https://doi.org/10.1140/epjp/s13360-022-03442-8
Regular Article
Generation of maximally entangled N-photon field W-states via cavity QED
1
Department of Physics, University of Malakand Chakdara, Dir Lower, Khyber Pakhtunkhwa, Pakistan
2
Department of Physics, Government Degree College, Lund Khwar Mardan, Khyber Pakhtunkhwa, Pakistan
3
National Institute of Lasers and Optronics College, Pakistan Institute of Engineering and Applied Sciences, 45650, Nilore, Islamabad, Pakistan
4
Center for Computational Material Sciences, University of Malakand Chakdara, Dir Lower, Khyber Pakhtunkhwa, Pakistan
5
Department of Physics, Gomal University, Dera Ismail Khan, Pakistan
Received:
25
February
2022
Accepted:
29
October
2022
Published online:
12
November
2022
We propose a novel scheme to engineer maximally entangled four qubits N-photon field W-states through cavity QED technique. The scheme is based on the atomic analogue of Mach–Zehnder interferometer, which consists of high-Q cavities carrying quantized field superposition and serve as atomic beam splitters and atomic mirrors. Here, a stream of two level neutral atoms is diffracted through these atomic beam splitters to produce well separated quantized atomic momenta components under off-resonant atomic Bragg diffraction (ABD). While traversing the setup, these split atomic wave packets are excited from their ground to excited states through classical laser beams. Later they interact resonantly with the initially vacuum state high-Q cavities fitted along their respective paths. Such interactions, governed by simple external momenta free Hamiltonian, impart a photon to each cavity during each 
-Rabi cycle of the interaction. Finally, these atomic momenta components are passed through the specifically engineered atomic beam splitters either through utilization of Fock field cavities or counter propagating laser beams to erase the path information carried by the split atomic wavepackets. This information eraser is stringently required for engineering of desired field entangled W-states. It is further shown that the generation probability of such states may turn out closer to unity with high fidelity in optimal laboratory conditions.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
