MIT develops device for direct quantum processor communication

MIT researchers have developed a new device that allows multiple quantum processors to communicate directly with each other. This technology enables all-to-all communication, meaning each processor can send and receive quantum information as needed. The researchers demonstrated this interconnect using two quantum processors. They were able to send microwave photons, which are particles of light that carry quantum information, back and forth. The device uses a waveguide, or superconducting wire, that connects the processors and allows them to communicate over longer distances. This interconnect is significant because it allows for something called remote entanglement. Remote entanglement is when two processors become correlated, even if they are physically separated. This is a crucial step toward building a robust network of quantum processors. Current systems have limitations because they rely on point-to-point connections, which can introduce errors. The new all-to-all communication system enhances flexibility and increases the efficiency of transmitting information between connected processors. To achieve remote entanglement, researchers carefully controlled the emission of photons. They developed a method to optimize how photons are sent and absorbed, achieving an absorption efficiency greater than 60 percent. This efficiency level is important for creating a reliable quantum connection. Looking ahead, the team believes their technology can be expanded to include more quantum modules and could help in building a larger quantum internet. Future developments may involve improving photon pathways and making the system faster to reduce potential errors. This research was funded by various U.S. organizations interested in advancing quantum technology.