Long distance cavity entanglement by entanglement swapping using atomic momenta

OPTICS COMMUNICATIONS

卷:334

Article

Ul Haq, Sami¹  Khalique, Aeysha^1,2,3,4,5 

[1] Natl Univ Sci & Technol, Sch Nat Sci, Islamabad, Pakistan

[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China

[4] Univ Sci & Technol China, Shanghai Branch, CAS Ctr Excellence, Shanghai 201315, Peoples R China

[5] Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Shanghai 201315, Peoples R China

关键词: Entanglement swapping;    External degrees of freedom;    Cavities entanglement;    Bragg diffraction;    Atomic momentum state;    Matter-wave interaction;   

DOI  :  10.1016/j.optcom.2014.08.053

来源: Elsevier

【 摘 要 】

We propose a simple technique to generate entanglement between distant cavities by using entanglement swapping involving atomic momenta. For the proposed scheme, we have two identical atoms, both initially in their ground state, each incident on far apart cavities with particular initial momenta. The two cavities are prepared initially in superposition of zero and one photon state. First, we interact each atom with a cavity in a dispersive way. The interaction results into atom-field entangled states. Then we perform EPR state measurement on both atomic momentum states which is an analog of Bell measurement. The [PR state measurement is designed by passing the atoms through cavity beam splitters which transfers the atomic momentum state into the superposition state. Finally, these atoms are detected by the detector. After the detection of the atoms, we can distinguish that cavities in one of the Bell states. This process leads to two distant cavity fields entanglement. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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