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Generation of atomic momentum cluster and graph states via cavity QED

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Abstract

We present an experimentally feasible method, based on currently available cavity QED technology, to generate n-partite linear cluster and graph states in external degree of freedom of atoms. The scheme is based on first tagging n two-level atoms with the respective cavity fields in momentum space. Later on an effective Ising interaction between such tagged atoms, realized through consecutive resonant and dispersive interactions of auxiliary atoms with the remanent cavity fields, can generate the desired atomic momenta states. The procedure is completed when the auxiliary atoms after passing through Ramsey zones are detected in either of their internal states. We also briefly explain the generation of weighted graph states in the atomic external degree of freedom.

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Authors and Affiliations

  1. National Institute of Lasers and Optronics, Nilore, Islamabad, Pakistan

    Rameez-ul Islam

  2. Centre for Quantum Physics, COMSATS Institute of Information Technology, Islamabad, Pakistan

    Ashfaq H. Khosa

  3. Department of Electronics, Quaid-i-Azam University, Islamabad, Pakistan

    Farhan Saif

  4. Department of Physics and Astronomy, CUNY Hunter College, 695 Park Avenue, New York, NY, 10021, USA

    János A. Bergou

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  1. Rameez-ul Islam
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  2. Ashfaq H. Khosa
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Correspondence to Ashfaq H. Khosa.

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Islam, Ru., Khosa, A.H., Saif, F. et al. Generation of atomic momentum cluster and graph states via cavity QED. Quantum Inf Process 12, 129–148 (2013). https://doi.org/10.1007/s11128-012-0359-x

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