Production of χc and ηc in Ultra-Peripheral Collisions with Two-Photon Processes

We calculate the production of χc and ηc by the two-photon process in ultra-peripheral heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies. The differential cross section of transverse momentum distribution and rapidity distribution for (H = χc and ηc), are estimated by using the equivalent photon flux in the impact parameter space. The numerical results indicate that the study of χc and ηc in ultra-peripheral heavy ion collisions are feasible at RHIC and LHC energies.

Crystal Structure and Characterization of a Dye with Two-photon Pumped Frequency-upconverted Lasing Properties

The title compound, trans 4 [p (N ethyl N (hydroxyethyl)amino) styryl] N methylpyridinium tetraphenylborate(abbreviated as ESMT, C 46 H 49 N 4OB) crystallizes in a space group P 1 with a =0 983 23(15) nm, b =1 410 73(16) nm, c =1 54 21(12) nm, α=95 252(13)°, β= 91 959(17)°, γ= 107 421(12)°, Z=2, F(000)=712, μ =0 1 mm -1 Mo Kα radiation, R =0 093 8. The result shows that the cation of the molecule almost lies in one plane, the hydroxyethyl group is perpendicular to the plane, the anion takes a slight distorted tetrahedral geometry. Also the thermal stability, two photon fluorescence, two photon pumped lasing property for the title compound were studied.

Enhancement of Squeezing in Two-Photon Jaynes-Cummings Model with Atomic Measurement

我们在 degeneratetwo 光子 Jaynes-Cummings 模型调查洞域的压榨的性质。与一个光子 Jaynes-Cummings 模型相比，压榨在在某些条件下面的二光子的 Jaynes-Cummings 模型的情况中是更显著的。

Two-photon Excited Fluorescence of Bithiophene Derivatives

Two new bithiophene derivatives named as 5, 5-bis(p-N,N-dimethylaminostyryl)-2, 2 -bithiophene (BMSBT), and 5, 5-bis(p-N,N-diethylaminostyryl)-2, 2-bithiophene (BESBT) have been synthesized. Both compounds can emit strong single-photon excited fluorescence (SPEF) and two-photon excited fluorescence (TPEF) with the emission peaks around ~560 nm and with the lifetime of ~1ns.

Level crossing in a two-photon Jaynes-Cummings model

In this paper,the energy spectrum of the two-photon Jaynes-Cummings model（TPJCM） is calculated exactly in the non-rotating wave approximation（non-RWA）,and we study the level-crossing problem by means of fidelity.A narrow peak of the fidelity is observed at the level-crossing point,which does not appear at the avoided-crossing point.Therefore fidelity is perfectly suited for detecting the level-crossing point in the energy spectrum.

Approximate and Conditional Teleportation of an Unknown Atomic State Without Bell-State Measurement with Two-Photon Interaction

一个计划为近似并且有条件地，在洞证完经由二光子的相互作用移植一个未知原子状态的电视被建议。它是裁判员的计划的延期。[11 ][Phys。加快。一 69 (2004 ) 064302 ] ，它基于 Jaynes—在证完的卡明斯模型并且在系统进化和实现远距传物的相应忠实的一个仅仅时间点被给的地方。在我们的计划，二光子的相互作用 Jaynes-Cummings 模型被用来认识到近似、有条件的远距传物。我们的计划不包含钟状态测量和一个另外的原子，仅仅要求二个原子和一个单个模式的洞。计划的忠实比裁判员的高。[11 ] 。计划可以借助于一个单个原子而且一个套住的离子的状态的远距传物被概括到一个洞模式的状态的远距传物到另一个模式不仅。

Functional micro‐concrete 3D hybrid structures f abricated by two‐photon polymerization

Arbitrary micro-scale three-dimensional(3D)structures fabrication is a dream to achieve many exciting goals that have been pursued for a long time.Among all these applications,the direct 3D printing to fabricate human organs and integrated photonic circuits are extraordinary attractive as they can promote the current technology to a new level.Among all the 3D printing methods available,two-photon polymerization(2PP)is very competitive as it is the unique method to achieve sub-micron resolution to make any desired tiny structures.For the conventional 2PP,the building block is the photoresist.However,the requirement for the building block is different for different purposes.It is very necessary to investigate and improve the photoresist properties according to different requirements.In this paper,we presented one hybrid method to modify the mechanical strength and light trapping efficiency of the photoresist,which transfers the photoresist into the micro-concretes.The micro-concrete structure can achieve±22%strength modification via a silica nano-particles doping.The structures doped with gold nano-particles show tunable plasmonic absorption.Dye doped hybrid structure shows great potential to fabricate 3D micro-chip laser.

Comment on “Approximate and Conditional Teleportation of an Unknown Atomic State Without Bell-State Measurement with Two-Photon Interaction”

在一个以前的工作[Commun。Theor。Phys。45 (2006 ) 79 ] 没有钟状态测量，一个计划在有效 Hamiltonian 途径经由二光子的贾内斯·卡明斯模型在一个证完洞为一个未知原子状态的近似、有条件的远距传物被介绍。这个评价介绍一个其他的方法，基于“所谓的完整的二光子的贾内斯·卡明斯·哈米尔托纳恩途径”。因此，它在洞内为任意的平均光子数字描述二光子的退化过程的进化，作为实现在这种情形的远距传物的正确方法。

Synthesis, Structure of a Symmetrically Substituted Stilbene with Strong Two-photon Absorption and Up-converted Blue Fluorescence

Efficient Ti-catalyzed reductive coupling methodology was first employed to synthesize the symmetrical bis-donor stilbene, trans-4, 4'-bis[diphenyl amino] stilbene (BDPAS). X-ray diffraction analyses reveal that this new crystal belongs to the triclinic crystal system of centro-symmetric P-1 space group. The DBPAS solution, with the linear transmission at wavelength of greater than or equal to 450 nm, possesses large two-photon absorption cross section as high as 39.4x10(-48) cm(4).s/photon resulting in strong two-photon induced blue fluorescence of 460 nm, pumped by 740 nm laser irradiation.

Incoherently Coupled Grey-Grey Spatial Soliton Pairs in Biased Two-Photon Photovoltaic Photorefractive Crystals

无条理地联合了灰灰色的屏幕光电的空间 soliton 对在不变的条件下面在偏导的二光子的光电的 photorefractive 晶体被预言。如果事件横梁有一样的极化，这些灰灰色的屏幕光电的 soliton 对能被建立，波长，并且是互相支离破碎的。灰灰色的屏幕光电的 soliton 对能被看作灰灰色的屏蔽 soliton 对和开或靠近电路的灰灰色的光电的 soliton 对的统一形式。

Crystal Structure, One-and Two-photon Excited Fluorescence and Bioimaging of a D-π-A Structural Triphenylamine Derivative

An electron donor-π-bridge-electron acceptor(D-π-A) optical functional organic compound comprising a triphenylamine moiety as the electron donor and pyridine moiety as the electron acceptor was synthesized. The structure of the compound was solved by single-crystal X-ray diffraction analysis. It crystallizes in monoclinic, space group P21, with a = 9.753(5), b = 8.815(5), c = 25.554(5) ?, β = 96.315(5)°, V = 2184(2) ?~3, Z = 2, D_c = 1.136 g/m^3, F(000) = 792, Μr = 746.92, μ = 0.069 mm^(-1), the final R = 0.0658 and wR = 0.1730 for 6790 observed reflections with I > 2(I). Study of nonlinear optical properties shows that the compound exhibits excellent two-photon excited fluorescence with the two-photon absorption cross-section value of 116 GM. The structure-property relationship was researched in detail through X-ray crystallography and quantum chemical calculation. Result of living cell imaging experiment shows its potential in fluorescence microscopy bioimaging.

Dynamic Equations and Nonlinear Dynamics of Cascade Two-Photon Laser

我们导出方程并且学习二光子的激光，在洞的电磁的地被协调地准备的三水平的原子和古典地在驾驶注入了洞的串联的非线性的动力学。如此的一个系统的动态方程被使用量 Langevin 操作员的技术导出，然后在不同开车条件下面数字地被学习。结果在某些条件下面显示出那二光子的激光能产生的串联混乱，加倍的时期，周期、稳定、双稳态的状态。混乱能被原子人口，原子连贯，和注射的古典地禁止。另外，没有混乱发生在光双性人稳定性。

Coherence Loss of Two-Photon Jaynes-Cummings Model in Dispersive Approximation

Completely solving the dissipative dynamics of nonlinear Jaynes-Cumming model is a very difficult task.In our recent work (Phys. Lett. A284 (2001) 156), we just obtained analytical results of the field dissipative dynamicsof the nonlinear JCM. In the present paper, employing the perturbative expansion of master equation, we obtain thedensity operator of the system (field +atom). The coherence losses of the system and of the atom are investigated whentwo-photon process is involved. We also study the effect of different atomic initial states and the influence of the fieldamplitude on the atomic coherence loss.

Preparation of optimal entropy squeezing state of atomic qubit inside the cavity via two-photon process and manipulation of atomic qubit outside the cavity

Considering two atomic qubits initially in Bell states, we send one qubit into a vacuum cavity with two-photon resonance and leave the other one outside. Using quantum information entropy squeezing theory, the time evolutions of the entropy squeezing factor of the atomic qubit inside the cavity are discussed for two cases, i.e., before and after rotation and measurement of the atomic qubit outside the cavity. It is shown that the atomic qubit inside the cavity has no entropy squeezing phenomenon and is always in a decoherent state before the operating atomic qubit outside the cavity. However,the periodical entropy squeezing phenomenon emerges and the optimal entropy squeezing state can be prepared for the atomic qubit inside the cavity by adjusting the rotation angle, choosing the interaction time between the atomic qubit and the cavity, controlling the probability amplitudes of subsystem states. Its physical essence is cutting the entanglement between the atomic qubit and its environment, causing the atomic qubit inside the cavity to change from the initial decoherent state into maximum coherent superposition state, which is a possible way of recovering the coherence of a single atomic qubit in the noise environment.

A scheme for two-photon lasing with two coupled flux qubits in circuit quantum electrodynamics

We theoretically study the system of a superconducting transmission line resonator coupled to two interacting super- conducting flux qubits. It is shown that under certain conditions the resonator mode can be tuned to two-photon resonance between the ground state and the highest excited state while the middle excited states are far-off resonance. Furthermore, we study the steady-state properties of the flux qubits and resonator, such as the photon statistics, the spectrum and squeezing of the resonator, and demonstrate that two-photon laser can be implemented with current experimental technology.

Characteristics of local photonic state density in an infinite two-dimensional photonic crystal

The local density of photonic states （LDPS） of an infinite two-dimensional （2D） photonic crystal （PC） composed of rotated square-pillars in a 2D square lattice is calculated in terms of the plane-wave expansion method in a combination with the point group theory. The calculation results show that the LDPS strongly depends on the spatial positions. The variations of the LDPS as functions of the radial coordinate and frequency exhibit “mountain chain” structures with sharp peaks. The LDPS with large value spans a finite area and falls abruptly down to small value at the position corresponding to the interfaces between two different refractive index materials. The larger/lower LDPS occurs inward the lower/larger dielectric-constant medium. This feature can be well interpreted by the continuity of electricdisplacement vector at the interface. In the frequency range of the pseudo-PBG （photonic band gap）, the LDPS keeps very low value over the whole Wiger-Seitz cell. It indicates that the spontaneous emission in 2D PCs cannot be prohibited completely, but it can be inhibited intensively when the resonate frequency falls into the pseudo-PBG.

Photonic Band Modulation in a Two-Dimensional Photonic Crystal with a One-Dimensional Periodic Dielectric Background

<Abstract>A two-dimensional photonic crystal with a one-dimensional periodic dielectric background is proposed.The photonic band modulation effects due to the periodic background are investigated based on the plane wave expansion method.We find that periodic modulation of the dielectric background greatly alters photonic band structures,especially for the E-polarization modes.The number,width and position of the photonie band gaps (PBGs) sensitively depend on the structure parameters (the layer thicknesses and dielectric constants) of the one-dimensional periodic background.

Two-photon Absorption and Optical Power Limiting Properties of Two Novel Dibenzothiophene-based Chromophores

Two novel V-shaped symmetric chromophores： E-2,8-bis（4-vinyl-4-carbazol-9-yl）diben- zothiophene （abbreviated as SK-G1） and E-2,8-bis（4-vinyl-4-triphenylamino） dibenzothiophene （abbreviated as ST-G1） have been synthesized and characterized. Their two photon absorption properties were measured by the open-aperture femtosecond Z-scan technique and the nanosecond nonlinear optical transmission （NLT）, respectively, when pumped by Ti： sapphire laser at 750 nm and 800 nm.