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Qubit movement-assisted entanglement swapping |
| Sare Golkar1, Mohammad Kazem Tavassoly1,2, Alireza Nourmandipour3 |
1 Atomic and Molecular Group, Faculty of Physics, Yazd University, Yazd 89195-741, Iran;
2 Photonic Research Group, Engineering Research Center, Yazd University, Yazd 89195-741, Iran;
3 Department of Physics, Faculty of Science, Sirjan University of Technology, Sirjan, Iran |
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Abstract We propose a scheme to generate entanglement between two distant qubits (two-level atom) which are separately trapped in their own (in general) non-Markovian dissipative cavities by utilizing entangling swapping, considering the case in which the qubits can move along their cavity axes rather than a static state of motion. We first examine the role of movement of the qubit by studying the entropy evolution for each subsystem. The average entropy over the initial states of the qubit is calculated. Then by performing a Bell state measurement on the fields leaving the cavities, we swap the entanglement between qubit-field in each cavity into qubit-qubit and field-field subsystems. The entangling power is used to measure the average amount of swapped entanglement over all possible pure initial states. Our results are presented in two weak and strong coupling regimes, illustrating the positive role of movement of the qubits on the swapped entanglement. It is revealed that by considering certain conditions for the initial state of qubits, it is possible to achieve a maximally long-leaving stationary entanglement (Bell state) which is entirely independent of the environmental variables as well as the velocity of qubits. This happens when the two qubits have the same velocities.
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Received: 23 January 2020
Revised: 19 February 2020
Accepted manuscript online:
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PACS:
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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03.67.Mn
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(Entanglement measures, witnesses, and other characterizations)
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Corresponding Authors:
Alireza Nourmandipour
E-mail: anourmandip@sirjantech.ac.ir,anourmandip@gmail.com
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Cite this article:
Sare Golkar, Mohammad Kazem Tavassoly, Alireza Nourmandipour Qubit movement-assisted entanglement swapping 2020 Chin. Phys. B 29 050304
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