**5.1 A new theoretical model of high-temperature superconductivity may lead to extremely efficient energy generation and transmission**

It is known that a superconductor permits the flow of current without resistance. The conventional way of thinking about the transition from normal to superconducting is called the Bardeen-Cooper-Schrieffer (BCS) theory. But last year, H. Koizumi, a researcher at Tsukuba University has announced a new theoretical model of hightemperature superconductivity, which may lead to extremely efficient energy generation and transmission. Instead of focusing on the pairing of charged particles, this new theory uses the mathematical tool called the Berry connection. This value computes a twisting of space where electrons travel. In the standard BCS theory, the origin of superconductivity is electron pairing. In this new theory, the supercurrent is identified as the dissipation less flow of the paired electrons [35]. We will discuss later; we may come up with an alternative method of quantum communication based on such Berry connection.
