了Cs原子激发到主量子数在$n=22-36$范围内的$n$ p $_{3/2}$ Rydberg态时的相互作用.观察到对应于里德伯原子对态激发的分子共振，其不仅与$n$ p $_{3/2}+n$ p $_{3/2}$解离渐近线相关，而且与$n$ s $_{1/2}+(n+1)$ s $_{1/2}$、$n$ s $_{1/2}+n'$ f $_{j}$和$(n-4)$ f $_{j}+(n-3)$ f $_{j}$ $(j=5/2,7/2)$解离渐近线相关。这些对共振被解释为所产生的偶极-偶极，和高阶长程相互作用项的基础上的里德伯原子的i）他们的光谱位置，ii）他们的静态和脉冲电场的响应，和iii）毫米波光谱之间的对状态相关的不同对解离渐近线。发现里德伯原子-对态通过Penning电离自发衰变，并且在初始光激发之后的前10个$μ$期间研究电离过程的动力学。为了解释实验观测结果，一个潜在的模型，推导出的基础上的远程相互作用哈密顿量的本征值和本征函数的数值测定。与此潜在的模型，它不包括可调参数，所有的实验观察可以解释，结果表明，长程相互作用模型提供了一个全球性的和准确的描述相互作用在超冷里德堡气体，他们正确的帐户，并使分析，现象的形成不同的里德堡大二聚体，潘宁电离在致密的里德堡气体，和里德伯激发阻断效应。
Vibrational spectroscopy of polar molecules with superradiance
本文研究了在高光学深度（OD）样品中极性分子光谱中振动跃迁的合作现象和超辐射。这种协同性来自于通过偶极-偶极相互作用建立的粒子间相干性，并导致衰变过程的加速。我们将我们的计算与最近的工作进行比较[Deiglmayr等人，EUR. J. D 65，99（2011）]，并且发现非常好的一致性，这表明超辐射效应需要包括在各种各样的超冷分子设置中，包括振动和旋转状态。
