频隙介质中的多光子局域化和量子隙孤子的传播

Multiphoton Quantum van Cittert-Zernike Theorem

Recent progress on quantum state engineering has enabled the preparation of quantum photonic systems comprising multiple interacting particles. Interestingly, multiphoton quantum systems can host many complex forms of interference and scattering processes that are essential to perform operations that are intractable on classical systems. Unfortunately, the quantum coherence properties of multiphoton systems degrade upon propagation leading to undesired quantum-to-classical transitions. Furthermore, the manipulation of multiphoton quantum systems requires of nonlinear interactions at the few-ph…

Control of a qubit state by a soliton propagating through a Heisenberg spin chain

We demonstrate that nonlinear magnetic solitary excitations (solitons) traveling through a Heisenberg spin chain may be used as a robust tool capable of coherent control of the qubit's state. The physical problem is described by a Hamiltonian involving the interaction between the soliton and the qubit. We show that under certain conditions the generic Hamiltonian may be mapped on that of a qubit two-level system with matrix elements depending on the soliton parameters. We considered the action of a bright and a dark solitons depending on the driving nonlinear wave function. We considered a loc…

Climbing the Fock ladder: Advancing multiphoton state generation

A scheme for the enhanced generation of higher photon-number states is realized, using an optical time-multiplexing setting that exploits a parametric down-conversion source for an iterative state generation. We use a quantum feedback mechanism for already generated photons to induce self-seeding of the consecutive nonlinear process, enabling us to coherently add photons to the light that propagates in the feedback loop. The addition can be carried out for any chosen number of round trips, resulting in a successive buildup of multiphoton states. Our system is only limited by loop losses. The l…

Generation of time-frequency entangled photon pairs propagating in separate waveguides in circuit QED setup

Time-frequency entangled photons constitute an important resource for a plethora of applications across the diverse quantum technology landscape. Thus, efficient and tunable setups for the generation of entangled photons are requisite for modern quantum technologies. In this work, we propose a generic cavity QED setup designed for on-demand generation of time-frequency entangled photon pairs, with each photon propagating in a separate waveguide. We outline a potential incarnation of this setup in the microwave superconducting circuit QED architecture. We derive and numerically solve the set of…

在非线性波导量子电动力学中生成空间分离的关联多光子态

Generating spatially separated correlated multiphoton states in nonlinear waveguide quantum electrodynamics

针对强关联多光子态确定性生成的挑战，提出基于级联非弹性散射的可扩展架构，利用伪巨原子实现光子数放大级联，生成空间分离的关联多光子态，为量子技术提供按需资源。

通过相互作用产生光子数纠缠孤子对

Generation of photon-number entangled soliton pairs through interactions

提出了两种利用光纤中孤子间的连续相互作用（而不是碰撞）产生宏观（多光子）连续变量纠缠态的新方案。首先，考虑了两个时间分离的单分量时间孤子的量子涨落。当孤子之间有一个合适的初始间距时，在传播一定距离后，光子数起伏之间可以实现几乎完美的相关。在具有两个偏振分量的矢量孤子对中也可以实现光子数相关。在后一种情况下，光子数纠缠的脉冲可以很容易地分离的偏振分束器。这些结果提供了新的可能性，产生纠缠源的量子通信和计算。

确定性地从单原子-腔系统中产生光子数可编程的自由传输Fock态

Deterministic production of free-propagating Fock states of programmable photon number from a single atom-cavity system

我们提出了一种从单模光腔与单原子和激光脉冲相互作用中产生按需泄漏Fock态的机制。光子的数目可以选择，因为它是由原子的基态的塞曼子结构及其初始状态决定的。当圆偏振激光脉冲通过远失谐拉曼散射完全转移基态超精细态$F$的塞曼子能级之间的原子布居数从而产生线偏振腔光子时，实现了$1\leq n\leq2F$光子的自由传播Fock态的确定性产生。我们分析了考虑自发损耗和腔阻尼时光场的演化。我们证明了利用同一原子的不同跃迁产生不同光子数的Fock态的可能性。我们还表明，这种技术提供了一个确定性的来源的训练相同的多光子Fock态，如果一个序列的左，右圆偏振激光脉冲。所得到的态在量子计算和模拟中有潜在的应用。

optical fibers II中的量子噪声：孤子通信中的拉曼抖动

Quantum noise in optical fibers II: Raman jitter in soliton communications

分析了在考虑增益、损耗和热声子拉曼耦合的单模光纤中孤子传输的动力学行为。使用孤子微扰理论和精确的数值技术，我们预测，固有的热量子噪声的声子水库是一个更大的源抖动和其他扰动比增益相关的戈登-豪斯噪声，短脉冲，假设典型的光纤参数。拉曼定时抖动的大小进行评估的亮和暗（拓扑）孤子，并为亮孤子较大。由于拉曼热量子噪声是一种非线性的乘性噪声源，这些效应对于在短脉冲区域中作为孤子传播所需的更强的脉冲更强。因此，拉曼噪声可能会对使用超快（亚皮秒）脉冲的光纤通信和联网造成额外的限制。

Generation of entangled states of light using discrete solitons in waveguide arrays

We study the quantum properties of light propagating through an array of coupled nonlinear waveguides and forming a discrete soliton. We demonstrate that it is possible to use certain types of quasi-solitons to form continuous variables entanglement between the certain pair of waveguides. This entanglement generation process occurs even with a very large number of photons in the laser field used, so it does not require a special material with an extremely high nonlinearity coefficient. Also absorption in the waveguide media does not influence it too much.

传播双光子态中的量子古伊相位奇点

Quantum Gouy phase singularities in a propagating biphoton state

该研究揭示量子古伊相位会在纠缠光子对的纵向传播空间产生非局域相位奇点，明确其拓扑荷、位置及符号的决定因素，确立传播距离为纠缠光子对拓扑结构的坐标空间。

与一维波导强耦合的量子比特的量子拉比振荡

Quantum Rabi oscillations of a qubit strongly coupled to a one-dimensional waveguide

本文研究与一维开放波导强耦合的量子比特的量子拉比振荡，通过旋转波近似对多模杰恩斯-卡明斯哈密顿量精确对角化，分析了多光子过程中拉比振荡的特性。

禁闭势中的量子灰孤子

Quantum gray solitons in confining potentials

我们定义和研究孔状激发（Lieb II模式）在弱相互作用的玻色液体受到外部约束。这些激发是通过灰孤子的半经典量子化获得的，灰孤子在高斯-费米背景上传播。声子辐射的加速灰孤子导致有限的寿命被困Lieb II模式。结果表明，对于大量被困原子，大多数Lieb II能级都可以通过实验分辨。

Many-body dark solitons in one-dimensional hard-core Bose gases

The existence and stability of solitonic states in one-dimensional repulsive Bose-Einstein condensates is investigated within a fully many-body framework by considering the limit of infinite repulsion (Tonks-Girardeau gas). A class of stationary, shape-invariant states propagating at constant velocity are explicitly found and compared to the known solution of the Gross-Pitaevskii equation. The typical features attributed to nonlinearity are thus recovered in a purely linear theory, provided the full many-particle physics is correctly accounted for. However, the formation dynamics predicted by …

光纤引导掺杂谐振介质中控制光孤子的潜在可能性

Hidden possibilities in controlling optical soliton in fiber guided doped resonant medium

已知光纤引导的光信号在掺铒非线性谐振介质中传播产生更清洁的孤子脉冲，其由耦合到非线性薛定谔方程的自诱导透明（SIT）描述。我们发现了两个新的可能性隐藏在其可积结构，放大和控制的光脉冲。利用该模型的可积性所允许的变孤子宽度，可以通过调节初始粒子数反转来调节展宽脉冲。这种效果可以通过其受约束的可积层次的另一种创新应用来增强，提出了多个SIT媒体的系统。这些理论预测在细节上是可行的，修正了一个众所周知的结果的局限性。