Nonclassical Total Probability Formula and Quantum Interference of Probabilities
Alexander Bulinski, Andrei Khrennikov
基于测量过程中随机向量序列变化所描述的随机模型，对量子实验中出现的非经典全概率公式进行了解释.
Interpretation of the nonclassical total probability formula arising in some quantum experiments is provided based on stochastic models described by means of a sequence of random vectors changing in the measurement procedures.
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We present an experiment of nonclassical interference between a pure heralded single-photon state and a weak coherent state. Our experiment is the first to demonstrate that spectrally pure single photons can have high interference visibility, 89.4 \pm 0.5%, with weak coherent photons. Our scheme lays the groundwork for future experiments requiring quantum interference between photons in nonclassical states and those in coherent states.
Observation of Nonclassical Photon Statistics due to Quantum Interference
在一定条件下，在窄带双光子源与相干光场的混合场中观察到了光子反聚束的非经典效应。光子统计中的各种不同的功能被发现是依赖于相对相位的字段的双光子干涉效应的后果。除了反聚束效应，我们发现另一个特征也是非经典的。这些特征强调了量子纠缠的重要性。
We theoretically generate nonclassical states from coherent state heralded by Knill-Laflamme-Milburn (KLM)-type SU(3) interference. Injecting a coherent state in signal mode and two single-photon sources in other two auxiliary modes of SU(3) interferometry, a broad class of useful nonclassical states are obtained in the output signal port after making two single-photon-counting measurements in the two output auxiliary modes. The nonclassical properties, in terms of anti-bunching effect and squeezing effect as well as the negativity of the Wigner function, are studied in detail by adjusting the…
First-order interference of nonclassical light emitted spontaneously at different times
我们研究了由两个在时间上不重叠的泵浦脉冲产生的自发参量下转换中的一阶干涉。所观察到的信号探测器计数率的角分布的调制只能用基于双光子态的量子力学描述来解释。观察干扰的信号通道中的条件示出依赖于空闲辐射的参数。
It is shown that both the visibility ${\cal V} = 1/2$ predicted for two-photon interference experiments with two independent sources\textcolor{black}{, like the Hanbury Brown-Twiss experiment,} and the visibility ${\cal V} = 1$ predicted for two-photon interference experiments with a parametric down-conversion source\textcolor{black}{, like the Ghosh-Mandel experiment,} can be explained \textcolor{black}{by a discrete event simulation. This simulation approach reproduces the statistical distributions of wave theory not by requiring the knowledge of the solution of the wave equation of the whol…
We report measurements of two-photon interference using a cw-pumped type-II spontaneous parametric down-conversion source based on a multimode perodically poled potassium titanyl phosphate waveguide. We have used the recently demonstrated technique of controlling the spatial characteristics of the down-conversion process via intermodal dispersion to generate photon pairs in fundamental transverse modes, thus ensuring their spatial indistinguishability. Good spatial overlap of photon modes within pairs has been verified using the Hong-Ou-Mandel interferometer and the preparation of polarization…
Nonclassical Interference Effects In The Radiation From Coherently Driven Uncorrelated Atoms
我们证明了在连续激光驱动下，两个原子的辐射中存在新的非经典关联。荧光的光子-光子-相关性显示出在经典处理中不存在的空间干涉图案。这种新现象的一个特征是，聚束光和反聚束光在不同的空间方向上发射。计算是用解析法进行的。指出当光子探测不能区分原子时，测量过程中的态约化导致了关联。值得注意的是，即使没有任何原子间的相互作用，这些现象也会出现。
The Berry phase acquired by an electromagnetic field undergoing an adiabatic and cyclic evolution in phase space is a purely quantum-mechanical effect of the field. However, this phase is usually accompanied by a dynamical contribution and cannot be manifested in any light-beam interference experiment because it is independent of the field state. We here show that such a phase can be produced using an atom coupled to a quantized field and driven by a slowly changing classical field, and it is manifested in atomic Ramsey interference oscillations. We also show how this effect may be applied to …
Nonclassical 2-photon interference with separate intrinsically narrowband fibre sources
本文介绍了一种基于光子晶体光纤四波混频的光子对源。仔细设计光纤中的相位匹配条件，使我们能够在597 nm和860 nm处产生光子对，这种光子对处于本质上可分解的状态，没有光谱相关性。这允许预示一个光子处于纯态，因此使窄带滤波过时。该光源是窄带的，明亮的，并实现了高达21%的每光子的整体检测效率。首次提出了来自不同光纤源的未滤波光子的Hong-Ou-Mandel干涉。
Electron interference in mesoscopic devices in the presence of nonclassical electromagnetic fields
研究了介观干涉器件与非经典电磁场的相互作用。外部量子场在电荷上感应出相位因子。这个相位因子是标准Aharonov-Bohm相位因子的推广，在非经典电磁场的情况下是量子力学算符。它的期望值取决于描述非经典光子的密度矩阵，并决定了干涉。讨论了几个例子，表明非经典光子的量子噪声对电子干涉条纹的破坏很小。一个有趣的应用出现在远程电子干涉装置的背景下，用纠缠光子照射。在这种情况下，两个设备中的干扰电子变得纠缠。同样的想法也适用于非经典电磁场辐照的SQUID环。结果表明，通过约瑟夫森结的库珀对隧穿的统计特性依赖于光子的统计特性。
According to Born's rule quantum probabilities are given by the overlap between the system state and measurement states in a quite symmetrical way. This means that both contribute to any observed nonclassical effect that is usually attributed just to the observed light state. This is relevant since typical measurement are highly nonclassical by themselves, such as number states and quadrature eigenstates. We show that nonclassical effects only arise provided that the measurement is itself nonclassical. Otherwise there is a classical-like model accounting for the observed statistics.
Maximum heralding probabilities of nonclassical-state generation from a two-mode Gaussian state via photon-counting measurements
本文研究了通过光子计数测量从双模高斯态生成非经典态的最大 heralding 概率，并展示了其与检测光子数的依赖关系，证明了实验所需次数仅与光子数呈多项式关系。
A corpuscular simulation model for second-order intensity interference phenomena is discussed. It is shown that both the visibility ${\cal V}=1/2$ predicted for two-photon interference experiments with two independent sources and the visibility ${\cal V}=1$ predicted for two-photon interference experiments with a parametric down-conversion source can be explained in terms of a locally causal, modular, adaptive, corpuscular, classical (non-Hamiltonian) dynamical system. Hence, there is no need to invoke quantum theory to explain the so-called nonclassical effects in the interference of signal a…
From the Hong-Ou-Mandel Effect to Quantum Sensing: Interference of Nonclassical Light with Partial Distinguishability and Noise
论文利用相空间形式论等方法，研究噪声线性干涉仪中光的非经典态干涉，用于量子信息与传感。发现多光子Fock态新零概率事件，扩展高斯玻色子采样描述，探讨与量子多参数估计联系，揭示测量不相容性是基本限制。
Superposition principle of wave function in multi-slit interference experiment has been widely accepted by many quantum mechanics textbooks, however the expression ${ψ_{AB}} = {ψ_A} + {ψ_B}$ does not strictly hold. The non-classical paths in Feynman path integral provide an explanation to the multi-path interference effect, and can be used to quantitatively analyse the multi-slit interference effect. In this work, we apply quantities in Bohmian mechanics to the measurement of multi-order interference by analysing the contribution of non-classical paths to Bohmian velocity in electron's multi-s…
The interference of the nonclassical light pulse with a coherent one and the sub-Poissonian statistics formation
利用光学分束器的理论模型，研究了自相位调制超短光脉冲（SPM USP）与相干光脉冲的干涉。研究发现，选择分束器的透射系数，可以得到我们感兴趣的正交涨落谱。结果表明，几何相位的选择给出了一个控制的位置的椭圆压缩在正交空间XY。引入了扩展的Mandel参数，并在所有频率下扫描了光子统计。它是建立的子和超泊松统计形成可以通过选择脉冲之间的非线性相位添加和初始线性相移。自相位调制（SPM）导致分束器输出端总光子数的附加调制。
Many-Body Amplified Nonclassical Photon Emission in Cavity-Coupled Atomic Arrays
研究通过腔体介导的多体自旋交换相互作用，利用干涉机制重塑 dressed-state 曼陀林，实现高纯度单光子发射与双光子对的可控生成，展示了可扩展的量子光源生成方法。
We develop a technique for generating multi-photon nonclassical states via interference between coherent and Fock states using quantum catalysis. By modulating the coherent field strength, the number of catalyst photons and the ratio of the beam splitter upon which they interfere, a wide range of nonclassical phenomena can be created, including squeezing of up to 1.25 dB, anti- and super-bunched photon statistics and states exhibiting over 90% fidelity to displaced coherent superposition states. We perform quantum catalysis experimentally, showing tunability into the nonclassical regime. Our p…
Aspects of the phenomenology of interference that are genuinely nonclassical
本文证明基本量子波粒二象性关系无法由任何非语境本体论模型复现，并据此指出可通过干涉实验展示语境性。
We investigate quantum correlations in microwave radiation produced by the dynamical Casimir effect in a superconducting waveguide terminated and modulated by a superconducting quantum interference device. We apply nonclassicality tests and evaluate the entanglement for the predicted field states. For realistic circuit parameters, including thermal background noise, the results indicate that the produced radiation can be strictly nonclassical and can have a measurable amount of intermode entanglement. If measured experimentally, these nonclassicalilty indicators could give further evidence of …
The quasiprobability representation of quantum states addresses two main concerns, the identification of nonclassical features and the decomposition of the density operator. While the former aspect is a main focus of current research, the latter decomposition property has been studied less frequently. In this contribution, we introduce a method for the generalized expansion of quantum states in terms of so-called quasistates. In contrast to the quasiprobability decomposition through nonclassical distributions and pure-state operators, our technique results in classical probabilities and nonpos…
Nonclassical correlations in damped quantum solitons
利用高斯近似下的累积量展开，数值研究了克尔介质中阻尼类孤子脉冲的内量子统计特性，包括窄谱脉冲分量和有限谱脉冲分量。结果表明，在一定条件下，吸收可以增强亚泊松统计，从而抑制某些相消干涉。此外，它示出的光子数相关性和相关的光子数方差之间的不同的脉冲分量可以是高度非经典的，即使是吸收光纤。确定了最佳的频率窗口，以实现强非经典行为，这提供了新的可能性，使用光纤中的孤子作为非经典相关光束的源。
This paper establishes a direct, robust and intimate connection between (i) non classicality tests for various quantum features, e.g., non-Boolean logic, quantum coherence, nonlocality, quantum entanglement, quantum discord; (ii) negative probability, and (iii) anomalous weak values. It has been shown [Adhikary et al. Eur. Phys. J. D, 74(68):68, 2020] that nonexistence of a classical joint probability scheme gives rise to sufficiency conditions for nonlocality, a nonclassical feature not restricted to quantum mechanics. The conditions for nonclassical features of quantum mechanics are obtained…
Experimental observation of nonclassical effects on single-photon detection rates
人们经常断言，量子效应可以在符合探测率或其他相关性中观察到，但从来没有在单光子探测率中观察到。由于光子计数器的固有非线性，我们观察到非经典干涉的单速率。这是由于有效检测效率依赖于光束的量子统计。探测器对光子对响应的这种测量有望揭示硅光电探测器的微观方面，以及量子测量和退相干的一般问题。
Quantum interference in the resonance fluorescence of a $J=1/2$-$J'=1/2$ atomic system: Quantum beats, nonclassicality, and non-Gaussianity
本文研究J=1/2-J'=1/2原子系统在激光驱动下由π跃迁量子干涉产生的共振荧光，揭示量子拍、非经典性与非高斯性，并分析其光谱和关联特征。
We observe at record-high speed the nonclassical nature of ultra-broadband bi-photons, reducing the measurement time by four orders of magnitude compared to standard techniques of Hong-Ou-Mandel interference or sum-frequency generation. We measure the quantum state of the broadband bi-photons, amplitude and phase, with a pairwise "Mach-Zehnder" quantum interferometer, where bi-photons that are generated in one nonlinear crystal are enhanced (constructive interference) or diminished (destructive interference) in another crystal, depending on the bi-photon phase. We verify the quantum nature of …
Bunching of Photons When Two Beams Pass Through a a Beam Splitter
狄拉克写道：“每个光子只与自己发生干涉。两个不同光子之间的干涉永远不会发生。实际上，一个实际的定义是，“经典”光学由光子只与自身干涉的现象组成。然而，光子服从玻色统计，这意味着它们有“非经典”的“聚束”趋势。对于非经典光学行为的一个简单的例子，我们考虑两个脉冲的光子的一个单一的频率，同时入射到两侧的无损，50：50分束器。
We study an optomechanical system for the purpose of generating a nonclassical mechanical state when a mechanical oscillator is quadratically coupled to a single-mode cavity field driven by a squeezed optical field. The system corresponds to a regime where the optical dissipation dominates both the mechanical damping and the optomechanical coupling. We identify that multi-phonon processes emerge in the optomechanical system and show that a mechanical oscillator prepared in the ground state will evolve into an amplitude-squared squeezed vacuum state. The Wigner distribution of the steady state …
Interference lies at the heart of the behavior of classical and quantum light. It is thus crucial to understand the boundaries between which interference patterns can be explained by a classical electromagnetic description of light and which, on the other hand, can only be understood with a proper quantum mechanical approach. While the case of two-mode interference has received a lot of attention, the multimode case has not yet been fully explored. Here we study a general scenario of intensity interferometry: we derive a bound on the average correlations between pairs of output intensities for…
Robust Nonclassical magnon pair generation and Cauchy-Schwarz inequality violation in a hybrid electromagnonic system
该研究在混合电磁子系统中，利用驱动相位补偿耦合不对称性，实现鲁棒非经典磁振子对产生与柯西-施瓦茨不等式违反，为相位可控的磁振子量子信息处理提供支持。
We perform a phase-space analysis of strong-field enhanced ionisation in molecules, with emphasis on quantum-interference effects. Using Wigner quasi-probability distributions and the quantum Liouville equation, we show that the momentum gates reported in a previous publication [N. Takemoto and A. Becker, Phys. Rev. A \textbf{84}, 023401 (2011)] may occur for static driving fields, and even for no external field at all. Their primary cause is an interference-induced bridging mechanism that occurs if both wells in the molecule are populated. In the phase-space regions for which quantum bridges …
This Chapter develops a realist information-theoretic interpretation of the nonclassical features of quantum probabilities. On this view, what is fundamental in the transition from classical to quantum physics is the recognition that \emph{information in the physical sense has new structural features}, just as the transition from classical to relativistic physics rests on the recognition that space-time is structurally different than we thought. Hilbert space, the event space of quantum systems, is interpreted as a kinematic (i.e., pre-dynamic) framework for an indeterministic physics, in the …
Interference of probabilities and number field structure of quantum models
我们研究了量子形式主义中基本数域选择的概率后果。我们证明，通过选择量子模型的线性空间表示的数域，可以描述各种干涉现象。我们分析干扰的概率替代品引起的真实的，复杂的，双曲（克利福德）和p-adic表示。
Revealing inherent quantum interference and entanglement of a Dirac particle
本研究揭示了狄拉克粒子相空间中超越Zitterbewegung的固有干涉图样，其非经典性由准概率负性和赝自旋-动量纠缠体现，并通过超导量子比特实验验证，对量子技术有应用价值。
We investigate the consistency of conditional quantum probabilities. This is whether there is compatibility between the Kolmogorov-Bayes conditional probabilities and the Born rule. We show that they are not compatible in the sense that there are situations where there is no legitimate density matrix that may reproduce the conditional statistics of the other observable via the Born rule. This is to say that the Gleason theorem does not apply to conditional probabilities. Moreover, we show that when this occurs the joint statistics is nonclassical. We show that conditional probabilities are not…
We develop a nonclassicality criterion for the interference of three delayed, but otherwise identical, light fields in a three-mode Bell interferometer. We do so by comparing the prediction of quantum mechanics with those of a classical framework in which independent sources emit electric fields with random phases. In particular, we evaluate third-order correlations among output intensities as a function of the delays, and show how the presence of a correlation revival for small delays cannot be explained by the classical model of light. The observation of a revival is thus a nonclassicality s…
`Quantum probabilities' as context depending probabilities
我们研究由上下文转变引起的传统（“经典”）概率的变换。它表明，从一个复杂的条件过渡到另一个诱导扰动的经典规则的概率替代品。我们对这种扰动进行分类。结果表明，有两类扰动：（a）三角干涉;（b）双曲干涉。特别是，可以在经典（但上下文）概率框架中获得众所周知的“概率选择的量子干涉”。因此，我们不需要应用波的论点（或考虑叠加原理）来得到量子统计。特别是，干扰可能是纯微粒物体实验的一个特征。
Nonclassical state is an essential resource for quantum-enhanced communication, computing and metrology to outperform their classical counterpart. The nonclassical states that can operate at high bandwidth and room temperature while being compatible with quantum memory are highly desirable to enable the scalability of quantum technologies. Here, we present a direct observation of broadband nonclasscal states in a room-temperature light-matter interface, where the atoms can also be controlled to store and interfere with photons. With a single coupling pulse and far off-resonance configuration, …
Single photons and single-photon pairs, inherently nonclassical in their nature, are fundamental elements of quantum sciences and technologies. Here, we propose to realize the nonclassical correlated deterministic photon pairs at the single-photon level for a single atom trapped in bimodal cavities. It is shown that the photon emissions for bimodal cavities exhibit a high single photon purity and relatively large intracavity photon numbers, which are ascribed to the combination of optical Stark shift enhanced energy-spectrum anharmonicity and quantum interference suppressed two-photon excitati…
EPR-Bohm experiment, interference of probabilities, imprecision of time
我们证明，EPR玻姆概率可以很容易地获得在经典的（但上下文）的概率框架，通过使用概率的干扰公式。从这个角度来看，EPR-贝尔实验只是一个概率干涉的实验。我们分析了EPR-玻姆实验中语境的时间结构。结论是，量子力学并不矛盾的一个本地现实的模型，其中概率计算为平均的条件/测量对的实例的时间$t_1< t_2.$。如果我们限制我们的考虑只同时测量在固定的实例的时间$t$，我们会得到矛盾的贝尔定理。这一事实的一个含义可能是不可能在上下文微观现实模型的水平上定义{具有绝对精度的\it时间}的实例。
Nonclassical Imaging for a quantum search of trapped ions
我们讨论了一个简单的搜索问题，可以追求不同的方法，无论是在经典的或量子的基础上。该系统是由一个链的捕获离子。要搜索的离子是该链的一员，然而，由不同于其他的同位素种类组成。结果表明，经典成像可以像量子成像一样快速地得到最终结果。然而，对于所讨论的情况下，量子方法给出了更多的灵活性和更高的精度时，考虑在链中的离子的数量增加。此外，即使当离子之间的距离小于入射光的波长的一半时，也可观察到干涉。
Conventional Glauber coherent states (CS) can be defined in several equivalent ways, e.g., by displacing the vacuum or, explicitly, by their infinite Poissonian expansion in Fock states. It is well known that these definitions become inequivalent if applied to finite $d$-level systems (qudits). We present a comparative Wigner-function description of the qudit CS defined (i) by the action of the truncated displacement operator on the vacuum and (ii) by the Poissonian expansion in Fock states of the Glauber CS truncated at $(d-1)$-photon Fock state. These states can be generated from a classical…
Efficient construction of witnesses of stellar rank of nonclassical states of light
提出一种高效构造光量子态恒星秩见证的方法，其所需优化的参数数量不依赖恒星秩且随模式数二次标度，并基于Fock态概率对和相干态叠加保真度对验证了该方法。
Quantum coherence from Kirkwood-Dirac nonclassicality, some bounds, and operational interpretation
本研究基于KD准概率的非实性与负性构建量子相干性量化指标，推导其上下界、纯态闭式表达式及非对易基下的权衡关系，提出基于弱值测量的估计方案并探讨与量子互文性的关联。
Tomogram-based quantifiers of nonclassicality dynamics in Kerr and cubic media
本文提出基于汤姆逊图的非经典性量化方法，用于研究 Kerr 和立方介质中非经典性动态，通过平衡光探测直接获取光学汤姆逊图，避免密度矩阵重建，提供实验可行的非经典性度量。
A quantum theory of light propagation in two optical channel waveguides tunnelling-coupled to a common continuum of modes (such as those of a slab waveguide) is presented, and classical and quantum interference effects are investigated. For classical light, the photonic system realizes an optical analogue of coherent population trapping in the continuum encountered in atomic physics, where destructive interference between different light leakage channels leads to the appearance of a trapped state embedded in the continuum. For nonclassical light, two-photon interference effects are predicted, …
Quantum probabilities differ from classical ones in many ways, e.g., by violating the well-known Bell and CHSH inequalities or another simple inequality due to R. Wright. The latter one has recently regained attention because of its equivalence to a novel noncontextual inequality by Klyachko et al. On the other hand, quantum probabilities still obey many limitations which need not hold any more in more general probabilistic theories (super quantum probabilities). Wright, Popescu and Rohrlich identified states which are included in such theories, but impossible in quantum mechanics, and they sh…
Complementarity theory is the essence of the Copenhagen interpretation. Since the Hanbury Brown and Twiss experiments, the particle nature of photons has been intensively studied for various quantum phenomena such as anticorrelation and Bell inequality violation in terms of two-photon correlation. Regarding the fundamental question on these quantum features, however, no clear answer exists for how to generate such an entanglement photon pair and what causes the maximum correlation between them. Here, we experimentally demonstrate the physics of anticorrelation on a beam splitter using sub-Pois…
Spatial overlap of nonclassical ultrashort light pulses and formation of polarization-squeezed light
研究了电子克尔介质中自相位调制效应产生的非经典超短光脉冲的空间重叠性及其与光的偏振压缩态形成的关系。用四个量子斯托克斯参量来处理光的偏振态，研究了它们的量子涨落谱。我们表明，在该频率处的斯托克斯参数的量子涨落的抑制是最大的，可以通过调整脉冲之间的线性相位差来控制。通过改变单脉冲的强度，可以有效地抑制斯托克斯参量的量子涨落。我们研究了各向异性电子克尔介质中非经典脉冲的叠加，证明了交叉相位调制效应可以用来控制光的偏振压缩态。此外，我们建立了一个脉冲的强度或非线性相移的变化有效地控制了斯托克斯参数的压缩。分析了相干脉冲场与两个正交压缩脉冲在分束器上混频产生的干涉脉冲的空间重叠。结果表明，四个斯托克斯参量中有三个参量产生压缩，前两个参量的压缩是同时发生的。
Interference versus success probability in quantum algorithms with imperfections
我们研究了Shor的因子分解算法和Grover的搜索算法的性能上的错误和消相干的影响，并在这些算法中使用最近提出的干扰措施的干扰量。我们考虑系统酉误差，随机酉误差，和退相干过程。我们表明，酉错误破坏的干扰破坏算法的效率，太。然而，酉误差也可能产生无用的附加干扰。在这种情况下，干扰的总量会增加，而量子计算的效率会降低。对于由于相位翻转误差引起的去相干，对于小的误差概率，干扰被破坏，并且对于接近1的误差概率，干扰被转换为相消干涉，导致成功概率甚至可以下降到低于经典值。我们的研究结果表明，在一般情况下，干扰是必要的，以使量子算法优于经典计算，但大量的干扰是不够的，甚至可能导致相消干涉比经典的成功率更差。
Bell's inequality for conditional probabilities as a test for quantum-like behaviour of mind
我们将量子类概率行为定义为不可能用经典概率模型描述的行为。我们讨论的猜想，认知行为是量子。提出了一种基于著名的贝尔不等式的推广的量子认知行为的实验测试方案。这个推广是贝尔不等式的一个类似物，但对于条件概率。条件概率的使用（而不是原来贝尔不等式中的观测值对的同时概率分布）使分离原来贝尔框架中混合的两个问题成为可能：非局部性和非经典（类量子）概率行为。我们的条件概率不等式可以用于单个系统的实验（因此我们不需要准备成对的相关系统），以发现量子类行为。这种可能性在认知科学中是极其重要的，因为在认知科学中，几乎不可能准备成对的精确相关的认知系统。
Born rule is key to understanding quantum mechanics based on the probability amplitude for the measurement process of a physical quantity. Based on a typical particle nature of a photon, the quantum feature of photon bunching on a beam splitter between two output photons can be explained by Born rule even without clear definition of the relative phase between two input photons. Unlike conventional understanding on this matter, known as the Hong-Ou-Mandel effect, here, we present a new interpretation based on the wave nature of a photon, where the quantum feature of photon bunching is explained…
Quantum networks require interfacing stationary and flying qubits. These flying qubits are usually nonclassical states of light. Here we consider two of the leading source technologies for nonclassical light, spontaneous parametric down-conversion and single semiconductor quantum dots. Down-conversion delivers high-grade entangled photon pairs, whereas quantum dots excel at producing single photons. We report on an experiment that joins these two technologies and investigates the conditions under which optimal interference between these dissimilar light sources may be achieved.
Typically, quantum superpositions, and thus measurement projections of quantum states involving interference, decrease (or increase) monotonically as a function of increased distinguishability. Distinguishability, in turn, can be a consequence of decoherence, for example caused by the (simultaneous) loss of excitation or due to inadequate mode matching (either deliberate or indeliberate). It is known that for some cases of multi-photon interference, non-monotonic decay of projection probabilities occurs, which has so far been attributed to interference between four or more two photons. We show…
We quantitatively investigate the non-classicality and non-locality of a whole new class of mixed disparate quantum and semiquantum photon sources at the quantum-classical boundary. The latter include photon added thermal and photon added coherent sources, experimentally investigated recently by Zavatta et al. [Phys. Rev. Lett. 103, 140406 (2009)]. The key quantity in our investigations is the visibility of the corresponding photon-photon correlation function. We present explicit results on the violations of the Cauchy-Schwarz inequality - which is a measure of nonclassicality - as well as of …
Interference as a statistical consequence of conjecture on time quant
我们分析了一个猜想的统计后果，存在一个基本的（不可分割的）quant的时间。我们研究离散时间的粒子动力学。我们表明，量子干涉图案可以出现作为确定性粒子的统计效应，即粒子的轨迹和服从确定性动力学方程，如果一个引入离散时间。作为这一概念的演示，我们考虑粒子散射屏幕上的狭缝。我们研究如何产生的干扰图片依赖于模型的参数。由此产生的干扰图片有一个非平凡的最小值-最大值分布消失，时间离散参数为零。这幅图在性质上与量子实验中得到的图相同。这幅图包含了一些有趣的非经典性质，比如狭缝中心后面的“黑色”区域。
Quantum coupling between mechanical oscillators and atomic gases generating entanglement has been recently experimentally demonstrated using their subsequent interaction with light. The next step is to build a hybrid atom-mechanical quantum gate showing bosonic interference effects of single quanta in the atoms and oscillators. We propose an experimental test of Hong-Ou-Mandel interference between single phononic excitation and single collective excitation of atoms using the optical connection between them. A single optical pulse is sufficient to build a hybrid quantum-nondemolition gate to ob…
We numerically show that time delayed coherent feedback controls the statistical output characteristics of driven quantum emitters. Quantum feedback allows to enhance or suppress a wide range of classical and nonclassical features of the emitted quantum light. As exemplary quantum system, we use a pumped cavity containing two emitters. By applying phase-selective feedback, we demonstrate that photon antibunching and bunching can be increased in orders of magnitude due to intrinsically and externally controllabe quantum interferences. Our modelling is based on a fully non-Markovian quantum simu…
Design of Qubit Readout Circuit for Purcell-Rate Suppression by Two-Path Interference
本文提出一种量子比特先耦合滤波谐振器再耦合读出谐振器的新型读出电路，通过调节谐振器-滤波器耦合强度精确控制 Purcell 衰减率和 ac Stark 因子，在提高量子比特状态可区分性的同时保持输出信号的非经典性。
On generalized probabilities: correlation polytopes for automaton logic and generalized urn models, extensions of quantum mechanics and parameter cheats
对非经典概率的三种扩展和重新解释进行了评述。(i)本文将量子力学的概率公理推广到迹1的自伴正算子。此外，我们还讨论了任意正规算子的笛卡尔分解和极分解，以及相应观测量的可操作性。因此，我们审查和强调使用的观察，最大限度地代表了上下文。(ii)在第二部分中，我们讨论了Pitowsky多面体的自动机逻辑以及广义瓮模型和评估方法，找到由此产生的布尔贝尔型（中）等式。(iii)最后，所谓的“参数作弊”的介绍，其中参数双射和非线性变换的方式，经典系统模仿量子相关性，反之亦然。甚至有可能引入比量子不等式更强的违反布尔-贝尔型不等式的参数欺骗，从而侵入Tsirelson极限。付出的代价是不统一。
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