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The E91 protocol is a QKD scheme based on quantum entanglement, developed by Artur Ekert in 1991. It relies on the violation of Bell's inequalities to ensure the security of the key distribution and can detect the presence of an eavesdropper on the communication channel.

Quantum coherence refers to the property of quantum states whereby they exhibit clear phase relationships. It is a fundamental principle required for quantum communication, as maintaining coherence is necessary to transmit and process quantum information.

Quantum entanglement is a physical phenomenon that occurs when pairs or groups of particles interact in such a way that the quantum state of each particle cannot be described independently of the state of the others, even when the particles are separated by a large distance. It's pivotal in quantum communication for tasks like quantum teleportation and superdense coding.

Quantum network protocols are rules and algorithms designed to control the transfer of quantum information in a quantum network. They deal with aspects such as routing, error correction, and security, and are essential for creating an efficient and robust Quantum Internet.

The No-Cloning Theorem states that it is impossible to create an identical copy of an arbitrary unknown quantum state. This theorem is crucial for the security of quantum communication, as it ensures that a quantum message cannot be intercepted and perfectly copied without detection.

Quantum repeaters are devices used to extend the range of quantum communication channels. They work by entangling qubits at intermediate points along a communication channel, facilitating long-distance quantum communication without significant loss of fidelity.

Quantum error correction involves methods to protect quantum information from errors due to decoherence and other quantum noise. Quantum error-correcting codes are vital for the realization of reliable quantum communication and quantum computing systems.

QKD is a secure communication method that uses quantum mechanics to produce and share a random secret key known only to the communicating parties. It can detect eavesdroppers because any attempt to intercept the key changes its state. The security of QKD is grounded in the principles of quantum mechanics, not computational complexity.

Quantum teleportation is a technique for transferring quantum information from a sender to a receiver at a distant location without sending the physical system carrying the information. It utilizes entangled particles and classical communication. This concept is fundamental for remote quantum communications.

Quantum cryptography refers to the use of quantum mechanical properties to perform cryptographic tasks or to break cryptographic systems. Its most famous application is QKD which allows secure distribution of encryption keys.

BB84 is one of the first and most well-known QKD protocols. It uses the polarization states of photons to encode and communicate a secret key. The protocol includes checks for eavesdropping and guarantees secure communication assuming perfect quantum channels and genuine quantum devices.

Bell Test experiments are designed to demonstrate the phenomenon of entanglement and to test the validity of Bell's inequalities. These experiments are significant in quantum mechanics and quantum communication because they confirm non-classical correlations between entangled particles.

A quantum channel is a communication medium that carries quantum information, often in the form of qubits. The security and fidelity of quantum communication rely heavily on the properties of the quantum channel used.

Superdense coding is a quantum communication protocol that allows the transmission of two bits of classical information by sending only one qubit. It relies on the pre-shared entanglement between the communicating parties. Superdense coding demonstrates the potential for bandwidth efficiency in quantum communication.