共查询到18条相似文献,搜索用时 93 毫秒
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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
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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
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自发参量下转换对应于一种非线性光学过程, 实验上作为一种标准方法, 人们利用自发参量下转换源产生纠缠光子对. 本文考虑由自发参量下转换源产生三对纠缠光子的情况. 通过使用由几组偏振光 束分束器、分束器和半波片等线性光学器件组成的量子线路演化三对光子, 给出了一个高效制备 包含偏振纠缠和空间纠缠的六光子超纠缠态方案. 因为方案中包含了参量下转换源产生三对纠缠光子 的所有可能情况, 所以本方案有很高的效率. 基于弱非线性介质构建了一个量子非破坏性测量装置, 用于区分光子在两指定的空间模中的两种分布情况. 特别地, 方案中可以通过合理约束在量子非破坏性测量过程中引入的非线性强度来达到实际实验所限定的数量级, 因此, 该方案易于在实验上实现. 相似文献
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研究了一般形式类GHZ(Greenberger-Horne-Zeilinger)态的共生纠缠度及非定域性, 给出了类GHZ纠缠态的共生纠缠、Mermin不等式和Svetlichny不等式的解析表达式, 并通过数值计算讨论纠缠与非定域性之间的关系. 结果表明, 类GHZ纠缠态的共生纠缠和两个Bell型不等式描述的非定域性是一致的, Bell算符及其参量, 能够明显展示量子态的非定域特性.
关键词:
量子信息
类GHZ态
共生纠缠
Bell型不等式 相似文献
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由于贝尔态测量是量子信息处理的前提,因此提出了一种针对贝尔态的非破坏性测量方案.在该方案中,将奇偶校验门作为关键器件,利用奇偶校验门不改变输入光子状态的特性实现了C-NOT门和Toffoli门.然后,将Toffoli门和Hadamard门结合实现了对4种贝尔态的确定性测量.所提方案可用于双光子纠缠态测量,并可推广到三光子纠缠态的应用场景中,为贝尔态测量与量子信息处理提供了新的思路. 相似文献
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利用三粒子W态隐形传送三粒子GHZ态 总被引:7,自引:1,他引:6
提出一个三粒子GHZ(Greenberger-Horne-Zeilinger)态从发送者传送给两个接收者中任意一个的量子隐形传送方案。此方案用两个三粒子W态作为量子信道。若发送者进行两次贝尔态测量和阿达码门操作,想得到所需传送的三粒子GHZ态的接收者引进一个辅助粒子,进行控制-非操作,同时根据另一个接收者的测量结果实施一个适当的幺正变换操作,可以一定的概率成功地隐形传送三粒子GHZ态。同时,此方案可推广至隐形传送n粒子GHZ态,这时也只需用两个三粒子W态作为量子信道,但这时想得到所需传送的n粒子GHZ态的接收者需引进(n-2)个辅助粒子,进行(n-2)次控制非操作,同时根据另一个接收者的测量结果实施一个适当的幺正变换操作,可以一定的概率成功地隐形传送n粒子GHZ态。 相似文献
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实现类自旋SU(1,1)腔场的GHZ态 总被引:1,自引:1,他引:0
提出了一种利用[1]-型原子与处于SU(1,1)相干态的腔场的相互作用实现类自旋腔场Greenberger-Horne-Zeilinger(GHZ)态的新方案,并通过对腔场宇称的测量,否定了局域隐变量理论,该方案不需要违背Bell不等式,同时,指出了该方案的适用范围。 相似文献
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We propose an efficient scheme for the generation of three-photon Greenberger–Horne–Zeilinger (GHZ) state with linear optics, nonlinear optics and postselection. Several devices are designed and a two-mode quantum nondemolition detection is introduced to obtain the desired state. It is worth noting that the states which have entanglement in both polarization and spatial degrees of freedom are created in one of the designed setups. The method described in the present scheme can create a large number of three-photon GHZ states in principle. We also discuss an approach to generate the desired GHZ state in the presence of channel noise. 相似文献
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We present a scheme for quantum superdense coding with hyperentanglement,in which the sender can transfer four bits of classical information by sending only one photon.The important device in the scheme is the hyperentangled Bell-state analyzer in both polarization and frequency degrees of freedom,which is also constructed in the paper by using a quantum nondemolition detector assisted by cross-Kerr nonlinearity.Our scheme can transfer more information with less resources than the existing schemes and is nearly deterministic and nondestructive. 相似文献
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Shi-Lei Su Long Zhu Qi Guo Hong-Fu Wang Ai-Dong Zhu Shou Zhang Kyu-Hwang Yeon 《Optics Communications》2012,285(20):4134-4139
We present a simplified symmetry analyzer (SA) with cross-Kerr nonlinearity, quantum non-demolition photon number measurement and basic optical elements. Based on the present symmetry analyzer (SA), all the Bell states can be discriminated nondestructively with nearly unity probability. In addition, with the help of cross-phase modulation (XPM) induced by giant cross-Kerr nonlinearity, three-photon Greenberger–Horne–Zeilinger (GHZ) state can also be discriminated determinately and nondestructively, which is supposed to be meaningful in quantum information processing. 相似文献
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Xiu-Min Lin Zhi-Hua Chen Gong-Wei Lin Xiao-Dong Chen Bin-Bin Ni 《Optics Communications》2009,282(16):3371-3374
With the ancillary one-sided cavities each trapping an alkali atom, the schemes for the analyzers of two-photon Bell states and three-photon Greenberger-Horne-Zeilinger (GHZ) states are proposed, respectively. Moreover, all of two-photon Bell states and three-photon GHZ states can be nondestructively distinguished. The influence of atomic spontaneous emission and output coupling inefficiency are discussed. 相似文献
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We present and implement a new scheme for extended multichannel selective femtosecond coherent control based on symmetry properties of the excitation channels. Here, an atomic nonresonant two-photon absorption channel is coherently incorporated in a resonance-mediated (2+1) three-photon absorption channel. By proper pulse shaping, utilizing the invariance of the two-photon absorption to specific phase transformations of the pulse, the three-photon absorption is tuned independently over an order-of-magnitude yield range for any possible two-photon absorption yield. Noticeable is a set of "two-photon dark pulses" inducing widely tunable three-photon absorption. 相似文献
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We propose a scheme for teleportation of an unknown two-qubit entangled state via trapped ions. In this scheme, we use the GHZ state as a quantum channel and the success probability can reach 1. The distinct advantage of our scheme is insensitive to the heating of the vibrational mode. In addition, Bell-state measurement is not required. 相似文献
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An experimental scheme on controlled quantum state transfer is proposed in cavity quantum electrodynamics (QED) without joint Bell-state measurement (BSM). A quantum state can be transferred perfectly with the help of the cooperation of the third side by constructing a three-atom GHZ entangled state as the controlled channel. This scheme is insensitive to the cavity decay and the thermal field. The probability of the success in our scheme is 1.0. 相似文献
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A scheme for teleporting an unknown three-particle GHZ state from a sender
to either one of two receivers is proposed. In this scheme, the quantum
channel is composed of two non-maximally three-particle entangled W states. An unknown three-particle GHZ state can be perfectly teleported
probabilistically if the sender performs two generalized Bell-state
measurements and the Hadamard operation while either one of two receivers
introduces an ancillary particle which is one of the final three particle
constituting the teleported state, then performs the controlled-not
operation with the ancillary particle as the target bit and introduces an
appropriate unitary transformation with the help of the other receiver's
simple measurements. All kinds of unitary transformations are given in
detail. The present scheme may be directly generalized to teleport an
unknown multiparticle GHZ state via two three-particle entangled W states
used as the quantum channel. 相似文献