**3. Quantum revolution with quantum computing and communication**

Among these, some quantum computing and communication technologies are available for use; for example, quantum computer, quantum cryptography, teleportation, and quantum error correction. Quantum computer is the physical platform that realizes quantum computing to encode qubits so that different qubits can be coupled in a controllable manner and have a certain resistance to the influence of the noise environment. The main quantum computer solutions currently developed include superconductivity, ion traps, quantum dots, topologies, and diamond color centers. Quantum cryptography can take advantage of quantum states to enable classical information to be transmitted securely. Teleportation achieves reliable

*Introductory Chapter: Quantum Computing and Communications DOI: http://dx.doi.org/10.5772/intechopen.102478*

transmission of quantum states by using entanglement. Quantum error correction keeps the possibility of maintaining quantum coherence when an irreversible noise process exists.

At present, the world is undergoing a new round of "quantum revolution". Quantum computing and communication technologies are accelerating breakthroughs in key technologies. In the new stage, some technologies are gradually being integrated with the system. Breakthroughs have been made in key technologies, such as integration, engineering, and networking. The integration of quantum communication with classical communication networks, multi-bit operation, and computing of quantum computers show the application prospects of quantum information in the industry.
