S. V. Kuznetsov, A. V. Kyusev, O. V. Man'ko, N. V. Tcherniega
The process of stimulated Brillouin scattering is described by the model of two-dimensional oscillator. The phenomenon of entanglement which appears in the photon-phonon modes after the interaction with matter is discussed.
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Fundamental Limits of Eavesdropper Detection and Localization in Optical Fiber via Stimulated Brillouin Scattering
本文通过建立二元假设检验模型，比较现有技术与未来量子技术在光纤中利用受激发射布里渊散射检测窃听器的性能及量子极限。
Enhanced mechanical squeezing in an optomechanical system via backward stimulated Brillouin scattering
本研究提出利用后向受激布里渊散射增强多模光机械系统中达芬机械模式的压缩，通过相干声子-光子相互作用提供额外冷却通道，显著提高压缩度及热噪声鲁棒性，并有望推广至其他量子系统。
We study the role of stimulated Brillouin scattering in a fiber cavity by numerical simulations and a simple theoretical model and find good agreement between experiment, simulation and theory. We also investigate an optomechanical system based on a fiber cavity in the presence on the nonlinear Brillouin scattering. Using simulation and theory, we show that this hybrid optomechanical system increases optomechanical damping for low mechanical resonance frequencies in the unresolved sideband regime. Furthermore, optimal damping occurs for blue detuning in stark contrast to standard optomechanics…
Realizing highly sensitive interferometry is essential to accurate observation of quantum properties. Here we study two kinds of Ramsey interference fringes in a whispering-gallery resonator, where the coherent phonons for free evolution can be achieved by stimulated Brillouin scattering. These two different fringes appear, respectively, in the regimes of rotating wave approximation (RWA) and anti-RWA. Our work shows particularly that the anti-RWA Ramsey interference takes some quantum properties of squeezing, which enhances the strength and visibility of the fringes and shows robustness again…
Quantum-Enhanced Stimulated Brillouin Scattering Spectroscopy and Imaging
本研究首次利用低功率连续波激光器和铷原子蒸气产生的双模压缩光，实现量子增强受激布里渊散射，信噪比提升3.4 dB，为生物和材料科学的光谱与成像应用提供高灵敏度新方案。
We observe competition between the modulation instability (MI) and stimulated Brillouin scattering (SBS) in a 9.2-GHz broadband SBS slow light device, in which a standard 20-km-long single-mode LEAF fibre is used as the SBS medium. We find that MI is dominant and depletes most of the pump power when we use an intense pump beam at ~1.55 μm, where the LEAF fibre is anomalously dispersive. The dominance of the MI in the LEAF-fibre-based system suppresses the SBS gain, degrading the SBS slow light delay and limiting the SBS gain-bandwidth to 126 dB \cdot GHz. In a dispersion-shifted highly nonline…
Optomechanical entanglement induced by backward stimulated Brillouin scattering
提出基于后向受激布里渊散射（BSBS）的光机械纠缠生成方案，通过增强机械耦合强度使纠缠提升至少一个数量级，且对热涨落稳健，可应用于量子信息处理、传感与计算。
We present a multimode Hamiltonian formulation for the problem of opto-acoustic interactions in optical waveguides. We establish a Hamiltonian representation of the acoustic field and then introduce a full system with a simple opto-acoustic coupling that includes both photoelastic/electrostrictive and radiation pressure/moving boundary effects. The Heisenberg equations of motion are used to obtain coupled mode equations for quantized envelope operators for the optical and acoustic fields. We show that the coupling coefficients obtained coincide with those established earlier, but our formalism…
Quantum Information-Theoretic Analysis of Optical Fiber Sensing via Stimulated Brillouin Scattering
该研究开发基于受激布里渊散射的光纤传感与入侵检测的量子信息理论框架，推导相关输入输出关系，确定最优测量设置，提出自适应方法并将其应用于光纤窃听检测。
We discuss the generation of two-atom entanglement inside a resonant microcavity under stimulated emission (STE) interaction. The amount of entanglement is shown based on different atomic initial state. For each kind of intial state, we obtain the entanglement period and the entanglement critical point, which are found to deeply depend on driving field density. In case of atomic state $| ee >$, the entanglement can be induced due to STE. In case of atomic state $| eg >$, there is a competition between driving field indued entanglement and STE induced entanglement. When two atoms are initially …
We propose a scheme of generating and verifying mesoscopic-level entanglement between two atomic ensembles using non-resonant stimulated Raman scattering. Entanglement can be generated by direct detection or balanced homodyne detection of the Stokes fields from the two cells, after they interfere on a beam splitter. The entanglement of the collective atomic fields can be transferred to the anti-Stokes fields in a readout process. By measuring the operator moments of the anti-Stokes fields, we can verify the presence of entanglement. We model the effects of practical factors such as Stokes fiel…
A multiparticle quantum superposition state has been generated by a novel phase-selective parametric amplifier of an entangled two-photon state. This realization is expected to open a new field of investigations on the persistence of the validity of the standard quantum theory for systems of increasing complexity, in a quasi decoherence-free environment. Because of its nonlocal structure the new system is expected to play a relevant role in the modern endeavor on quantum information and in the basic physics of entanglement.
Stimulated Brillouin interaction between sound and light, known to be the strongest optical nonlinearity common to all amorphous and crystalline dielectrics, has been widely studied in fibers and bulk materials but rarely in optical microresonators. The possibility of experimentally extending this principle to excite mechanical resonances in photonic microsystems, for sensing and frequency reference applications, has remained largely unexplored. The challenge lies in the fact that microresonators inherently have large free spectral range, while the phase matching considerations for the Brillou…
In the well-known stimulated Brillouin scattering (SBS) process, spontaneous acoustic phonons in materials are stimulated by laser light and scatter the latter into a Stokes sideband. SBS becomes more pronounced in optical fibers and has been harnessed to amplify optical signals and even achieve lasing. Exploitation of SBS has recently surged on integrated photonics platforms as simultaneous confinement of photons and phonons in waveguides leads to drastically enhanced interaction. Instead of being optically stimulated, coherent phonons can also be electromechanically excited with very high ef…
We investigate the performance of a certain nonclassicality identifier, expressed via integrated second-order intensity moments of optical fields, in revealing bipartite entanglement of quantum-optical frequency combs (QOFCs), which are generated in both spontaneous and stimulated parametric down-conversion processes. We show that, by utilizing that nonclassicality identifier, one can well identify the entanglement of the QOFC directly from the experimentally measured intensity moments without invoking any state reconstruction techniques or homodyne detection. Moreover, we demonstrate that the…
Dynamics of the one-dimensional open Ising chain under influence of $π$ -pulses is studied. It is shown that the application of a specific sequence of such instant kicks to selective spins stimulates arising of perfect dynamical pairwise entanglement between ends of the spin chain. Analytic formulas for the concurrence dynamics are derived. It is also shown that the time required to perfectly entangle the ends of the chains grows linearly with the number of spins in the chain. The final entangled state of the ending spins is always the same and does not depend on length the chain.
Optoacoustic entanglement in a continuous Brillouin-active solid state system
本文提出在连续布里渊有源固态波导中利用光泵浦脉冲激发斯托克斯过程，产生抗热涨落的光子-声子纠缠，并设计双泵浦同时探测方案实现读出，且无需预先制备声子基态。
Protocol for suppression of noise from stimulated multi-photon emissions in concatenated entanglement swapping links and quantum repeaters
本研究针对量子中继器等系统中受激多光子发射的噪声问题，提出交替BSM基的协议，消除误差随链长的二次增长，还可用于卫星辅助纠缠分发，并基于Clifford代数给出任意链长Bell态保真度的简洁表达式。
Inspired by laser operation, we address the question of whether stimulated emission into polarization entangled modes can be achieved. We describe a state produced by stimulated emission of the singlet Bell state and propose a setup for creating it. As a first important step towards an entangled-photon laser we demonstrate experimentally interference-enhanced polarization entanglement.
Coincidence free certification and quantification of spatial entanglement with stimulated parametric down conversion
研究利用受激参量下转换，通过用经典光束注入信号模式并测量受激闲频场，以强度测量取代双光子符合计数来认证空间纠缠，可用于困难耗时条件下光子对源纠缠特性研究。
We show that it is possible to entangle three different many-particle states by Bragg spectroscopy with nonclassical light in a Bose condensate of weakly interacting atomic gases. Among these three states, two are of atoms corresponding to two opposite momentum side-modes of the condensate; and the other is of single-mode photons of the output probe beam. We demonstrate strong dependence of the multiparticle entanglement on the quantum statistics of the probe light. We present detailed results on entanglement keeping in view of the possible experimental situation.
Curvature effects on stimulated parametric down-conversion process: an analog model
本文利用广义相对论类比模型，以双模球相干态为输入，研究空间曲率对受激参量下转换输出纠缠及非经典性质的影响，表明曲率可用于实验调控纠缠。
We propose an experiment for entangling two spatially separated Bose-Einstein condensates by Bragg scattering of light. When Bragg scattering in two condensates is stimulated by a common probe, the resulting quasiparticles in the two condensates get entangled due to quantum communication between the condensates via probe beam. The entanglement is shown to be significant and occurs in both number and quadrature phase variables. We present two methods of detecting the generated entanglement.
Slow Light through Brillouin Scattering in Continuum Quantum Optomechanics
提出利用双泵浦受激布里渊散射在纳米光纤中实现无增益无损耗、宽带宽的单光子级慢光，并分析热声子噪声可忽略的条件。
We introduce a convenient set of analytical tools (the Gaussian formalism) and diagrams (symplectic circuits) to analyze multi-mode scattering events in analog gravity, such as pair-creation a lá Hawking by black hole and white hole analog event horizons. The diagrams prove to be valuable ansatzes for the scattering dynamics, especially in settings where direct analytic results are not straightforward and one must instead rely on numerical simulations. We use these tools to investigate entanglement generation in single- and multi-horizon scenarios, in particular when the Hawking process is sti…
Brillouin light storage for 100 pulse widths
本研究实验实现了150 ps超短光脉冲的布里渊光存储，创纪录地延迟了15 ns（100个脉冲宽度），为实用布里渊延迟线等光学处理应用迈出重要一步。
Stimulated emission tomography for efficient characterization of spatial entanglement
本文利用受激发射层析测量BBO晶体SPDC纠缠光子对在LG基下的联合空间模式分布，实现了与理论相符的高效高维空间纠缠表征。
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