Physicists at the University of Warsaw have created the world’s first all-optical radio receiver, powered entirely by laser light and requiring no metal antennas or electrical circuits.

Developed by researchers from the Faculty of Physics and the Centre for Quantum Optical Technologies, the device uses Rydberg atoms to detect and decode radio waves, representing a major advancement in quantum sensing. The receiver is capable of self-calibration, highly accurate detection of weak signals, and invisible operation—all via laser beams. The project, led by Dr. Michał Parniak, is now being commercialized under a European Space Agency (ESA) contract.

Figure 1. Laser-Based Quantum Radio.

Traditional radio receivers rely on metal antennas and electrical mixers to capture signals. The Warsaw team replaced this setup with rubidium atoms suspended in a glass cell, illuminated by three ultra-stable lasers. As Dr. Parniak described, “We replaced the antenna and electronic mixer with a new medium – a kind of artificial aurora borealis.”

The lasers precisely match the quantum energy levels of rubidium atoms, causing electrons to enter high-energy Rydberg states [1]. When radio waves pass through the cell, they subtly alter these atomic motions. The electrons then return to lower energy levels, emitting faint infrared light that encodes the signal. Figure 1 shows Laser-Based Quantum Radio.

A key technical breakthrough was maintaining perfect synchronization between the lasers and atoms. The team used optical cavities—mirror-lined vacuum tubes that stabilize light frequency, akin to how an organ pipe sustains a musical note. This ensures steady electron motion and precise measurement of a signal’s amplitude and phase.

Unlike conventional antennas, the laser-powered receiver has no metal parts and does not disturb the radio field it measures. The system requires only rubidium vapor, lasers, and a sealed enclosure. Future miniaturization could allow the device to fit on a small optical fiber, with all light traveling through the fiber and the infrared signal returning along the opposite path. This could enable remote, non-invasive, and discreet signal detection.

Such precision could revolutionize microwave field calibration and pave the way for new applications, from stealth sensors to satellite-based quantum receivers.

The Warsaw team has been refining Rydberg-based microwave detection for years. Its combination of self-calibration, high sensitivity, and compact potential has drawn attention from international metrology institutes, defense organizations, and space agencies. Since early 2025, Dr. Parniak’s team has collaborated with the ESA to commercialize the technology for deployment on satellites, providing precision field measurements.

This research is part of Poland’s SONATA17 project and the Quantum Optical Technologies program, co-funded by the European Union.

Reference:

1. https://interestingengineering.com/innovation/laser-powered-quantum-radio-no-electricity

Cite this article:

Keerthana S (2025), New Laser-Based Quantum Radio Can Receive Signals Without Electricity or Antennas, AnaTechMaz, pp.372