Quantum Direct Communication

Quantum direct communication is an important branch of quantum communication, which is a kind of communication mode that transmits secret information directly without establishing a key in advance. Quantum direct communication plays an irreplaceable role in classical communication and quantum communication because of its unique advantages. Quantum direct communication can be divided into two kinds: deterministic secure quantum communication and quantum secure direct communication, both of which have high security and can guarantee the unconditional secure transmission of information in theory.