Creation and Destruction of Entanglement via Fourier Multiport Devices |
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Authors: | WU Song-An KUANG Le-Man |
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Institution: | 1.Key Laboratory of Low-Dimensional Quantum Structures and Quantum;Control of Ministry of Education, Department of Physics, Hunan Normal University, Changsha 410081, China
;2.Department of Physics, Hunan University of Science and Technology, Xiangtan 411201, China |
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Abstract: | We study entangling and disentangling functions of optical Fourier multiport devices in which input-output relation for the creation and annihilation operators is given by a finite Fourier transform. It is shown that these Fourier multiport devices can act as entanglement converters which can not only create entanglement from an unentangled state at the input but also destroyentanglement in an entangled state at the input. Creation and destruction of two-mode and three-mode entangled coherent states (ECSs) are investigated in detail. The creation and destruction of Bell-type two-mode ECS, GHZ-type and W-type three-mode ECSs are indicated explicitly through using Fourier four-port and six-port devices, respectively. |
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Keywords: | entangled coherent states entanglement converters optical Fourier multiport devices |
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