Scheme for entanglement concentration of atomic entangled states in cavity QED

Liu, Ye; Guo, Guang‐Can

doi:10.1016/j.physleta.2004.05.035

Cited by 11 publications

(24 citation statements)

References 26 publications

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“…Therefore, there exist two key points herein: initial entangled pairs and entanglement swapping process. At first, the entanglement can be generally generated by performing interaction [3][4][5][6][7][8][9] or using beam splitter [10,11]. Secondly, this generated entanglement can be swapped (to the separable pairs) using Bell state measurement (BSM) [12][13][14], beam splitter [15] or via performing interaction between independent particles (QED method) [16].…”

Section: Introductionmentioning

confidence: 99%

“…As shown in this figure, we first perform entanglement swapping via appropriate interaction between trapped ions (2,3) and (6,7) in two independent OMCs. Then, by performing proper measurements (denoted by M(j, j + 1) where j = 2, 6, in figure 1) on trapped ions (2,3) and (6,7), i.e., which is done by operating appropriate projection operators, the separable trapped ions (1,4) and (5,8) are respectively converted to the entangled states. Anyway, these states can be entangled or separable depending on the time.…”

Section: Introductionmentioning

confidence: 99%

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Distributing entangled state using quantum repeater protocol: Trapped atomic ions in optomechanical cavities

Ghasemi

Tavassoly

2020

Physics Letters A

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Distribution of the entangled state of trapped atomic ions to long distance using quantum repeater protocol is considered. Indeed, the long distance is divided into short parts, and then using entanglement generation and entanglement swapping techniques in optomechanical cavities, the entanglement is distributed. To do the task, we perform interaction between trapped atomic ions in optomechanical cavities, operate proper measurements on trapped ions and also make Bell state measurement as a well-known way to swap the entanglement. Accordingly, the entanglement is distributed between target ions with satisfactory values of success probability and entanglement degree. The effects of detuning and amplitude of pump laser on the entanglement and success probability are evaluated. The fluctuations of entanglement and success probability are decreased by increasing of detuning. Via increasing the amplitude of pump laser, the maxima of entanglement are repeated more times and success probability undergoes the collapse-revival phenomenon.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distributing entangled state using quantum repeater protocol: Trapped atomic ions in optomechanical cavities

Ghasemi

Tavassoly

2020

Physics Letters A

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“…Both of which will make the fidelity of quantum teleportation degraded, quantum dense coding failed, and the quantum cryptography protocol insecure. Many schemes have been proposed to extract maximally-entangled states from non-maximally entangled states, such as entanglement concentration (for pure non-maximally entangled states) [8][9][10], entanglement purification or distillation (for mixed entangled states) [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Entanglement concentration for a non-maximally entangled four-photon cluster state

Zhang

2014

Front. Phys.

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We present a scheme for locally concentrating a non-maximally entangled four-photon cluster state into a maximally-entangled four-photon cluster state. This scheme has a high success probability. The controlled-NOT (CNOT) gate is a crucial ingredient in this scheme, and we use a nearly deterministic CNOT gate, which is similar with that first introduced by Nemoto et al. (Phys. Rev. Lett., 2004, 93: 250502). This CNOT gate has a simple structure and does not need the strong nonlinearity.

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“…There are several proposals of preparation of GHZ states. For instance, proposals involving cavity QED are presented in [12][13][14][15][16][17]. A scheme to prepare a two mode cavity EPR state and a three cavity mode GHZ state is presented in [18].…”

Section: Introductionmentioning

confidence: 99%

Realization of GHZ states and the GHZ test via the interaction of atoms with cavity field states

Guerra

2006

Journal of Modern Optics

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Scheme for entanglement concentration of atomic entangled states in cavity QED

Cited by 11 publications

References 26 publications

Distributing entangled state using quantum repeater protocol: Trapped atomic ions in optomechanical cavities

Distributing entangled state using quantum repeater protocol: Trapped atomic ions in optomechanical cavities

Entanglement concentration for a non-maximally entangled four-photon cluster state

Realization of GHZ states and the GHZ test via the interaction of atoms with cavity field states

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