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Number state filtered coherent states

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Abstract

Number state filtering in coherent states leads to sub-Poissonian photon statistics. These states are more suitable for phase estimation when compared with the coherent states. Nonclassicality of these states is quantified in terms of the negativity of the Wigner function and the entanglement potential. Filtering of the vacuum from a coherent state is almost like the photon addition. However, filtering makes the state more resilient against dissipation than photon addition. Vacuum state filtered coherent states perform better than the photon-added coherent states for a two-way quantum key distribution protocol. A scheme to generate these states in multi-photon atom–field interaction is presented.

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Acknowledgements

One of the authors (NM) acknowledges the research fellowship from the Department of Atomic Energy, Government of India.

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  1. Materials Physics Division, Indira Gandhi Centre For Atomic Research, Homi Bhabha National Institute, Kalpakkam, 603102, India

    Nilakantha Meher & S. Sivakumar

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Correspondence to S. Sivakumar.

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Meher, N., Sivakumar, S. Number state filtered coherent states. Quantum Inf Process 17, 233 (2018). https://doi.org/10.1007/s11128-018-1995-6

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