Quantum secure encryption refers to cryptographic techniques that are designed to resist attacks from quantum computers. Quantum computers have the potential to break many of the commonly used encryption algorithms today, such as RSA and ECC, due to their ability to perform calculations at a much faster rate than classical computers. Quantum secure encryption aims to ensure that data remains confidential and secure even in the presence of powerful quantum computers.

One of the most promising approaches to quantum secure encryption is the use of quantum-resistant algorithms, which are designed to withstand attacks from both classical and quantum computers. These algorithms are based on mathematical problems that are believed to be hard for quantum computers to solve efficiently. Examples of quantum-resistant algorithms include lattice-based cryptography, code-based cryptography, and multivariate polynomial cryptography.

Another approach to quantum secure encryption is the development of quantum key distribution (QKD) protocols, such as the BB84 protocol and the E91 protocol. QKD allows two parties to establish a shared secret key with unconditional security, meaning that the security of the key is guaranteed by the laws of quantum physics. By combining quantum-resistant algorithms with QKD protocols, it is possible to achieve a high level of security against both classical and quantum attacks.