In general, quantum communication involves encoding and transmitting messages using different configurations of subatomic particles and their physical parameters. In the full configuration of quantum communication, we transmit qubits instead of classical bits. Current methods of communication of this type use the transmission of photons and their encoded quantum states. This approach and the concept of quantum communication itself enable a completely new approach to the idea of communication, and it is a way to transmit qubits between quantum computing infrastructures, which makes it possible to scale such a computing infrastructure.
The realization of the concept of quantum communication requires, among other things, the development of key methods for efficient generation of pairs of entangled photons, their distribution over longer distances which requires the development of so-called quantum regenerators. A key component of such a regenerator is the so-called quantum memory. Quantum communication offers potentially many new applications, but one of the main and first proposed such applications is the mentioned secure data transmission where using principles studied by quantum mechanics we offer the integrity of the transmitted signal, data and services. One of the proposed such methods is the so-called quantum key distribution.