Quantum communication and network security are two closely related fields, which will be introduced separately below:

1、 Quantum communication
Quantum communication is a new communication method based on the principles of quantum mechanics, mainly utilizing quantum superposition states and entanglement effects for information transmission. Compared to traditional communication methods, quantum communication has unique security and high efficiency.

Features:
High security: Quantum communication is based on the three principles of uncertainty, measurement collapse, and non cloning in quantum mechanics, providing absolute security guarantees that cannot be eavesdropped or cracked by calculations. The key of quantum communication is not fixed, but full of randomness, and even if the key is intercepted, it cannot be deciphered.
High efficiency: The efficiency of quantum coding is very high, not limited to the two states of "existence" and "absence", but can also be a combination of two quantum spin states. Therefore, a small amount of photons can transmit a large amount of information.

Strong anti-interference ability: Quantum communication has strong anti-interference ability, good concealment performance, and low noise ratio.



Application:
Quantum communication has been applied in many fields in China, such as the military parade commemorating the 70th anniversary of the victory of the Anti Japanese War, the 19th National Congress, and other important national conferences and events, all of which have applied quantum secure communication technology. In addition, quantum secure communication technology is also used in banking regulatory information submission, RMB cross-border payment and receipt information management system, and online banking data remote disaster recovery system.
In the latest research, Chinese scientists have designed a new quantum direct communication system that combines phase quantum state and timestamp quantum state encoding, successfully achieving a quantum direct communication distance of 100 kilometers, creating the world's longest quantum direct communication distance.

2、 Network security
Network security refers to the protection of the hardware, software, and data within a network system from accidental or malicious damage, alteration, or leakage. The system operates continuously, reliably, and normally, with uninterrupted network services.

Quantum communication is of great significance in the field of network security, mainly reflected in the following aspects:
Quantum encryption: By utilizing the properties of quantum entanglement, quantum encryption of information can be achieved, with extremely high resistance to external interference. Quantum communication utilizes the characteristics of quantum entanglement and quantum teleportation to achieve secure transmission of information.

Real time detection: Quantum communication transmits quantum states, and any measurement of quantum states can cause their state to collapse, allowing for real-time detection of whether third parties are eavesdropping or stealing communication.

Quantum key distribution: By distributing keys through quantum communication, secure information transmission can be achieved. Quantum key distribution technology utilizes properties such as quantum entanglement and non cloneibility to prevent information from being stolen and tampered with.



Quantum communication, as an emerging communication method, has unique advantages and application value in network security. By utilizing the characteristics of quantum entanglement and quantum encryption, quantum communication can achieve secure transmission of information, which is of great significance for ensuring the information security of countries, enterprises, and individuals.