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1.
This paper proposes a scheme to generate a new χ-type four-atom
entangled state for the first time by using linear optics elements,
four one-sided cavities (one three-level atom) and a conventional
photon detector. The linear optical elements and conventional photon
detector are simple and accessible in experiments, which makes the
scheme more feasible with current technology. In addition, the
state |χ003214 with probability 1 can be generated
as long as there is no photon loss. 相似文献
2.
光辐射传感器的定标是保证遥感数据精度及可利用价值的基础支撑技术。现行辐射定标方法都需要建立高精度初级标准及标准传递链,传递环节是误差的主要来源。纠缠光子理论为实现“无标准传递”的辐射定标开辟了崭新的技术途径。报道了在光子计数模式下利用非线性光学的非经典效应绝对定标光电探测器的新方法,测量是通过BBO非线性晶体的参量下转换形成的702nm简并的纠缠光子方法来实现的。实验测得光电倍增管在该波长处的量子效率,结果显示有0.1%的偏差。该方法本身具有绝对性,不依赖于任何外部定标的辐射标准。 相似文献
3.
H.-Y. Fan Y.-L. Yang 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,39(1):107-113
For an asymmetric beam-splitter a new kind of entangled state
is introduced, we then derive the integration
measure with which such states can make up a complete and orthonormal
representation in two-mode Fock space. We then show how to use
in finding new squeezing operator and new
squeezed state, whose generation can relies on the asymmetric beamsplitter. 相似文献
4.
《Laser \u0026amp; Photonics Reviews》2017,11(3)
A scheme for active temporal‐to‐spatial demultiplexing of single photons generated by a solid‐state source is introduced. The scheme scales quasi‐polynomially with photon number, providing a viable technological path for routing n photons in the one temporal stream from a single emitter to n different spatial modes. Active demultiplexing is demonstrated using a state‐of‐the‐art photon source—a quantum‐dot deterministically coupled to a micropillar cavity—and a custom‐built demultiplexer—a network of electro‐optically reconfigurable waveguides monolithically integrated in a lithium niobate chip. The measured demultiplexer performance can enable a six‐photon rate three orders of magnitude higher than the equivalent heralded SPDC source, providing a platform for intermediate quantum computation protocols.
5.
We analyze entanglement properties of entangled coherent state (ECS), |α,0) 1,2 +|0,α) 1,2, with and without photon losses. By separating the coherent state into ]a) = co|0) + √-Co2|α), we derive exact results of the logarithmic negativity EN, which quantifies the degree of entanglement between the two bosonic modes. Without particle losses, E~ = 1 for the NOON state; while for the ECS, E jr increases from 0 to 1 as |α|-→∞. In the presence of photon losses, we find that the ECS with large enough photon number is more robust than that of the NOON state. An optimal ECS is obtained by maximizing E~ with respect to l a 12. 相似文献
6.
G.A. Barbosa 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2003,22(3):433-440
Quantum states of twin photons entangled in angular momentum and polarization provide new degrees of freedom to researchers
in quantum information and imaging. This work discuss these states and also emphasizes differences between two proposed models
for twin photons entangled in angular momentum. Answers to the presented questions would contribute to a better understanding
of this nonlinear process.
Received 30 August 2002 / Received in final form 10 October 2002 Published online 21 January 2003 相似文献
7.
8.
We propose a nearly perfect optical scheme for the quantum teleportation of
entangled coherent states using optical devices such as nonlinear Kerr media, beam
splitters, phase shifters, and photon detectors. Different from those previous
schemes, our scheme needs only ``yes' or `no' measurements of the photon number of
the related modes, i.e. nonzero- and zero-photon measurements, while in previous
schemes one has to exactly identify the even or odd parity character of the photon
numbers detected by detectors. 相似文献
9.
自发参量下转换过程制备的纠缠光源在量子光学及其相关领域有着广泛的应用.本文利用780 nm的分布式布拉格反射镜激光二极管抽运一块长10 mm的Ⅱ类准相位匹配的周期极化铌酸锂波导,产生了偏振正交的频率反关联纠缠光子对.通过实验结果与理论的完美结合得到,当进入波导的抽运光功率为44.9 mW时,下转换双光子对的产生速率为1.87×10~7s~(-1).利用单色仪对下转换光子的频谱进行分析,得到信号和闲置光子的中心波长分别为1561.43 nm和1561.45 nm,频谱宽度为3.62 nm和3.60 nm,双光子符合包络宽度约为3.18 nm,可以得到双光子的频率纠缠度为1.131.00,表征了双光子的频率纠缠特性.利用Hong-Ou-Mandel干涉仪测量双光子的二阶量子干涉特性,测得的干涉可见度为96.1%,干涉图谱的凹陷宽度为1.47 ps. 相似文献
10.
We propose the methods of generating multipartite entanglement by considering the interaction of a system of N two-level atoms in M cavities of high quality factor with a strong classical driving field. It is shown that, with the cavity detuning, the applied driving field detuning and vacuum Rabi coupling, we can produce an entangled coherent state in two single-mode cavities and generate the entangled coherent cluster states in two bimodal vacuum cavities. Tuning these parameters also allows us to acquire the anti-Jaynes-Cummings (AJC) interaction, with which we can generate the maximally two-photon entangled states, and the two-atom and the two-photon entangled cluster states. 相似文献
11.
Entanglement diversion and quantum teleportation of entangled coherent states 总被引:2,自引:0,他引:2 下载免费PDF全文
The proposals on entanglement diversion and quantum teleportation of
entangled coherent states are presented.In these proposals, the entanglement between two coherent states, $|\alpha\rangle$ and $|-\alpha\rangle$, with the same amplitude but a phase difference
of $\pi$ is utilized as a quantum channel. The processes of the entanglement diversion and the teleportation are achieved by using the 50/50 symmetric beam splitters, the phase shifters and the photodetectors with the help of classical information. 相似文献
12.
Probabilistic teleportation scheme of two-mode entangled photon states by using linear optic element
XIANG Shao-hua 《原子与分子物理学报》2003,20(3):425-428
A scheme for teleporting two-mode entangled photon states with the successful probability 33.3% is Proposed. In the sehane, the tdeported qubit is two-mode photon entangled states, and two pairs of EPR pair are usedas quantum channel between a sender and a recciver. This procedure is achieved by using two 50/50 symmetric beam aplitters and four photon number detectors with the help of classical information. 相似文献
13.
14.
15.
X. L. Zhang Y. X. Zhang M. Feng 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,51(2):275-282
We propose a deterministic scheme for generation of highly entangled photon states using a high-Q two-mode optical cavity and the dark state evolution. Because of the adiabatic operation, our proposal is robust to ambient
noise, and the relevant dynamics is insensitive to the randomness of moderate fluctuations regarding experimental parameters.
Our scheme not only works deterministically, but also has the advantage of achieving highly entangled photons by adiabatically
increasing or decreasing the Rabi frequencies regarding the classical driving pulses, which would be practical in real implementation.
Our scheme can also be extended to generation of multiphoton entanglement. 相似文献
16.
The preparation of multipartite entangled states is the prerequisite for exploring quantum information networks and quantum computation.In this paper,we review the experimental progress in the preparation of cluster states and multi-color entangled states with continuous variables.The preparation of lager scale multipartite entangled state provide valuable quantum resources to implement more complex quantum informational tasks. 相似文献
17.
双模纠缠相干光场与V型三能级原子相互作用系统的光子统计性质 总被引:4,自引:7,他引:4
本文采用求解Schrodinger方程和数值计算方法,研究了双模纠缠相干光场与三能级原子相互作用系统的光子统计性质,结果表明:此性质与双模纠缠相干光场的纠缠程度、失谐量、双模光的平均光子数和原子的初态相关联. 相似文献
18.
Controlling spontaneous emission (SE) is of fundamental importance to a diverse range of photonic applications including but not limited to quantum optics, low power displays, solar energy harvesting and optical communications. Characterized by photonic bandgap (PBG) property, three‐dimensional (3D) photonic crystals (PCs) have emerged as a promising synthetic material, which can manipulate photons in much the same way as a semiconductor does to electrons. Emission tunable nanocrystal quantum dots (QDs) are ideal point sources to be embedded into 3D PCs towards active devices. The challenge however lies in the combination of QDs with 3D PCs without degradation of their emission properties. Polymer materials stand out for this purpose due to their flexibility of incorporating active materials. Combining the versatile multi‐photon 3D micro‐fabrication techniques, active 3D PCs have been fabricated in polymer‐QD composites with demonstrated control of SE from QDs. With this milestone novel miniaturized photonic devices can thus be envisaged. 相似文献
19.
与两等同Bell态纠缠原子相互作用光场的量子场熵 总被引:1,自引:1,他引:1
利用全量子理论,并通过数值计算,研究了初始处于Fock态的单模光场与两等同双能级纠缠原子单光子共振相互作用过程中单模光场量子场熵的时间演化特性.结果发现:当两原子初始处于第一种Bell态时,光场量子场熵的时间演化周期为π/g2(2n+1);随着初始光强的增大,光场与原子之间的量子纠缠现象减弱;特别是当时间t为演化周期的整数倍时,场-原子系统处于退纠缠状态.当两原子初始处于第二种Bell态时,光场量子场熵不随时间变化,恒为零.当两原子初始分别处于第三种和第四种Bell态时,光场量子场熵的时间演化曲线呈现不等幅周期振荡现象;并且随着初始光场光子数的增加,光场量子场熵的振荡周期逐渐增大,但振荡幅值逐渐减小. 相似文献
20.
反Tavis-Cummings模型中纠缠原子布居的时间演化 总被引:1,自引:0,他引:1
利用反Tavis-Cummings模型研究了初始处于纠缠态的两个全同二能级原子与单模二项式光场的相互作用.在强经典驱动和大失谐的情况下,原子与光场的相互作用可以转化为有效的Tavis-Cummings模型和反Tavis-Cummings模型.主要是研究了反Tavis-Cummings模型下纠缠原子布居的时间演化.结果表明,纠缠原子布居的时间演化和光场的强度以及光场的初始状态有关. 相似文献