Quantum information is a field that studies how information is processed and stored using quantum systems. It relates to QFT because it uses the principles of quantum mechanics to understand and manipulate information in quantum systems.
Some recommended readings include "Quantum Field Theory and the Standard Model" by Matthew D. Schwartz, "Quantum Field Theory for the Gifted Amateur" by Tom Lancaster and Stephen J. Blundell, and "Quantum Field Theory and the Jones Polynomial" by Louis H. Kauffman.
Quantum information provides a new perspective on QFT by showing how information can be encoded and manipulated in quantum systems. It also helps to explain some of the counterintuitive phenomena observed in QFT, such as entanglement and superposition.
Yes, there are practical applications of quantum information in QFT, such as quantum error correction, quantum cryptography, and quantum computing. These applications have the potential to greatly improve our ability to understand and use QFT in various fields.
Some current developments include the use of quantum information to study black holes and quantum gravity, as well as the development of new quantum algorithms for solving problems in QFT. There is also ongoing research on the relationship between quantum information and quantum field theories in higher dimensions.