Microwave photons are the energy carriers underlying many wireless communication, radar, and sensing systems. In quantum technologies, researchers are particularly interested in producing pairs of microwave photons whose properties remain strongly connected. When two signals are correlated, measurements of one can reveal information about the other, even when each signal appears random on its own. This relationship can be exploited to distinguish a genuine signal from background noise, recover data hidden inside interference, or create communication schemes in which the intended receiver possesses information unavailable to an eavesdropper.

Until now, the most established methods for generating highly correlated microwave photons have relied on Josephson junctions, nonlinear elements found in superconducting circuits. These devices can split an incoming microwave excitation into linked quantum signals, but they must operate at temperatures only a fraction of a degree above absolute zero. Such systems are typically housed inside dilution refrigerators, specialized machines that are expensive, bulky, energy-intensive, and difficult to scale beyond laboratory environments. The temperature is far below freezing—near minus 273 degrees Celsius—rather than merely the low temperatures required by ordinary electronic equipment.

The MIT team found that a magnetic material could provide an alternative. Their device places a magnetic film inside a microwave resonator, a metal cavity designed to confine and enhance electromagnetic energy at selected frequencies. When microwave energy is pumped into the cavity, it interacts with collective excitations of the magnetic film known as magnons. A magnon is a quantized packet of spin-wave energy: instead of representing the motion of a single atom, it describes the coordinated behavior of many electron spins within a magnetic material.

In a conventional magnetic system, the nonlinear interaction driven by a microwave pump can produce pairs of magnons with the same frequency. This process creates a major practical problem. If the two excitations are spectrally identical, it is difficult to route one toward a transmitter and the other toward a receiver or detector. The MIT researchers addressed this limitation by strongly coupling the magnetic film to the microwave cavity. The resulting hybrid excitations, called magnon polaritons, combine the properties of magnons and microwave photons, allowing the paired outputs to separate into distinct frequencies.

The frequency separation arises from the interaction between the magnetic and electromagnetic modes. When two modes are coupled strongly enough, their energy levels repel one another rather than crossing directly. This phenomenon, known as level repulsion, creates two hybrid modes with different frequencies. By controlling the strength and energy of the microwave pump, the researchers were able to use this effect to separate the two members of the correlated pair while preserving their relationship. The result is a non-degenerate parametric magnon-polariton source, meaning that the linked outputs do not occupy the same microwave frequency.

Although each output can look random when examined independently, the researchers found that the phase relationship between the signals remains tightly connected. Phase describes the position of an oscillation within its cycle and is fundamental to how microwave information is encoded and detected. A receiver that measures the appropriate partner signal can use this correlation to identify patterns that would be difficult to recover from the first signal alone. The device therefore provides a physical resource for communication protocols based on correlated signals without relying on a cryogenically cooled superconducting circuit.

To demonstrate the concept, the team encoded a small image in the frequency of one microwave signal. The information-bearing signal was mixed with a partner signal and transmitted through the experimental setup. By using the correlated output, the researchers successfully decoded the hidden information and reconstructed the image. The experiment shows how a message could remain recoverable for an authorized receiver while being obscured by random fluctuations or interference. In a practical system, the matching signal could serve as a dynamically changing reference or key, although the demonstration itself does not constitute a complete deployable encryption system.

The same architecture could be useful in environments where conventional quantum hardware is impractical. Correlated microwave sources are important for quantum radar concepts, which aim to detect extremely weak reflections, and for sensing systems that compare linked signals to suppress environmental noise. They may also support hardware random-number generation, correlation-based signal processing, and microwave systems capable of identifying faint changes in a target or transmission channel. Because the magnetic device operates at room temperature, it could be integrated with conventional electronics more readily than superconducting platforms, potentially reducing the cost and complexity of future systems.

The researchers also see the platform as a possible building block for room-temperature quantum simulators. Quantum simulators are specialized systems designed to reproduce the behavior of complex quantum materials or subatomic interactions that are difficult to calculate with ordinary computers. Producing multiple correlated microwave channels on a compact chip could help researchers study nonlinear dynamics and collective excitations while exploring applications in communications and sensing. The MIT team plans to develop a more scalable architecture, investigate stronger forms of correlation, and examine whether the platform can approach regimes involving microwave entanglement. For now, the result marks a significant step beyond coherent microwave generation, showing that nonlinear cavity magnonics can produce separated, correlated signals without the extreme infrastructure normally associated with quantum microwave technology.

Subject of Research: Room-temperature generation of correlated microwave signals using cavity magnonics and hybrid magnon-photon waves

Article Title: A room-temperature cavity–magnonic source of correlated microwave magnon polariton pairs

News Publication Date: 19-Aug-2026

Web References: https://www.nature.com/articles/s41928-026-01689-y

References: Nature Electronics, DOI: 10.1038/s41928-026-01689-y

Keywords: Quantum technologies, correlated microwave photons, cavity magnonics, magnon polaritons, magnons, microwave communications, secure communications, quantum radar, quantum sensing, room-temperature electronics, nonlinear dynamics, magnetic films, microwave resonators, spintronics

Leading this mission is Dimitris Pados, Ph.D., principal investigator and director of FAU’s Center for Connected Autonomy and Artificial Intelligence (CA-AI), alongside George Sklivanitis, Ph.D., co-investigator and research associate professor. Thanks to a $2.1 million grant awarded by the U.S. Department of Defense Air Force Research Laboratory (AFRL), these experts are establishing the FAU Center of Excellence for Research and Education in Programmable Wireless Networks. This center is poised to serve as a dynamic hub for the development of next-generation technologies designed to secure spectrum dominance against escalating electronic warfare threats.

At the heart of this endeavor lies a transformative vision: to shift away from outdated, rigid, and vendor-specific "hard-wired" communication infrastructures that currently constrain the military’s operational agility. Conventional systems, often bound to static architectures and limited by scarce hardware adaptability, lack the flexibility needed to contend with the multifaceted demands of modern warfare. In contrast, the new paradigm champions software-defined, programmable wireless networks capable of real-time cognitive decision-making — autonomously sensing and mitigating interference while optimizing channel utilization across complex multi-node networks.

This shift is not merely technical but strategic, ensuring the armed forces can navigate an electromagnetic battlespace increasingly contested by jamming, spoofing, and signal interception. According to Pados, "Future military operations will exist in environments where the EMS is relentlessly contested, making uninterrupted communication, radar detection, and GPS navigation profoundly challenging." Thus, the FAU center’s focus on dynamic spectrum management aims to create robust waveforms, adaptive modulation schemes, and intelligent control algorithms that minimize vulnerability and maximize spectral efficiency.

Technologically, the center’s agenda unfolds across three integral pillars. First, researchers are developing sophisticated algorithms that facilitate autonomous spectrum operations, enabling devices to detect interference, coordinate use of channels, and adjust transmission parameters with minimal human intervention. These cognitive radios will be equipped with machine learning frameworks that allow continuous self-optimization, ensuring resilience in the face of electronic attacks.

Second, the center prioritizes hardware innovations designed to integrate seamlessly with these agile algorithms. This includes the development of high-performance processors, Graphical Processing Units (GPUs), and Field Programmable Gate Arrays (FPGAs) that serve as the computational backbone for software-defined radio platforms. Such hardware can swiftly reconfigure operational parameters, empowering networks to adapt across domains including terrestrial, aerial, maritime, and even underwater theaters, where electromagnetic conditions and threats vary dramatically.

The final pillar emphasizes comprehensive workforce development, recognizing that technology is only as effective as the people who build and operate it. FAU’s educational programs span from high school outreach through doctoral-level research, cultivating a new generation of engineers and computer scientists skilled in cutting-edge communications technologies and spectrum warfare techniques. This educational component is vital, as the defense sector faces a critical shortage of professionals trained in dynamic spectrum engineering and cyber-electronic warfare.

Collaborative partnerships underpin the center’s success, with FAU joining forces with the University at Buffalo, State University of New York, to combine expertise in electrical engineering and network science. This alliance envisions synergistic advancements that empower both research innovation and curriculum development, ensuring that emerging solutions translate effectively to operational use.

Beyond tactical communications, the center’s research has broader implications for national security systems reliant on electromagnetic spectrum access. Radar operations fundamental to threat detection and missile guidance, GPS-dependent navigation critical to mission execution, and satellite communication architectures all stand to benefit from enhanced spectral control. The capability to dynamically manage these systems under contested conditions can mean the difference between mission success and failure.

Moreover, the strategic focus on programmability reflects a broader trend in communications technology evolution — moving from fixed-functionality hardware toward flexible, software-driven networks that harness artificial intelligence for autonomous management. This approach not only counters adversarial disruption but also accelerates deployment cycles, enabling rapid updates and scaling as new threats emerge.

FAU’s leadership, including Stella Batalama, Ph.D., dean of the College of Engineering and Computer Science, underscores the urgency of staying ahead in this electromagnetic arms race. As nation-states escalate their electronic warfare capabilities, the development of resilient, agile spectrum systems is imperative. “This center is crucial because it will enable the United States to maintain unchallenged control of the electromagnetic spectrum, preventing adversaries from gaining any advantage in communications, navigation, or radar systems,” Batalama remarked.

Aligned closely with the Department of Defense’s strategic priorities, the FAU Center of Excellence represents a pivotal advance in transforming legacy spectrum operations. By fostering a research ecosystem that seamlessly integrates advanced algorithms, reconfigurable hardware, and skilled human capital, this initiative promises to redefine how military forces communicate and operate in contested and denied spectral environments.

As the electromagnetic battlefield continues to evolve, the ability to command the spectrum with precision, adaptability, and resilience will be an essential pillar of national defense. The work underway at FAU stands at the forefront of this critical technological revolution, heralding a new era where programmable wireless networks provide the foundation for securing victory in the invisible wars of tomorrow.

Subject of Research: Electromagnetic Spectrum Operations, Programmable Wireless Networks, Secure Military Communications

Article Title: Florida Atlantic University Establishes Center of Excellence to Revolutionize Military Spectrum Warfare

News Publication Date: Information not provided

Web References:

• Center for Connected Autonomy and Artificial Intelligence: https://ca-ai.fau.edu
• Florida Atlantic University College of Engineering and Computer Science: https://eng.fau.edu
• Florida Atlantic University: http://www.fau.edu

Image Credits: Alex Dolce, Florida Atlantic University

Keywords: Remote sensing, Navigation, Network science, Technology, Military technology, Sensors, Telecommunications, Satellite communications, Laser systems, Information technology, Network structure