Technologies involved in quantum communication include quantum key distribution (QKD), quantum entanglement, and superposition. QKD enables secure communication by utilizing the principles of quantum mechanics to allow two parties to share a secret key securely. This method detects any eavesdropping since observing a quantum system changes its state. Additionally, technologies such as photonic systems and quantum repeaters are also crucial for transmitting quantum information over long distances, enhancing the integrity and security of messages exchanged.