High success standard quantum teleportation using entangled coherent state and two-level atoms in cavities

• URL: http://arxiv.org/abs/2010.06829v1
• Date: Wed, 14 Oct 2020 06:44:29 GMT
• Title: High success standard quantum teleportation using entangled coherent state and two-level atoms in cavities
• Authors: Ravi Kamal Pandey, Ranjana Prakash, and Hari Prakash
• Abstract summary: We propose a new idea for quantum teleportation of superposed coherent state which is almost perfect, in principle, and also feasible experimentally. We use entangled resource $sim |alpha,fracalphasqrt2rangle|alpha, fracalphasqrt2rangle$ in contrast with the usual $sim |alpha,alpharangle|alpha, alpha rangle$.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose here a new idea for quantum teleportation of superposed coherent state which is not only almost perfect, in principle, but also feasible experimentally. We use entangled resource $\sim |\alpha,\frac{\alpha}{\sqrt{2}}\rangle-|-\alpha,-\frac{\alpha}{\sqrt{2}}\rangle$ in contrast with the usual $\sim |\alpha,\alpha\rangle-|-\alpha,-\alpha \rangle$ (both states unnormalized). Bob receives state which is then superposition of the states $|\pm \frac{\alpha}{\sqrt{2}}\rangle$ . Bob mixes these with even or odd coherent states involving superposition of states $|\pm \frac{\alpha}{\sqrt{2}}\rangle$ to obtain a two-mode state which is one of $\sim |I,0\rangle \pm |0,I\rangle$, $|I\rangle$ being the information state. Bob then obtains the teleported information by using interaction of one of these modes in two cavities with resonant two-level atoms. This scheme results in average fidelity of $\simeq 0.95$ for $|\alpha|^2 \simeq 10$, which increases with $|\alpha|^2$ and tends to 1 asymptotically, varying as $1-\frac{\pi^2}{16|\alpha|^2}+\frac{\pi^2(\pi^2+8)}{256|\alpha|^4}$ for large values of $|\alpha|^2$.

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