Oliver Muelken, Volker Pernice, Alexander Blumen
Long-range interactions slow down the excitation trapping in quantum transport processes on a one-dimensional chain with traps at both ends. This is counter intuitive and in contrast to the corresponding classical processes with long-range interactions, which lead to faster excitation trapping. We give a pertubation theoretical explanation of this effect.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
继续探索
We study the dynamics and trapping of excitations for a dimer with an energy off-set $Δ$ coupled to an external environment. Using a Lindblad quantum master equation approach, we calculate the survival probability $Π(t)$ of the excitation and define different lifetimes $τ_s$ of the excitation, corresponding to the duration of the decay of $Π(t)$ in between two predefined values. We show that it is not possible to always enhance the overall decay to the trap. However, it is possible, even for not too small environmental couplings and for values of $Δ$ of the order ${\cal O}(1)$, to decrease cer…
Coherent population trapping is demonstrated in single nitrogen-vacancy centers in diamond under optical excitation. For sufficient excitation power, the fluorescence intensity drops almost to the background level when the laser modulation frequency matches the 2.88 GHz splitting of the ground states. The results are well described theoretically by a four-level model, allowing the relative transition strengths to be determined for individual centers. The results show that all-optical control of single spins is possible in diamond.
Atomic excitation trapping in dissimilar chirally-coupled atomic arrays
本文理论研究了非相似手性耦合原子阵列界面处的激发动力学，发现通过调节粒子间距和非互易耦合方向性可实现激发反射，并设计了多重区域实现原子激发捕获，为量子寄存器控制提供启发。
Self-trapping of slow electrons in the energy domain
本文研究低能电子与相位匹配光场相互作用，发现电子色散曲率导致能量域强约束，形成可调光谱陷阱，并可将动力学简化为两能态，拓展了电子束物理与量子模拟应用。
A gas of ultracold interacting quantum degenerate Fermions is considered in a three dimensional optical lattice which is externally modulated in the fre- quency and the amplitude. This theoretical study utilizes the Keldysh formalism to account for the system being out of thermodynamical equilibrium. A dynamical mean field theory, extended to non-equilibrium, is presented to calculate characteristic quantities such as the local density of states and the non-equilibrium distribution function. A dynamics Franz-Keldysh splitting is found which accounts for the non-equilibrium modification of the …
Harnessing quantum emitter rings for efficient energy transport and trapping
本文提出利用亚波长间距的量子发射体环形成受保护的集体亚辐射态，以实现对无序和退相干鲁棒的高效光激发吸收、输运与俘获。
Sensing multiatom networks in cavities via photon-induced excitation resonance
本文研究腔中偶极相互作用原子网络共享单光子激发的时空分布，发现光子诱导的激发共振导致部分俘获，并利用该效应实现对多原子网络及其无序的高效精准感知。
An appropriate, time-dependent modification of the trapping potential may be sufficient to create effectively collective excitations in a cold atom Bose-Einstein condensate. The proposed method is complementary to earlier suggestions and should allow the creation of both dark solitons and vortices.
Single-photon cooperative dynamics of an assembly of two-level quantum emitters coupled by a bosonic bath are investigated. The bosonic bath is general and it can be anything as long as the exchange of excitations between quantum emitters and bath is present. In these systems, it is found that the population on the excited emitter keeps a simple and universal trapping law due to the existence of system's dark states. Different from the trapping regime caused by photonemitter dressed states, this type of trapping is only associated with the number of quantum emitters. According to the trapping …
Coherent population trapping at zero magnetic field was observed for nitrogen-vacancy centers in diamond under optical excitation. This was measured as a reduction in photoluminescence when the detuning between two excitation lasers matched the 2.88 GHz crystal-field splitting of the color center ground states. This behavior is highly sensitive to strain, which modifies the excited states, and was unexpected following recent experiments demonstrating optical readout of single nitrogen-vacancy electron spins based on cycling transitions. These results demonstrate for the first time that three-l…
It is shown that by an appropriate modification of the trapping potential one may create collective excitation in cold atom Bose-Einstein condensate. The proposed method is complementary to earlier suggestions. It seems to be feasible experimentally --- it requires only a proper change in time of the potential in atomic traps, as realized in laboratories already.
Position-controlled trapping of nanoparticles and quantum dots on a fiber taper
研究双色光纤锥光阱的三维捕获势，通过控制双模相对功率调节纳米粒子捕获位置，并验证量子点与金纳米粒子共捕获及激发场复用，为量子发射体定位与谐振器耦合调节提供方案。
A novel derivation of quantum propagator of a system described by a general quadratic Lagrangian is presented in the framework of Heisenberg equations of motion. The general corresponding density matrix is obtained for a derived quantum harmonic oscillator and a particle confined in a one dimensional Paul trap. Total mean energy, work and absorbed heat, Wigner function and excitation probabilities are found explicitly. The method presented here is based on the Heisenberg representation of position and momentum operators and can be generalized to a system consisting of a set of linearly interac…
Interference trapping of populations in a semi-infinite coupled-resonator waveguide
研究局域耦合到半无限一维耦合谐振腔阵列的二能级发射体的能级结构与动力学，揭示单激发子空间中的连续能带、离散束缚态及量子相变，并通过长时激发态布居数行为确定束缚态数目。
Vacuum induced coherence in a strongly coupled cavity consisting of a three-level system is studied theoretically. The effects of the strong coupling to electromagnetic field vacuum are examined by solution of an open-system quantum master equation. The numerical results show that the system exhibits population trapping, and the numerical results are interpreted with analytical expressions derived from a new basis in the weak excitation regime. We further show that the generated effects can be probed with weak external fields. Moreover, it is shown that the induced coherence can be controlled …
Multistability and Self-Trapping in Cavity-Magnonic Dimer
研究揭示了腔磁子双极在多稳态和非对称相中的量子特性，通过磁子自陷和量子保真度增强展示了非线性非平衡物理的实验平台。
In this work we study an ultrastrong coupled qubit-cavity system subjected to slow repeated measurements. We demonstrate that even under a few imperfect measurements it is possible to detect transitions of the qubit from its free ground state to the excited state. The excitation probability grows exponentially fast in analogy with the quantum anti-Zeno effect. The dynamics and physics described in this paper is accessible to current superconducting circuit technology.
Effects of finite trapping on the decay, recoil, and decoherence of dark states of quantum emitter arrays
本文研究了有限阱深和光介导力对量子发射体阵列中亚辐射态的影响，发现这些效应会导致衰减率随时间变化、振动能量转移及状态混合，并提出了通过优化阵列配置以减轻退相干的策略。
Incoherent population trapping in quantum emitters
本文提出随机模型推翻辐射概率与内量子效率成正比的假设，揭示亚稳态非相干俘获机制，并提供获取确定性发射体的实验方案。
Atoms excited into high-lying Rydberg states and under strong dipole-dipole interactions exhibit phenomena associated with highly correlated and complex systems. We perform first principles numerical simulations on the dynamics of such systems. The emergence of a roton minimum in the excitation spectrum, as expected in strongly correlated gases and accurately described by Feynman's theory of liquid helium, is shown to significantly inhibit particle transport, with a strong suppression of the diffusion coefficient, due to the emerging spatial order. We also demonstrate how the ability to tempor…
We present a reinterpretation of our previous results on the radial compression mode of a degenerate quantum gas in the BEC-BCS crossover in [1]. We show that our former data are consistent with other experimental and theoretical work, when the ellipticity of the optical trapping potential in [1] is properly taken into account.
扫码添加微信好友，提出您的宝贵建议 👇
💡 备注请填写：网站反馈
发表机构由 AI 从论文文本抽取，如发现错误，欢迎反馈修正建议。