Vladyslav C. Usenko, Bohdan I. Lev
The large-alphabet quantum cryptography protocol based on the two-mode coherently correlated multi-photon beams is proposed. The alphabet extension for the protocol is shown to result in the increase of the QKD effectiveness and security.
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
A detailed derivation of the master equation of the cavity radiation of a coherently prepared $Y$-shaped four-level correlated emission laser is presented. The outline of the procedures that can be employed in analytically solving the stochastic differential equations and the rate equations of various correlations are also provided. It is shown that coherently preparing the atoms in the upper two energy levels and the lower, initially, can lead to a genuine continuous variable tripartite entanglement. Moreover, preparing the atoms in the coherent superposition, other than the possible maximum …
Analysis of the dynamics of the cavity radiation of a coherently pumped correlated emission laser is presented. The phase fluctuation and dephasing are found to affect the time evolution of the two-mode squeezing and intensity of the cavity radiation significantly. The intensity and degree of the two-mode squeezing increase at early stages of the process with time, but this trend changes rapidly afterwards. It is also shown that they increase with phase fluctuation and dephasing in the strong driving limit, however the situation appears to be opposite in the weak driving limit. This essentiall…
This work is the development and analysis of the recently proposed quantum cryptographic protocol, based on the use of the two-mode coherently correlated states. The protocol is supplied with the cryptographic control procedures. The quantum noise influence on the channel error properties is examined. State detection features are proposed.
This work is the development and analysis of the recently proposed quantum cryptographic protocol, based on the use of the two-mode coherently correlated states. The protocol is supplied with the cyrptographic control procedures. The channel error properties and stability against eavesdropping are examined. State detection features are proposed.
We describe a general technique that allows for an ideal transfer of quantum correlations between light fields and metastable states of matter. The technique is based on trapping quantum states of photons in coherently driven atomic media, in which the group velocity is adiabatically reduced to zero. We discuss possible applications such as quantum state memories, generation of squeezed atomic states, preparation of entangled atomic ensembles and quantum information processing.
Coherently excited Hong-Ou-Mandel effects using frequency-path correlation
提出相干版 Hong-Ou-Mandel 效应，利用衰减激光和同步调制器在独立 Mach-Zehnder 干涉仪中制备频率相关相干光子对，揭示反关联与纠缠的基础物理机制。
Coherently excited nonlocal quantum features using polarization-frequency correlation between quantum erasers
本文基于泊松分布相干光子对的偏振-频率关联，利用门控外差探测和滤波技术实现类空间分离量子擦除器间的非局域关联，并数值验证了贝尔不等式违背。
In this paper, we show that it is possible to significantly boost the heat extraction ability of the ICO fridge by applying N identical thermalising channels in a superposition of N cyclic causal orders[2], and that this can be further boosted in the ultracold regime by replacing the working qubit with a quDit working substance. Moreover, we show that for the alternative controlled-SWAPs scheme presented in [1] where one additionally has access to the reservoir qubits which are quantum correlated with the control-target system, the performance can be greatly enhanced in general (tripled for al…
Coupling free electrons to a trapped-ion quantum computer
本文提出将自由电子与囚禁离子量子计算机相干耦合，实现非破坏性量子检测和多电子信息累积，用于量子增强的电子显微镜应用。
We study the information transmission through a quantum channel, defined over a continuous alphabet and losing its energy en route, in presence of correlated noise among different channel uses. We then show that entangled inputs improve the rate of transmission of such a channel.
Single particle states in a chain with quasiperiodic potential show a metal-insulator transition upon the change of the potential strength. We consider two particles with local interaction in the single particle insulating regime. The two particle states change from being localized to delocalized upon an increase of the interaction strength to a nonperturbative finite value. At even larger interaction strength the states become localized again. This transition of two particle bound states into a correlated metal is due to a resonant mixing of the noninteracting two particle eigenstates. In the…
Quantum correlated steady states under competing collective and individual decay
研究量子相关稳态在集体和个体衰减竞争下的表现，发现多体态混合和动态切换现象，揭示了集体耗散在去相关个体衰减下的出现机制。
We study the impact of coherently generated lattice photons on an atomic Mott insulator subjected to a uniform force. Analogous to an array of tunnel-coupled and biased quantum dots, we observe sharp, interaction-shifted photon-assisted tunneling resonances corresponding to tunneling one and two lattice sites either with or against the force, and resolve multiorbital shifts of these resonances. By driving a Landau-Zener sweep across such a resonance, we realize a quantum phase transition between a paramagnet and an antiferromagnet, and observe quench dynamics when the system is tuned to the cr…
Relaxation effects impose fundamental limitations on our ability to coherently control quantum mechanical phenomena. In this letter, we establish physical limits on how closely can a quantum mechanical system be steered to a desired target state in the presence of relaxation. In particular, we explicitly compute the maximum coherence or polarization that can be transferred between coupled nuclear spins in the presence of very general decoherence mechanisms that include cross-correlated relaxation. We give analytical expressions for the control laws (pulse sequences) which achieve these physica…
Correlated emission lasing in a single quantum dot embedded inside a bimodal photonic crystal cavity
本文利用极化子变换主方程研究了双模光子晶体腔中单量子点的关联发射激射，发现低温下关联发射可抑制量子噪声，并探讨了腔模式间的连续变量纠缠产生。
High-Performance Quantum Transduction with Correlated Noise
本文将关联噪声作为资源，分别优化直接与基于纠缠的量子转导性能，使其在实验相关协同参数范围内获得正量子容量，降低了微波-光量子转导的低温要求，为混合量子网络提供理论指导。
Multi-mode quantum correlation generated from an unbalanced SU(1,1) interferometer using ultra-short laser pulses as pump
本文理论研究了超短脉冲泵浦的非平衡SU(1,1)干涉仪产生的多模量子关联，解析推导了协方差矩阵，发现给定模式与5个其他模式最大关联，并比较了两种相干合并方案，为量子信息技术提供理论描述。
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。
Dual epitaxial telecom spin-photon interfaces with correlated long-lived coherence
本研究通过自下而上外延薄膜平台，实现了双铒电信自旋-光子界面，同时获得毫秒级自旋相干和亚千赫兹光学退相干，为长距离量子网络奠定基础。
We study the generation of strongly correlated photons by coupling an atom to photonic quantum fields in a one-dimensional waveguide. Specifically, we consider a three-level or four-level system for the atom. Photon-photon bound states emerge as a manifestation of the strong photon-photon correlation mediated by the atom. Effective repulsive or attractive interaction between photons can be produced, causing either suppressed multiphoton transmission (photon blockade) or enhanced multiphoton transmission (photon-induced tunneling). As a result, nonclassical light sources can be generated on dem…
An efficient simulator for quantum systems is one of the original goals for the efforts to develop a quantum computer [1]. In recent years, synthetic dimension in photonics [2] have emerged as a potentially powerful approach for simulation that is free from the constraint of geometric dimensionality. Here we demonstrate a quantum-correlated synthetic crystal, based upon a coherently-controlled broadband quantum frequency comb produced in a chip-scale dynamically modulated lithium niobate microresonator. The time-frequency entanglement inherent with the comb modes significantly extends the dime…
Many technologies emerging from quantum information science heavily rely upon the generation and manipulation of entangled quantum states. Here, we propose and demonstrate a new class of quantum interference phenomena that arise when states are created in and coherently converted between the propagating modes of an optical microcavity. The modal coupling introduces several new creation pathways to a nonlinear optical process within the device, which quantum mechanically interfere to drive the system between states in the time domain. The coherent conversion entangles the generated biphoton sta…
Driving Quantum Correlated Atom-Pairs from a Bose-Einstein Condensate
本文研究通过周期性调制两体s波散射长度共振放大玻色-爱因斯坦凝聚体中的准动量对，解释了类似烟花的飞行时间图案源于两体关联振幅增长，并提出用Ramsey干涉术探测关联原子对的实验方案。
Correlated Pair Creation with Positive- and Negative-Frequency Oscillators in a Trapped-Ion Quantum Simulator
该研究在囚禁离子量子模拟器中，通过调控双模量子Rabi模型的频率符号，实现关联对产生，构建双模参量放大器并产生多种纠缠态，还提出了可在现有平台实现的方案。
Halide perovskite artificial solids as a new platform to simulate collective phenomena in doped Mott insulators
本文提出由卤化铅钙钛矿纳米立方体构成的人工晶格作为模拟关联量子材料的新平台，通过超快光注入量子限域激子实现掺杂，发现激子气体在强光掺杂下经历激子Mott相变，在弱掺杂下形成集体超辐射态，验证了Hubbard模型中长程与相位相干序的涌现。
In this paper, we demonstrate the generation of high-performance entangled photon-pairs in different degrees of freedom from a single piece of fiber pigtailed periodically poled LiNbO$_3$ (PPLN) waveguide. We utilize cascaded second-order nonlinear optical processes, i.e. second-harmonic generation (SHG) and spontaneous parametric down conversion (SPDC), to generate photon-pairs. Previously, the performance of the photon pairs is contaminated by Raman noise photons from the fiber pigtails. Here by integrating the PPLN waveguide with noise rejecting filters, we obtain a coincidence-to-accidenta…
Angular momentum of rotating fermionic superfluids by Sagnac phonon interferometry
研究通过声子干涉度量揭示费米超流体在BEC-BCS交叉点的复合性质，发现超流旋转向量为h/2m，不同于玻色凝聚体的h/m。
Multi-Photon Lasing Phenomena in Quantum Dot-Cavity QED
本研究探讨量子点-腔QED系统中多光子激光现象，通过极化子变换主方程和量子激光理论，分析了不同量子点结构和耦合腔体下的多光子发射机制及非经典光源特性。
One of the most important tasks in modern quantum science is to coherently control and entangle many-body systems, and to subsequently use these systems to realize powerful quantum technologies such as quantum-enhanced sensors. However, many-body entangled states are difficult to prepare and preserve since internal dynamics and external noise rapidly degrade any useful entanglement. Here, we introduce a protocol that counterintuitively exploits inhomogeneities, a typical source of dephasing in a many-body system, in combination with interactions to generate metrologically useful and robust man…
A Candidate Framework for Free-Space Quantum Key Distribution based on Geometrical-Configuration Modulation
提出一种基于几何构型调制（GM）的自由空间量子密钥分发（QKD）候选框架，通过可调源分离R定义单光子空间叠加态，利用远场探测坐标x进行软输入信息协调，并引入R-Δx扩展以抑制慢漂移。
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。