MIT researchers built an electronic device that generates pairs of correlated radio frequency waves at room temperature, eliminating the need for bulky cryogenic cooling equipment. The platform, reported by MIT in Nature Electronics on August 19, 2026, allows linked microwave signals to operate on compact hardware for secure communications and high-precision sensing.
Conventional quantum microwave devices split single microwave photons into correlated pairs using Josephson junctions inside superconducting circuits. Those systems require energy-intensive cryostats to maintain temperatures below 273 degrees Celsius. The MIT team replaced those cryogenic setups by placing a magnetic film inside a microwave resonator cavity, generating synchronized signals without refrigeration.
When microwave energy enters the metal cavity, it interacts with magnons—tiny packets of magnetic energy—to form hybrid magnon-photon waves. Level repulsion between the magnons and microwave photons separates the twin signals into distinct frequencies. While each signal appears random on its own, the phase relationship between the two outputs remains tightly linked.
The researchers demonstrated the mechanism in a secure transmission test by encoding an image into the frequency of one signal. The team successfully extracted the image at the receiving end by using the partner signal as a key, confirming that eavesdroppers cannot decode the transmission without the matching wave.
The system was developed by lead author Qiuyuan Wang, senior author Luqiao Liu, and postdoc Chung-Tao Chou at MIT, alongside graduate student Aravind Karthigeyan from the University of Illinois at Urbana-Champaign. The research received funding from the National Science Foundation and the U.S. Department of Energy.
