Samyadeb Bhattacharya, Sisir Roy
The dwell time for dissipative quantum system is shown to increase with barrier width. It clearly precludes Hartman effect for dissipative systems. Here calculation has been done for inverted parabolic potential barrier.
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In this letter we prove explicitly that if Hartman effect exists for an arbitrary `unit cell' potential, then it also exist for a periodic system constructed using the same `unit cell' potential repeatedly. We further show that if Hartman effect exists, the tunneling time in the limiting case of a sufficiently thick `unit cell' potential is same as that of its periodic system. This is true for any arbitrary value of the intervening gap between the consecutive `unit cell' of the periodic system. Thus generalized Hartman effect always occurs for a general potential constructed using multiple cop…
A new mathematical model of tunnelling and the Hartman effect puzzle
在本文中，我们开发和完善我们最近的一维完整的散射模型，它给出了一个单独的描述在散射的各个阶段的透射和反射子过程。我们表明，组，驻留和拉莫尔特征时间，在这个模型中引入的子过程，是在一个完全符合狭义相对论，并允许我们解决哈特曼效应之谜。
The celebrated Hartman effect, according to which, the tunneling time through a opaque barrier is independent of the width of the barrier for a sufficiently thick barrier, is not well understood theoretically and experimentally till today. In this work we attempt to through some light to understand the mystery behind this paradoxical result of tunneling .For this purpose we calculate the tunneling time from a layered non-Hermitian system to examine the effect of $PT$-symmetry over tunneling time. We explicitly find that for system respecting $PT$-symmetry, the tunneling time saturates with the…
With reference to a particle tunneling through two successive barriers, it seems to have been generally accepted that the tunneling time does not depend on the separation distance between the barriers. This phenomenon has been called the {\it generalized Hartman effect}. In this letter, we point out a lack of mathematical rigour in the reasoning by which this effect was deduced about ten years ago. A mathematically rigorous treatment shows us that the tunneling time does indeed depend on the length of the free space between the barriers.
The time taken by a wave packet to cross through a finite layered $PT$-symmetric system is calculated by stationary phase method. We consider the $PT$- symmetric system of fix spatial length $L$ consisting of $N$ units of the potential system `$+iV$' and `$-iV$' of equal width `$b$' such that $L=2Nb$. In the limit of large `$b$', the tunneling time is found to be independent of $L$ and therefore the layered $PT$-symmetric system display the Hartman effect. The interesting limit of $N \rightarrow \infty$ such that $L$ remains finite is investigated analytically. In this limit the tunneling time…
Wigner time delay and Hartman effect in quantum motion along deformed Riemannian manifolds
本研究分析变形一维黎曼流形中的弹性量子散射，发现局部曲率变化导致共振态和Wigner时间延迟，低能下与经典时间延迟不符，中高能下两者一致，并探讨了Hartman效应。
Hartman Effect from a Geometrodynamic Extension of Bohmian Mechanics
本文通过几何动力学扩展布雷姆-玻姆力学，揭示量子隧穿与时空几何的联系，解释哈特曼效应的几何自调节机制。
We show that in wavepacket tunnelling localisation of the transmitted particle amounts to a quantum measurement of the delay it experiences in the barrier. With no external degree of freedom involved, the envelope of the wavepacket plays the role of the initial pointer state. Under tunnelling conditions such 'self measurement' is necessarily weak, and the Hartman effect just reflects the general tendency of weak values to diverge, as post-selection in the final state becomes improbable. We also demonstrate that it is a good precision, or 'not really weak' quantum measurement: no matter how wid…
Hartman effect and non-locality in quantum networks
我们研究了臂上具有势垒的各种量子力学网络的相位时间，以发现哈特曼效应的普遍存在。在这样的系统中，可以通过改变空间上与之分离的另一个臂的参数来控制其中一个臂的“超到达”时间，这是另一种量子非局域效应。在某些参数范围内观察到负时滞（时间推进）和具有负饱和时间的“超哈特曼效应”。
Superluminal tunneling times without superluminal signaling: Fading of the MacColl-Hartman effect at early times
本研究指出，尽管MacColl-Hartman效应显示单粒子隧穿具有有效超光速，但利用N个粒子发送一比特信息的平均时间取决于单粒子隧穿时间分布的早期尾部，且该效应在早期会消退，从而排除了超光速信号传输的可能性。
Hartman effect, time-delays, and the non-spatial nature of quantum particles
本文从Hartman效应角度探讨量子隧穿现象，指出量子非局域性是量子非空间性的体现，并强调非空间态在波函数坍缩时进入时空层。
Hartman effect in presence of Aharanov Bohm flux
哈特曼效应的隧道粒子意味着不透明的势垒宽度上的群延迟时间的独立性，与超光速的结果。在Aharonov-Bohm通量的存在下，量子环的几何形状进一步研究这种效果。我们发现，当隧穿通过一个不透明的势垒的群延迟时间为给定的入射能量变得独立的势垒厚度以及磁通量的大小。哈特曼效应，从而扩展到一维以上，并在Aharonov-Bohm通量的存在。
Bounds and enhancements for the Hartman effect
在量子粒子与方形势垒的隧穿碰撞中，透射波包的通过时间在势垒厚度的范围内变得与势垒宽度无关。这就是哈特曼效应，它经常与“超发光”联系在一起。对这种效应的一个基本限制是由非相对论的“因果关系条件”设定的。我们首先证明，因果关系条件施加更多的限制性边界上的负时间延迟（时间推进）时，没有约束状态。这些限制性的界限是在协议与天真的，通常是错误的，因果关系的论点的基础上的积极性的“外推阶段时间”，提出的数量之一，以表征障碍的遍历的持续时间。尽管如此，方井实际上可能比方障带来更大的进步。我们指出，接近阈值的新的束缚态的时间推进大大增加，而在同一时间，传输概率是大的，这有利于可能观察到的增强的时间推进。
I show that the MacColl-Hartman effect, namely, the saturation of the group delay time of sub-barrier quantum tunneling as a function of the barrier width, comes from the saturating behavior of a more fundamental concept - the phase of the stationary wave function. The explanation of saturation is given based on the decomposition of the stationary wave function into the spectrum of wave numbers and formulation of the initial condition for the direction of propagation of the incident matter wave. It is also shown that the saturation plateau of MacColl and Hartman actually doesn't continue indef…
We calculate the time taken by a wave packet to tunnel through a series of complex barrier potentials using stationary phase method to show its saturation (Hartman-Fletcher effect) with number of barriers in various situations. We numerically study the effect of the coupling between the elastic and inelastic channels, width of the individual barrier, separation between the consecutive barriers on the saturation of tunneling time. Nature of HF effect has further been investigated for more realistic barriers with random inelasticity and also for emissive inelastic channels.
The Hartman effect refers to the rather paradoxical result that the time spent by a quantum mechanical particle or a photon to tunnel through an opaque potential barrier becomes independent of barrier width for long barriers. Such an effect, which has been observed in different physical settings, raised a lively debate and some controversies, owing to the correct definition and interpretation of tunneling times and the apparent superluminal transmission. A rather open question is whether (and under which conditions) the Hartman effect persists for inelastic scattering, i.e. when the potential …
We develop a new quantum-mechanical approach to scattering a particle on a one-dimensional (1D) system of two identical rectangular potential barriers, which implies modelling the dynamics of its subprocesses -- transmission and reflection -- at all stages of scattering. On its basis we define, for each subprocess, the dwell time as well as the local (exact) and asymptotic (extrapolated) group times. Our concept of the asymptotic transmission group time confirms the validity of the Wigner phase time in the opaque limit, as well as the existence of the usual and generalized Hartman effects pred…
Phase time for a tunneling particle
我们研究了各种量子力学结构的隧穿相位时间的性质，如网络和环在其手臂上的势垒。我们发现哈特曼效应的普遍存在，超光速的结果，在这些系统。在量子网络中，可以通过改变空间上与之分离的另一个臂上的参数来控制其中一个臂上的“超到达”时间，这是另一种量子非局域效应。在某些参数范围内观察到负时滞（时间推进）和具有负饱和时间的“超哈特曼效应”。在存在和不存在Aharonov-Bohm（AB）通量的情况下，量子环都表现出哈特曼效应。我们得到了饱和相时间的解析表达式。在不透明的障碍制度，这是独立的，甚至AB通量，从而推广哈特曼效应。通过在覆盖环的两个屏障之间引入一个自由空间，我们还简要地讨论了“空间塌陷或空间破坏者”的概念。此外，我们表明，在吸收的存在下，反射相位时间表现出哈特曼效应，在透射相位时间。
More About Tunnelling Times, the Dwell Time, and the ``Hartman Effect"
在最近的综述论文[{ \em Phys. Reports} { \bf 214}（1992）339]中，我们在传统的量子力学中提出了亚势垒隧穿和反射时间的新定义。本文的目的是：（1）介绍和分析各种数值计算的结果（基于我们的方程）在不同穿透深度$x_{\rm f}$下，在隧穿{ \em内部}矩形势垒期间的穿透和返回时间$<τ_{\, \rm Pen}>$、$<τ_{\, \rm Ret}>$;（ii）提出并讨论了除平均值外的{ \em方差}的适当定义（或色散）${\rm D} \, {τ_{\rm T}}$和${\rm D} \, {τ_{\, \rm R}}$，用于传输和反射过程的持续时间;（iii）此外，提到我们对平均传输时间的定义$<τ_{\rm T}>$导致构成普通停留时间${\ove τ}^{\rm Dw}$公式的{ \em改进}：（iv）最后，在我们的{ \em new}数值结果的基础上，对C. R. Leavens最近的一些批评作了评论。\ \我们强调，我们的数值评估{ \em证实}，我们的方法暗示，并暗示，存在{ \em哈特曼效应}：一个效果，在这些天（由于隧道和倏逝波传播之间的理论联系）正在接收-在科隆，伯克利，佛罗伦萨和维也纳--间接的，但相当有趣的，实验验证。最后，简要分析了隧道时间的其它定义。
On Superluminal motions in photon and particle tunnelings
它表明，哈特曼-弗莱彻效应是有效的平均隧穿时间的所有已知的表达式，在各种非相对论的方法，对于有限宽度的障碍没有吸收的情况下。然后，我们表明，同样的效果是无效的隧道时间均方波动。基于哈特曼-弗莱彻效应和光子与非相对论粒子隧穿之间的已知类比，人们可以解释在各种光子隧穿实验中观察到的超光速群速度（而不违反所谓的“爱因斯坦因果关系”）。
We calculate the time taken by a wave packet to travel through a classically forbidden region of space in space fractional quantum mechanics. We obtain the close form expression of tunneling time from a rectangular barrier by stationary phase method. We show that tunneling time depends upon the width $b$ of the barrier for $b \to \infty$ and therefore Hartman effect doesn't exist in space fractional quantum mechanics. Interestingly we found that the tunneling time monotonically reduces with increasing $b$. The tunneling time is smaller in space fractional quantum mechanics as compared to the c…
Relativistic Tunneling Through Two Successive Barriers
研究了Dirac粒子隧穿两个连续静电势垒的相对论量子力学问题。我们的目的是研究所谓的\emph{Generalized Hartman Effect}的出现，在非相对论隧穿的背景下，以及在其电磁对应物中观察到的效果，这往往是与超光速的可能性在隧穿过程中。我们讨论了相位（或群）隧穿时间和驻留时间的行为，并表明在不透明势垒的限制下，相对论理论也允许广义哈特曼效应的出现。我们比较我们的结果与非相对论的，并讨论其解释。
Complementary Quantum Time Distributions from a Single Operational Protocol
本文通过不同的后处理程序，利用自由演化和投影测量构建了基于活动的时间流分布和基于存在的量子斯托克斯分布，为时间提供了互补的操作定义，并应用于隧道效应，展示了不同分布在不同条件下的行为。
Do single photons tunnel faster than light?
在20世纪90年代早期进行的实验产生了一个令人惊讶的结果：单个光子以比真空光速更快的群速度穿过光子隧道势垒。随后的经典脉冲实验也揭示了明显的超光速群速度以及随势垒长度饱和的隧穿时间，这种现象被称为哈特曼效应。在本文中，我们表明，测量的延迟实际上是腔的寿命，而不是渡越时间。这种解释解决了哈特曼悖论，并表明隧道并不像人们普遍认为的那样是超光速的。
Quantal interferometry with dissipative internal motion
在存在耗散的情况下，量子态可以获得复值相位效应。我们提出了一个耗散干涉的概念，容纳这种复值结构，并可能作为一种工具，用于分析某些类型的外部影响量子干涉的效果。将混合态相位和伴随规范不变性的概念推广到耗散内运动。由此产生的复值混合态干涉效应导致众所周知的结果在单一的限制和纯量子态的耗散运动的情况下。将耗散干涉术应用于容错几何量子计算。
Effect of feedback on the control of a two-level dissipative quantum system
我们证明了在二能级耗散量子系统中，通过反馈控制来改变定态是可能的。基于几何控制理论，我们还分析了反馈对Lindblad主方程控制的耗散系统的时间最优控制的影响。这些影响反映在表征最优轨迹的函数$Δ_A(\vec{x})$和$Δ_B(\vec{x})$以及表征时间最优轨迹的切换时间点的切换函数$Φ(t)$和$θ(t),$中。
Dissipative and stochastic effects in the geometric phase of a qubit are taken into account using a geometrical description of the corresponding open--system dynamics within a canonical Langevin framework based on a Caldeira--Leggett like Hamiltonian. By extending the Hopf fibration $S^{3}\to S^{2}$ to include such effects, the exact geometric phase for a dissipative qubit is obtained, whereas numerical calculations are used to include finite temperature effects on it.
Non-Hermitian skin effect and nonreciprocity induced by dissipative couplings
本文提出通过耗散耦合结合多通道干涉实现非厄米趋肤效应，将非厄米性完全转化为非互易型，实现无额外损耗的单向能量传输，为非厄米拓扑效应与定向光学网络设计开辟新途径。
We investigate the quantum Zeno and anti-Zeno effects in quantum dissipative systems by employing a hierarchical equations of motion approach which is beyond the usual Markovian approximation, the rotating wave approximation, and the perturbative approximation. The quantum Zeno and anti-Zeno dynamics of a biased qubit-boson model and a biased qutrit-boson model are provided as illustrative examples. It is found that (i) there exists multiple Zeno-anti-Zeno crossover phenomena, (ii) the non-Markovian characteristic of the bath may be favorable for the accessibility of the Zeno dynamics, and (ii…
Quantum Nonlinear Effect in Dissipatively Coupled Optomechanical System
采用全量子方法研究复合Michelson-Sagnac干涉仪光机械系统，发现耗散耦合引起的非厄米类非线性特性可保护色散耦合的量子本质，使系统在特定参数区域实现强量子非线性与反聚束效应，为实验研究提供新视角。
Synchronization of Hamiltonian motion and dissipative effects in optical lattices: Evidence for a stochastic resonance
从理论上研究了噪声强度对耗散光晶格中布里渊传播模激发的影响。我们表明，激发具有特定数量的噪声对应的精确同步的光学势面上的哈密顿运动和耗散效应与光抽运在晶格中的共振行为。这对应于随机共振现象。我们的结果是通过数值模拟得到的，对应于微观量（原子空间分布）以及宏观量（空间扩散和泵浦-探测光谱的增强）的分析。我们还提出了一个简单的分析模型与模拟非常一致。
The Zeno and anti-Zeno effects on decay in dissipative quantum systems
我们指出，量子芝诺效应，即，通过频繁测量抑制自发衰变，仅在光谱有限的储层中可观察到，即，在空腔和波导中，使用一系列演化中断脉冲或随机调制的CW场。相比之下，这种测量只能加速自由空间中的衰变。
In this paper, we study the effect of classical driving field on the spontaneous emission spectrum of a qubit embedded in a dissipative cavity. Furthermore, we monitor the entanglement dynamics of the driven qubit with its radiative decay under the action of the classical field. Afterwards, we carry out an investigation on the possibility of entanglement swapping between two such distinct driven qubits. The swapping will be feasible with the aid of a Bell state measurement performing on the photons leaving the cavities. It is demonstrated that the classical driving field has a beneficial effec…
We present experimental tests of dissipative extensions of spontaneous wave function collapse models based on a levitated micromagnet with ultralow dissipation. The spherical micromagnet, with radius $R=27$ $μ$m, is levitated by Meissner effect in a lead trap at $4.2$ K and its motion is detected by a SQUID. We perform accurate ringdown measurements on the vertical translational mode with frequency $57$ Hz, and infer the residual damping at vanishing pressure $γ/2π<9$ $μ$Hz. From this upper limit we derive improved bounds on the dissipative versions of the CSL (continuous spontaneous localizat…
Asymptotical formulas for the photon distribution function of a quantum oscillator with time-dependent frequency and damping coefficients, interacting with a thermal reservoir, are derived in the case of a large mean number of quanta. Different regimes of excitation of an initial thermal state with an arbitrary temperature are considered. New formulas are used to predict the statistical properties of the electromagnetic field created in the experiments on the Dynamical Casimir Effect which are now under preparation.
Quantum metrology utilizes quantum effects to reach higher precision measurements of physical quantities compared with their classical counterparts. However the ubiquitous decoherence obstructs its application. Recently, non-Markovian effects are shown to be effective in performing quantum optical metrology under locally dissipative environments\cite{PhysRevLett.123.040402}. However, the mechanism is still rather hazy. Here, we uncover the reason why forming a bound state can protect the quantumness against a dissipative ambient via the quantum Fisher information of entangled coherent states. …
We explore an analogy between the thermodynamics of a free dissipative quantum particle and that of an electromagnetic field between two mirrors of finite conductivity. While a free particle isolated from its environment will effectively be in the high-temperature limit for any nonvanishing temperature, a finite coupling to the environment leads to quantum effects ensuring the correct low-temperature behavior. Even then, it is found that under appropriate circumstances the entropy can be a nonmonotonic function of the temperature. Such a scenario with its specific dependence on the ratio of te…
We consider the dissipative charging process of quantum batteries in terms of a collisional model, where the batteries are coupled to a heat bath using non-energy preserving interactions. First, we show that for low temperatures the collective process can attain a charging power that increases polynomically with the number of batteries. The scaling we find is $N^3$ that, while being grater than the bound obtained for unitary processes, it has a lower efficiency. Then, we study the dissipative charging process of single battery using a time dependent Hamiltonian that generates coherences in the…
Tunneling time in non-Hermitian space fractional quantum mechanics
本研究首次探讨了非厄米空间分数阶量子力学中波包通过复势的隧穿时间，利用稳相法推导出闭式表达式，并揭示了吸收分量与Levy指数的相互作用可引发Hartman效应。
Effective Mass in Dissipative Coupled Polaritons
本研究通过参数分析探讨了耗散和相干耦合共同作用下极子系统中非厄米特效应的产生条件，包括负有效质量、例外点和连续束缚态的形成机制。
The semileptonic decay asymmetry $\mathcal{A}_{Δm}$ is studied within the open quantum systems approach to the physics of the neutral meson $B^0$-$\overline{B^0}$ system: this extended treatment takes into account possible non-standard, dissipative effects induced by the presence of an external environment. A bound on these effects is provided through the analysis of available experimental data from the Belle Collaboration.
Dissipative neutrino oscillations in randomly fluctuating matter
广义动力学描述中微子在随机波动介质中的传播进行了分析：它考虑到物质诱导，退相干现象，超出了标准的MSW效应。一个广泛采用的密度波动模式被发现在物理上是站不住脚的：一个更一般的模型需要考虑，而不是导致味道改变有效的中微子-物质相互作用。它们引起了新的耗散效应，以一种直接实验分析的方式改变了中微子振荡模式。
The recent demonstration of cooling of a macroscopic silicon nitride membrane based on dissipative coupling makes dissipatively coupled optomechanical systems as promising candidates for squeezing. We theoretically show that such a system in a cavity on resonance can yield good squeezing which is comparable to that produced by dispersive coupling. We also report the squeezing resulting from the combined effects of dispersive and dissipative couplings and thus the device can be operated in one regime or the other. We derive the maximal frequency and quadrature angles to observe squeezing for gi…
Quantum dissipative effects for a real scalar field coupled to a dynamical Neumann surface in d+1 dimensions
该研究比较了d+1维中满足Neumann和Dirichlet边界条件的实标量场的量子耗散效应，发现d=1时两者在特定阶数上相等，并给出了d>1时差异的一般表达式。
Phase delay time and superluminal propagation in barrier tunneling
在这项工作中，我们研究的行为维格纳相位延迟时间隧道反射模式。我们的系统由一个圆形回路连接到一个半无限长的单根导线中存在的Aharonov-Bohm通量。我们计算了饱和延迟时间的解析表达式。该饱和延迟时间与Aharonov-Bohm通量和不透明势垒的宽度无关，从而推广了哈特曼效应。这种效应意味着超光速群速度的结果。我们还简要讨论了所谓的“空间塌陷或空间破坏者”的概念。
We study quantum dissipative effects due to the accelerated motion of a single, imperfect, zero-width mirror. It is assumed that the microscopic degrees of freedom on the mirror are confined to it, like in plasma or graphene sheets. Therefore, the mirror is described by a vacuum polarization tensor $Π_{αβ}$ concentrated on a time-dependent surface. Under certain assumptions about the microscopic model for the mirror, we obtain a rather general expression for the Euclidean effective action, a functional of the time-dependent mirror's position, in terms of two invariants that characterize the te…
Effective dissipative dynamics for polarized photons
在开放量子系统的框架下，利用量子动力学半群可以有效地描述偏振光的传播。这些扩展的时间演化引起不可逆性和耗散。在实验室和太空中进行的计划中的高灵敏度实验将能够对这些非标准效应施加严格的限制。
Quantum dissipative effects in moving mirrors: a functional approach
我们使用一个功能的方法来研究移动，平面，色散镜的量子有效动力学的各个方面，耦合到标量或狄拉克场，在不同的维度数。我们首先计算欧几里德有效作用量，并使用它来导出“输入-输出”有效作用量的虚部。对于1+1维的实标量场，我们还得到了Schwinger-Keldysh有效作用量和半经典的Langevin方程，该方程描述了由于与量子场耦合而产生的包括噪声和耗散效应在内的镜面运动.
We study a driven-dissipative Bose-Hubbard model in presence of two-particle losses and an incoherent single-particle drive on each lattice site, leading to a finite-density stationary state. Using dynamical mean-field theory (DMFT) and an impurity solver based on exact diagonalization of the associated Lindbladian, we investigate the regime of strong two-particle losses. Here, a stationary-state quantum Zeno effect emerges, as can be seen in the on-site occupation and spectral function. We show that DMFT captures this effect through its self-consistent bath. We show that, in the deep Zeno reg…
Planck's scale dissipative effects in atom interferometry
原子干涉仪可用于研究导致不可逆性和耗散的现象，这些现象是由大质量尺度的基本物体（弦和膜）的动力学引起的。使用一个有效的，但物理上一致的描述在Lindblad形式的主方程，由新的现象引起的干涉图案的修改进行了详细的分析。我们发现，目前的实验设备可以在原则上提供严格的界限上的新效果。
We discuss the emergence of non-stationarity in open quantum many-body systems. This leads us to the definition of dissipative time crystals which display experimentally observable, persistent, time-periodic oscillations induced by noisy contact with an environment. We use the Loschmidt echo and local observables to indicate the presence of a finite sized dissipative time crystal. Starting from the closed Hubbard model we then provide examples of dissipation mechanisms that yield experimentally observable quantum periodic dynamics and allow analysis of the emergence of finite sized dissipative…
Nonperturbative renormalization-group approach for quantum dissipative systems
用非微扰重整化群方法分析了Caldeira-Leggett模型中的耗散量子隧穿。我们通过引入有效截止点的概念对耗散效应进行分类。我们计算了局域化磁化率来估计量子-经典跃迁的临界耗散。我们的结果与以前的半经典的论点是一致的，但给相当大的临界耗散。
In this paper we study cavity optomechanical systems in which the position of a mechanical oscillator modulates both the resonance frequency (dispersive coupling) and the linewidth (dissipative coupling) of a cavity mode. Using a quantum noise approach we calculate the optical damping and the optically-induced frequency shift. We find that dissipatively coupled systems feature two parameter regions providing amplification and two parameter regions providing cooling. To investigate the strong-coupling regime, we solve the linearized equations of motion exactly and calculate the mechanical and o…
Dissipative decoherence in the Grover algorithm
利用量子轨道方法研究了耗散消相干对Grover量子搜索算法精度的影响。依赖于量子比特的数量和耗散率的确定和测试数值高达16量子比特。数值和解析研究给出了耗散退相干引起的保真度衰减和搜索态几率衰减的普遍规律。该定律与之前量子混沌算法得到的结果一致。
Berry phase effect plays a central role in many mesoscale condensed matter and quantum chemical systems that are naturally under the environmental influence of dissipation. We propose and microscopically derive a prototypical quantum coherent tunneling model around a monopole or conical potential intersection in order to address the intriguing but overlooked interplay between dissipation and topologically nontrivial Berry phase effect. We adopt the instanton approach with both symmetry analysis and accurate numerical solutions that consistently incorporate nonperturbative dissipation and Berry…
Frequency-resolved Purcell effect for the dissipative generation of steady-state entanglement
本研究提出一种驱动-耗散机制，利用腔的频率分辨Purcell效应，在强相互作用量子发射体系综中生成稳态纠缠W态，该机制可在最新固态腔QED系统中观测，为可扩展稳定量子态提供新方向。
Quantum ratchets in dissipative chaotic systems
利用量子轨道方法研究了耗散环境下粒子在脉冲非对称势场中出现的量子混沌耗散棘轮。该系统的特点是从一个量子奇异吸引子中产生定向输运。在有效普朗克常量很小的情况下，该模型表现出从量子态到经典态的转变，符合对应原理。我们还讨论了适用于实现光晶格中冷原子量子棘轮效应的参数值。
Motivated by the search for a quantum analogue of the macroscopic fluctuation theory, we study quantum spin chains dissipatively coupled to quantum noise. The dynamical processes are encoded in quantum stochastic differential equations. They induce dissipative friction on the spin chain currents. We show that, as the friction becomes stronger, the noise induced dissipative effects localize the spin chain states on a slow mode manifold, and we determine the effective stochastic quantum dynamics of these slow modes. We illustrate this approach by studying the quantum stochastic Heisenberg spin c…
Many-Body Non-Hermitian Skin Effect with Exact Steady States in the Dissipative Quantum Link Model
该研究提出了一种具有精确稳态的耗散量子链模型，实现了多体非厄米特皮肤效应，并提出了层次皮肤效应的新类型。
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