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Quantum entanglement is a unique criterion of the quantum realm and anessential tool to secure quantum communication. Ensuring high-fidelityentanglement has always been a challenging task owing to interaction with thehostile channel environment created due to quantum noise and decoherence.Though several methods have been proposed, achieving almost 100% errorcorrection is still a gigantic task. As one of the main contributions of thiswork, a new model for large distance communication has been introduced, whichcan correct all bit flip errors or other errors quite extensively if properencoding is used. To achieve this purpose, at the very first step, the idea ofdifferentiating the long and short-distance applications has been introduced.Short-distance is determined by the maximum range of applying unitary controlgates by the qubit technology. As far as we know, there is no previous workthat distinguishes long and short distance applications. At the beginning, wehave applied stabilizer formalism and Repetition Code for decoding todistinguish the error correcting ability in long and short distancecommunication. Particularly for short distance communication, it has beendemonstrated that a properly encoded bell state can identify all the bit flip,or phase flip errors with 100% accuracy theoretically. In contrast, if the bellstates are used in long distance communication, the error-detecting andcorrecting ability reduces at huge amounts. To increase the fidelitysignificantly and correct the errors quite extensively for long-distancecommunication, a new model based on classical communication protocol has beenproposed. All the required circuits in these processes have been generalizedduring encoding. Proposed analytical results have also been verified with theSimulation results of IBM QISKIT QASM.

Immense Fidelity Enhancement of Encoded Quantum Bell Pairs at Short and Long-distance Communication along with Generalized Design of Circuit