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Superdense Coding Protocol in Maximally and Non- Maximally Entangled Bell state: An Experimental Realisation

Rangan Chakrabarty, Arpan Purkait

Published Mar 29, 2026• 0 citations
Publisher
DOI
10.13140/rg.2.2.22746.91843

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Theoretical and Natural Science•Sep 15, 2026•0 citations
We show that with the fourpartite quantum channel used to teleport an arbitrary two qubit state, we can construct a superdense coding protocol where it is possible to transmit 4 bits of classical information sending only 2 qubits. Alice and Bob initially share a four qubit maximally entangled state and by locally manipulating her two qubits Alice can generate 16 orthogonal maximally entangled states, which are used to encode the message transmitted to Bob. He reads the 4 bit message by a generalized Bell state measurement. A generalized protocol in which 2N bits of classical information is transmitted via N qubits is also presented. We also show that this four(2N-)partite channel is equivalent to two(N) Bell states, which proves that we need two(N) Bell states to teleport a two(N) qubit system.
This paper investigates two distinct protocols and one combined protocol for image teleportation based on three quantum states. It begins by reviewing key linear algebraic concepts and formalized quantum states in Hilbert space. Building on this, it analyzes a variation of dense coding using non-maximally entangled (polluted) states. It demonstrates that while full distinguishability of four Bell-like states is lost under entanglement degradation, it is possible to design a restricted set of operations that maximizes distinguishability; it designs a new protocol of superdense coding based on three Bell states. In the next section of the article, it introduces a three-level energy system and designs a quantum teleportation protocol based on the three states. It also introduces the HSV color model, which features three parameters that are used to represent a color. With such a protocol, it can teleport a color with high confidence and security. Both of these protocols can be used for image teleportation technologies. Finally, it integrates the superdense coding protocol and the quantum teleportation protocol to create a highly theoretical image teleportation protocol that can perform filtering, encoding and decoding, and emergency destruction on colored images with enhanced security. An additional participant is added, so that the quantum state will be modified during the teleportation process by this new participant. All of these protocols can be applied in future image teleportation techniques.