Entanglement swapping without joint measurement

Yang, Ming; Song, Wei; Cao, Zhuo‐Liang

doi:10.1103/physreva.71.034312

Cited by 92 publications

(93 citation statements)

References 11 publications

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“…But during the transmission of the particles, it will unavoidably couple with environments, and then the entanglement will degrade exponentially. So the entangled states after distribution are usually mixed ones, which need the purification process [23,24,26,28,29] before use. We consider the generation from two ions that are initially in mixed state.…”

Section: Generation Scheme For the Mixed Initial States Casementioning

confidence: 99%

“…These schemes require the two photons reach the BSA or PBS simultaneously. Motivated by Xing-Xiang Zhou's proposal on non-distortion quantum interrogation [22], we have proposed an entanglement purification scheme for arbitrary unknown ionic states via linear optics [23]. In this paper, we will propose a novel entanglement generation scheme, which is free of the problem of simultaneity.…”

Section: Introductionmentioning

confidence: 99%

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Generation of pure ionic entangled states via linear optics

Yang

Cao

2005

Phys. Rev. A

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In this paper, we propose a novel scheme to generate two-ion maximally entangled states from either pure product states or mixed states using linear optics. Our new scheme is mainly based on the ionic interference. Because the proposed scheme can generate pure maximally entangled states from mixed states, we denote it as purification-like generation scheme. The scheme does not need a Bell state analyzer as the existing entanglement generation schemes do, it also avoids the difficulty of synchronizing the arrival time of the two scattered photons faced by the existing schemes, thus the proposed new entanglement generation scheme can be implemented more easily in practice.

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Section: Generation Scheme For the Mixed Initial States Casementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generation of pure ionic entangled states via linear optics

Yang

Cao

2005

Phys. Rev. A

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“…To realize the purification process, two auxiliary atoms have been introduced [6]. For pure non-maximally entangled states of polarization photons, S. Bose et al have proposed a concentration scheme via entanglement swap- * Electronic address: mingyang@ahu.edu.cn † Electronic address: zlcao@ahu.edu.cn ping [7].In the previous contributions to entanglement purification and concentration, there is fewer schemes discussing the purification and concentration of entangled atomic states [8,9,10,11]. Hitherto, the purification and concentration of entangled photon states have been demonstrated in experiment [5,12,13], but the realization of purification and concentration of entangled atomic states are still under way.…”

mentioning

confidence: 99%

“…Hitherto, the purification and concentration of entangled photon states have been demonstrated in experiment [5,12,13], but the realization of purification and concentration of entangled atomic states are still under way. So it is necessary to explore the experimentally feasible physical schemes on the purification and concentration of entangled atomic states.In our former contributions, by using cavity QED techniques and linear optical elements, we realized the purification and concentration of unknown mixed entangled atomic states and pure non-maximally entangled atomic states respectively [8,9,10,11].Entanglement swapping is another method to realize the concentration of unknown pure non-maximally entangled states [7]. S.Bose et al have discussed the photon states case.…”

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Entanglement concentration for unknown atomic entangled states via entanglement swapping

et al. 2005

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An entanglement concentration scheme for unknown atomic entanglement states is proposed via entanglement swapping in cavity QED. Because the interaction used here is a large-detuned one between two driven atoms and a quantized cavity mode, the effects of the cavity decay and thermal field have been eliminated. These advantages can warrant the experimental feasibility of the current scheme.PACS numbers: 03.67. Hk, 03.67.Mn, 03.67.Pp In quantum teleportation, an unknown quantum state will be sent from sender to receiver via a quantum channel with the help of classical communication. In the process, the carrier of the unknown quantum information (state) is not transmitted. From the original discussion of quantum teleportation [1], a perfect quantum channel is needed if we want to teleport the quantum state faithfully, i.e. the quantum channel must be a maximally entangled state. But in real experiment, the actually available quantum channels are usually nonmaximally entangled states, such as pure non-maximally entangled states and mixed entangled states etc. To realize the faithful quantum teleportation, we must convert the non-maximally entangled states into the pure maximally entangled states. This process are usually named as entanglement concentration (pure non-maximally entangled states case) [2] and entanglement purification or distillation (mixed entangled states case) [3]. The original contribution on entanglement purification has discussed the general purification and concentration processes. The main idea of the original contribution is that, from the local operations on the ensemble of nonmaximally entangled pairs (raw entangled pairs), we will sacrifice some pairs of the raw entangled pairs and keep the remaining ones. Then entanglement of the remaining pairs will be enhanced. To realize the entanglement purification process experimentally, many physical schemes have been proposed. For mixed entangled states of polarization photons, Pan et al have presented their physical scheme [4] and experimental scheme [5], where polarization beam splitter is the most important element. J. L. Romero et al proposed a physical scheme for the purification of the mixed entangled cavity fields, where the entanglement degradation is caused by the cavity decay. To realize the purification process, two auxiliary atoms have been introduced [6]. For pure non-maximally entangled states of polarization photons, S. Bose et al have proposed a concentration scheme via entanglement swap- * Electronic address: mingyang@ahu.edu.cn † Electronic address: zlcao@ahu.edu.cn ping [7].In the previous contributions to entanglement purification and concentration, there is fewer schemes discussing the purification and concentration of entangled atomic states [8,9,10,11]. Hitherto, the purification and concentration of entangled photon states have been demonstrated in experiment [5,12,13], but the realization of purification and concentration of entangled atomic states are still under way. So it is necessary to explore the experimentally fea...

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Odd-even effect of quantum discord in the spin-1/2 Heisenberg two-leg ladder with ring exchange

Huang

Sun

Wang

2013

Phys. Status Solidi B

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The singularity of quantum correlation has been widely regarded as a valuable indicator for quantum phase transition (QPT) in low‐dimensional quantum systems. In this paper, in a two‐leg spin ladder with ring exchange, the critical points of the system cannot be detected by analyzing the singularity of the quantum discord (a kind of quantum correlation). Instead, the discord exhibits a novel odd–even effect in the symmetry‐breaking (SB) regions, which can be used to detect the two critical points between the SB regions and the non‐SB regions. The underlying mechanism of the odd–even effect is explained.

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Entanglement swapping without joint measurement

Abstract: We propose an entanglement swapping scheme in cavity QED. In the scheme, the previously used joint measurement is not needed. The entanglement swapping in our proposal is a non-post-selection one, i.e., after the swapping is done, the swapped entanglement is still there.

Cited by 92 publications

References 11 publications

Generation of pure ionic entangled states via linear optics

Generation of pure ionic entangled states via linear optics

Entanglement concentration for unknown atomic entangled states via entanglement swapping

Odd-even effect of quantum discord in the spin-1/2 Heisenberg two-leg ladder with ring exchange

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