共查询到20条相似文献,搜索用时 15 毫秒
1.
We propose a scheme for generating a genuine four-particle polarisation entangled state ︱χ00 that has many interesting entanglement properties and potential applications in quantum information processing. In our scheme, we use the weak cross-Kerr nonlinear interaction between field-modes and the non-demolition measurement method based on highly efficient homodyne detection, which is feasible under the current experiment conditions. 相似文献
2.
We propose a scheme for generating a hyperentangled four-photon cluster state that is simultaneously entangled in polarization modes and spatial modes. This scheme is based on linear optical elements, weak cross-Kerr nonlinearity, and homodyne detection. Therefore, it is feasible with current experimental technology. 相似文献
3.
Generating a four-photon polarization-entangled cluster state with homodyne measurement via cross-Kerr nonlinearity 下载免费PDF全文
We propose a protocol to generate a four-photon polarization-entangled cluster state with cross-Kerr nonlinearity by using the interference of polarized photons. The protocol is based on optical elements, cross-Kerr nonlinearity, and homodyne measurement, therefore it is feasible with current experimental technology. The success probability of our protocol is optimal, this property makes our protocol more efficient than others in the applications of quantum communication. 相似文献
4.
We propose a protocol to generate a Greenberger-Horne-Zeilinger (GHZ) state andWstate by using simple linear elements and quantum nondemolition detectors (QNDs). With the help of cross-Kerr nonlinearity, our protocol can generate the intended states with only one setup, and the probability of getting a W state is greatly increased when compared with previous schemes [Phys. Rev. A 75 (2007) 044301]. Also, our proposed protocol is realizable in experiments. 相似文献
5.
A scheme is proposed for generating multiphoton maximally entangled states among four modes. These schemes only use Kerr medium and polarization beam splitters and P homodyne measurements on coherent light fields, which can be efficiently implemented in quantum optical laboratories. It's comparatively easy to realize symmetric Dicke state of light fields in the scheme. The scheme can be generalized to produce N-qubit maximally entangled states. 相似文献
6.
We propose an efficient protocol for W polarization entangled state distribution over an arbitrary collective-noise channel with the help of the cross-Kerr nonlinearity. The entangled state in the frequency degree of freedom, which suffers little from the noise in an optical fiber, is used in the present protocol. The frequency entanglement can be transferred into polarization entanglement with the success probability of 100%. So, the three parities can share the maximally W polarization state with local operations and polarization independent wavelength division multiplexers which can erase distinguishability for frequency. 相似文献
7.
ZHAO ChunRan & YE Liu School of Physics & Materials Science Anhui University Hefei China School of Physics & Electronic Information Huaibei Normal University Huaibei 《中国科学:物理学 力学 天文学(英文版)》2011,(3)
A scheme is proposed for generating a multiphoton entangled cluster state among four modes. The scheme only uses Kerr medium, beam splitter and homodyne measurements on coherent light fields, which can be efficiently made in quantum optical laboratories. The photon in the signal mode is prepared in a superposition state of the vacuum state and one-photon state while the probe beam is initially set in a coherent state superposition. The strong probe mode interacts successively with multiple signal-mode photo... 相似文献
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9.
Schemes for two-qubit and three-qubit controlled gates based on cross-Kerr nonlinearity are proposed in this paper.The probability of the success of these gates can be increased by quantum nondemolition detectors,which are used to judge which paths the signal photons pass through.These schemes are almost deterministic and require no ancilla photon.The advantages of these gates over the existing ones include less resource consumption and a higher probability of success,which make our schemes more feasible with current technology. 相似文献
10.
提出两种实现多光子高维空间纠缠态的制备方案.首先给出一种基于后验选择技术的实现方案,此方案以一定的概率实现.然后以基于弱交叉科尔效应的控制路径(C-path)门为基础,给出任意双光子任意维度的空间纠缠态的制备方案,并将此方案推广到任意多光子任意维度的空间纠缠态的制备.这一制备方案的最大优点在于可以确定性的得到纠缠态,并且不需要复杂的后验选择技术,可以很方便的应用于量子信息过程,同时该方案在目前的实验条件下是可行的. 相似文献
11.
基于相干态和信号位的光子数态与弱交叉Kerr非线性相互作用后,会在相干态上产生相位变化,并结合极化分束器构造了一个奇偶校验测量装置. 用零差探测器对相干态的相位变化进行测量,实现对Bell态的非破坏区分. 再利用控制非门和斜置的极化分束器对两信号位光子进行控制非操作和单光子测量,完成对四个Bell态的完全区分. 用到的弱交叉Kerr非线性增加了区分方案在实验上实现的可行性. 相似文献
12.
基于相干态和信号位的光子数态与弱交叉Kerr非线性相互作用后,会在相干态上产生相位变化,并结合极化分束器构造了一个奇偶校验测量装置.用零差探测器对相干态的相位变化进行测量,实现对Bell态的非破坏区分.再利用控制非门和斜置的极化分束器对两信号位光子进行控制非操作和单光子测量,完成对四个Bell态的完全区分.用到的弱交叉Kerr非线性增加了区分方案在实验上实现的可行性. 相似文献
13.
We propose a method to construct an optical cluster-state analyzer based on cross-Kerr nonlinearity combined with linear optics elements. In the scheme, we employ two four-qubit parity gates and the controlled phase gate (CPG) from only the cross-Kerr nonlinearity and show that all the orthogonal four-qubit cluster states can be completely identified. The scheme is significant for the large-scale quantum communication and quantum information processing networks. In addition, the scheme is feasible and deterministic under current experimental conditions. 相似文献
14.
W. Xiong L. Ye 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,62(2):265-272
Based on the interference effect of indistinguishable
polarized photons leaking out of separated cavities with each atom trapped
in separate cavity, using quantum nondemolition detection, we propose the
robust schemes for the generation of N-atom GHZ state, three-atom W state
and four-atom cluster state with a certain success probability. In
Lamb-Dicke limit, the schemes do not require the simultaneous click of the
photon-detectors. These made the schemes more realizable in experiments.
Meanwhile, the advantage of the scheme is that the fidelity of the entangled
states is not affected by the atomic spontaneous, cavity decay, and
imperfection of the photodetectors. The schemes would be useful steps
towards long-distance quantum communication. 相似文献
15.
A nearly deterministic scheme for generation of multiphoton GHZ states with weak cross-Kerr nonlinearity 下载免费PDF全文
We propose a scheme to generate polarization-entangled multiphoton Greenberger-Horne-Zeilinger (GHZ) states based on weak cross-Kerr nonlinearity and subsequent homodyne measurement. It can also be generalized to produce maximally N-qubit entangled states. The success probabilities of our schemes are almost equal to 1. 相似文献
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A scheme, in which cross-Kerr nonlinearity is used for the Bell-state measurements and preparation of the resource of entanglement, is proposed for teleporting an entangled 2-photon state by using two polarization-photon Bell states as quantum channel based on cross-Kerr nonlinearity combined with linear optics elements such as polarization beam splitters and half wave plates. Teleportation of the entangled 2-photon polarization state can realized with certainty in principle. 相似文献
18.
Small M Yu D Harrison RG Robertson C Clegg G Holzer M Sterz F 《Chaos (Woodbury, N.Y.)》2000,10(1):268-277
We provide numerical evidence that the electrocardiogram data collected from pigs during induced ventricular fibrillation cannot be described by a monotonic nonlinear transformation of linearly filtered noise. To establish this we use surrogate techniques and apply two test statistics: (1) the Takens' maximum likelihood estimator of the Grassberger-Procaccia correlation dimension and (2) an improved correlation dimension estimation routine. The improved dimension estimates provide evidence that the correlation dimension of the underlying dynamics during the episode of VF in the first 30 s is slightly less than 6. This result is consistent and reproducible among subjects. (c) 2000 American Institute of Physics. 相似文献
19.
An analytical model for cross-Kerr nonlinearity in a four-level N-type atomic system with Doppler broadening 下载免费PDF全文
Dinh Xuan Khoa Nguyen Huy Bang Nguyen Le Thuy An Nguyen Van Phu Le Van Doai 《中国物理 B》2022,31(2):24201-024201
We present an analytical model for cross-Kerr nonlinear coefficient in a four-level N-type atomic medium under Doppler broadening.The model is applied to87 Rb atoms to analyze the dependence of the cross-Kerr nonlinear coefficient on the external light field and the temperature of atomic vapor.The analysis shows that in the absence of electromagnetically induced transparency(EIT)the cross-Kerr nonlinear coefficient is zero,but it is significantly enhanced when the EIT is established.It means that the cross-Kerr effect can be turned on/off when the external light field is on or off.Simultaneously,the amplitude and the sign of the cross-Kerr nonlinear coefficient are easily changed according to the intensity and frequency of the external light field.The amplitude of the cross-Kerr nonlinear coefficient remarkably decreases when the temperature of atomic medium increases.The analytical model can be convenient to fit experimental observations and applied to photonic devices. 相似文献
20.
A scheme is proposed for generating maximally entangled Dicke states among four modes. The scheme only uses Kerr medium and homodyne measurements on coherent light fields, which can be efficiently made in quantum optical laboratories. The scheme can be generalized to produce maximally entangled 2k-qubit states. 相似文献