In recent years, quantum computers, which handle information based on a completely different concept than conventional computers, have been attracting attention. Quantum bits are used in quantum networks to simultaneously solve a large number of solution patterns using quantum states in which a large number of states are superimposed, thereby enabling problems such as combinatorial optimization problems, which take an enormous amount of time with conventional computers, to be solved in a fraction of a second. This allows problems such as combinatorial optimization problems to be solved in a fraction of a second, which would take an enormous amount of time with conventional computers.

However, since it is difficult to scale up quantum computing devices, it is effective to realize a large quantum computing device as a whole by connecting many quantum computing devices that exist in remote locations. A quantum network connects multiple remote quantum computing devices and propagates qubits while maintaining the state of quantum superposition. Since there are various restrictions on the transmission of EPR pairs, there are many problems to be solved in order to realize a quantum network.

Therefore, from FY2024, we are newly working on control techniques for efficient and low-cost quantum communication using EPR pairs.