M. W. Mitchell, Cindy I. Hancox, R. Y. Chiao
Temporal and angular correlations in atom-mediated photon-photon scattering are measured. Good agreement is found with the theory presented in Part~I.
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The mediated photon-photon interaction due to the resonant Kerr nonlinearity in an inhomogeneously broadened atomic vapor is considered. The time-scale for photon-photon scattering is computed and found to be determined by the inhomogeneous broadening and the magnitude of the momentum transfer. This time can be shorter than the atomic relaxation time. Effects of atom statistics are included and the special case of small-angle scattering is considered. In the latter case the time-scale of the nonlinear response remains fast, even though the linear response slows as the inverse of the momentum t…
Coupling of electric and magnetic responses of a scatterer known as bianisotropy enables rich physics and unique optical phenomena, including asymmetric absorption or reflection, one-way transparency, and photonic topological phases. Here we demonstrate yet another feature stemming from bianisotropic response, namely, polarization-dependent scattering of light by bianisotropic dielectric meta-atom with broken mirror symmetry, which yields a photonic analogue of spin Hall effect. Based on a simple dipole model, we explain the origin of the effect confirming our conclusions by experimental obser…
Nanoscale control over the second-order photon correlation function $g^{(2)}(τ)$ is critical to emerging research in nonlinear nanophotonics and integrated quantum information science. Here we report on quasiparticle control of photon bunching with $g^{(2)}(0)>45$ in the cathodoluminescence of nanodiamond nitrogen vacancy (NV$^0$) centers excited by a converged electron beam in an aberration-corrected scanning transmission electron microscope. Plasmon-mediated NV$^0$ cathodoluminescence exhibits a 16-fold increase in luminescence intensity correlated with a three fold reduction in photon bunch…
Multi-quantum-channel mediated tunable single-photon skyrmions from metasurfaces
该研究利用超构表面实现偏振纠缠光子对的多通道量子态分布，通过多通道量子测量介导生成可调谐单光子斯格明子，为抗噪高维量子信息处理提供了可行路径。
The photon blockade is a hallmark of quantum light transport through a single two-level system that can accomodate only one photon. Here, we theoretically show that two-photon transmission can be suppressed even for a seemingly classical system with large number of quantum dots in a cavity when the biexciton nonlinearity is taken into account. We reveal the nonmonotonous dependence of the second-order correlation function of the transmitted photons on the biexciton binding energy. The blockade is realized by proper tuning the biexciton resonance that controls the collective superradiant modes.
We predict the existence of a novel interaction-induced spatial localization in a periodic array of qubits coupled to a waveguide. This localization can be described as a quantum analogue of a self-induced optical lattice between two indistinguishable photons, where one photon creates a standing wave that traps the other photon. The localization is caused by the interplay between on-site repulsion due to the photon blockade and the waveguide-mediated long-range coupling between the qubits.
Dynamical photon-photon interaction mediated by a quantum emitter
本研究利用单量子发射器与纳米光子波导的相干耦合实现单光子波包间量子非线性作用，演示双光子调控并揭示其动态响应，为构建复杂光子量子资源态提供新方向。
Flat band mediated photon-photon interactions in 2D waveguide QED networks
该研究通过二维波导量子电动力学网络中的平板带介导光-光相互作用，揭示了发射体集体行为与有效光-光相互作用在高度关联光子态研究中的作用。
We report a photon number resolving detector using two-dimensional electron gas (2DEG) based transistors. When the photon pulses impinge on the absorption region, the generated phonons dissipate ballistically in the 2DEG toward the trench isolated nanowire transistors near the surface. The phonon-electron interaction induces a positive conductance in the transistors, resulting in a current increase. With this principle, we obtain an internal quantum efficiency for this type of detector of up to 85%.
We show that the scattering interaction between a high energy electron and a photon can be strongly enhanced by different types of localized plasmons in a non-trivial way. The scattering interaction is predicted by an eigen-response theory, numerically verified by finite-difference-time-domain simulation, and experimentally verified by cathodoluminescence spectroscopy. We find that the scattering interaction associated with dark plasmons can be as strong as that of bright plasmons. Such a strong interaction may offer new opportunities to improve single-plasmon detection and high-resolution cha…
We show that photons propagating through a Rydberg-dressed atomic ensemble can exchange its spin state with a single atom. Such a spin-exchange collision exhibits both dissipative and coherent features, depending on the interaction strength. For strong interaction, the collision dissipatively drives the system into an entangled dark state of the photon with an atom. In the weak interaction regime, the scattering coherently flips the spin of a single photon in the multi-photon input pulse, demonstrating a generic single-photon subtracting process. An analytic analysis of this process reveals a …
Giant-atom-mediated photon blockade
本文提出巨原子介导的光子阻塞方案，利用巨原子空间扩展性实现多腔同时非传统与传统光子阻塞，并研究点原子系统中的双光子阻塞。
Photon-mediated interactions and dynamics of coherently driven quantum emitters in complex photonic environments
该研究针对嵌入混合光子-等离子体腔的两个相干驱动失谐量子发射器系统，通过与宏观场量子化精确计算对比，评估了Born-Markov主方程模型在结构化色散光子环境中的准确性，发现了四类驱动与分裂区域对应不同的模型精度水平。
Photon Blockade Mediated by Two-Photon Absorption in an Optical Parametric Amplifier
本文通过结合非常规光子阻塞与环境诱导光子阻塞，利用双光子吸收效应，在光学参量放大器中实现更稳定的光子阻塞，增强多光子态抑制能力。
We describe how a structured photonic medium controls the spontaneous emission rate from an excited quantum dot in the presence of electron-phonon coupling. We analyze this problem using a polaron transformed master equation and we consider specific examples of a photonic crystal cavity and a coupled cavity waveguide. We find that when the relaxation times of the photon and phonon baths are comparable, phonons influence spontaneous emission in a non-trivial way. We demonstrate why and how the broadband frequency dependence of the local photon density of states determines the photon emission ra…
We propose a scheme generating robust squeezed light by using double cavity optomechanical system driven by a blue detuned laser in one cavity and by a red detuned laser in the other. This double cavity system is shown to mimic effectively an interaction that is similar to the one for the downconverter, which is known to be a source of strong squeezing for the light fields. There are however distinctions as the phonons, which lead to such an interaction, can contribute to the quantum noise. We show that the squeezing of the output fields in the order of $10$dB can be achieved even at the mirro…
Advancing quantum information, communication and sensing relies on the generation and control of quantum correlations in complementary degrees of freedom. Here, we demonstrate the preparation of electron-photon pair states using the phase-matched interaction of free electrons with the evanescent vacuum field of a photonic-chip-based optical microresonator. Spontaneous inelastic scattering produces intracavity photons coincident with energy-shifted electrons. Harnessing these pairs for correlation-enhanced imaging, we achieve a two-orders of magnitude contrast improvement in cavity-mode mapping…
Photon-mediated interactions near a Dirac photonic crystal slab
本文提出一种半解析理论，用于计算真实光子晶体狄拉克点附近整个晶胞内的偶极光子介导相互作用，揭示了相互作用强度与范围之间的权衡，并发现通过偏振自由度可调控集体相互作用的相干或耗散性质。
Error-Detected Quantum Operations with Neutral Atoms Mediated by an Optical Cavity
提出将光镊中的单原子耦合至法布里-珀罗光纤腔的平台，利用强耦合实现99.960%保真度量子比特读出及两种带错误检测的腔介导纠缠生成方法，推动模块化量子计算与网络发展。
Cavity dark mode mediated by atom array without atomic scattering loss
本文利用结构因子最大化的可配置原子阵列与环形腔强耦合，实现无原子散射损耗的腔暗模，并支持两光学模式高效转换、任意相移调控及单原子寻址。
This article discusses self-organization in cold atoms via light-mediated interactions induced by feedback from a single retro-reflecting mirror. Diffractive dephasing between the pump beam and the spontaneous sidebands selects the lattice period. Spontaneous breaking of the rotational and translational symmetry occur in the 2D plane transverse to the pump. We elucidate how diffractive ripples couple sites on the self-induced atomic lattice. The nonlinear phase shift of the atomic cloud imprinted onto the optical beam is the parameter determining coupling strength. The interaction can be tailo…
Photon-Mediated Hybridization and Dissipative Transport in a Cavity-QED Ring-Acceptor Architecture
研究一个由N位点施主环与中心受体耦合、并由单量子化光子模式驱动的腔QED输运架构中的激发转移，发现近单位效率源于光子介导杂化产生的暗输运通道，并解析了无序和耦合的影响。
Unconventional magnetism mediated by spin-phonon-photon coupling
本研究理论提出自旋-声子-光子耦合可介导双二次长程自旋相互作用，产生非常规一级磁相变，具备超低功耗热辅助写入磁存储和原位磁调控潜力。
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