Quantum communication, also known as quantum teleportation, refers to a process without trace. Quantum communication is a kind of communication mode which is carried by the quantum state. It uses the principle of quantum entanglement of the elementary particles, such as photons, to realize the secure communication.



Quantum communication is a new way of communication, it is no longer the classical information but the quantum information carried by quantum states.



According to common sense, the dissemination of information needs a carrier, and quantum communication is not the carrier of information transmission. From the angle of physics, you can imagine the teleportation: first extract all information of the original, and then transmit the information to the receiving location, receiver based on these information, the selection and the basic unit of identical (such as atomic) create a copy of the original material, perfect.



Quantum teleportation is quantum information, which is the basic process of quantum communication. Based on this process, people put forward the idea of realizing quantum internet. Quantum Internet is a kind of quantum processor that can be used to communicate and process quantum information. Compared with the classical Internet, quantum Internet has the characteristics of security and confidentiality, which can realize the multi terminal distributed computing and effectively reduce the communication complexity.



Quantum communication is a rising interdisciplinary field of classical information theory and quantum mechanics combined, compared with the mature communication technique, quantum communication has great superiority, has the characteristics of high security, large capacity and long-distance transmission, is a hot research topic in the twenty-first Century International Quantum Physics and information science.