Entanglement swapping to a qutrit-qutrit atomic system in the presence of Kerr medium and detuning parameter

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.

Section: Introductionmentioning

confidence: 99%

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

2020

Physics Letters A

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“…The entanglement between the separated parts can be produced using the beam splitter [5][6][7][8]. In another way, entanglement of these produced entangled states can be swapped by Bell state measurement (BSM) method [9][10][11] and performing interaction [12][13][14]. The quantum repeater protocol has been extended the distance of communication to the order of km (10 3 ∼ 10 6 km) [15].…”

Section: Introductionmentioning

confidence: 99%

Toward a quantum repeater protocol based on the coherent state approach

2019

Laser Phys.

The aim of this paper is to swap the entanglement between two separate long distant locations. The well-known entangled coherent states as two-mode continuous-variable states are very interesting in quantum teleportation and entanglement swapping processes. To make our investigation more realistic, by using such entangled states as the building block of our quantum repeater protocol, the effect of decoherence on the swapped entanglement is also considered. We explicitly establish our model for four locations, moreover, we find that our model can be extended to 2 N locations, where N = 3, 4, • • • . Consequently, we could introduce this model as a quantum repeater which is helpful for entanglement swapping to enough long distances.

“…In this protocol a long distance is divided to several short parts and entanglement is transferred by entanglement swapping process. The entanglement can be swapped by using Bell state measurement (BSM) [13][14][15][16] and also via performing interaction between separable parts of the considered system [17,18]. The quantum electrodynamics (QED) method is indeed more complicated than the BSM, at least from the theoretical point of view.…”

Section: Introductionmentioning

confidence: 99%

Quantum repeater protocol using an arrangement of QED–optomechanical hybrid systems

2019

J. Opt. Soc. Am. B

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In this paper we consider the quantum repeater protocol for distributing the entanglement to two distant three-level atoms. In this protocol, we insert six atoms between two target atoms such that the eight considered atoms are labeled by 1, 2, • • • 8, while only each two adjacent atoms (i, i + 1) with i = 1, 3, 5, 7 are entangled. Initially, the separable atomic pair states (1,4) and (5,8) become entangled by performing interaction between atoms (2,3) and (6,7) in two optomechanical cavities, respectively. Then, via performing appropriate interaction between atoms (4,5) in an optical cavity quantum electrodynamics (QED) approach, the target atoms (1,8) are finally become entangled. Throughout this investigation, the effects of mechanical frequency and optomechanical coupling strength to the field modes on the produced entanglement and the related success probability are evaluated. It is shown that, the time period of produced entanglement can be developed by increasing the mechanical frequency. Also, maximum of success probability of atoms (1,8) is increased by decreasing the optomechanical coupling strength to the field modes in most cases.