ETH Zurich researchers linked two qubits over 30 meters to create a certified randomness stream, according to Nature. The groundbreaking study, led by Renato Renner, reveals practical implications for cryptography and security systems as it challenges deterministic views of reality.
What happened
Inside a 30-meter tunnel in Zurich, researchers from ETH Zurich employed quantum entanglement to generate an unprecedented stream of randomness. This system used two qubits that communicated through microwave photons, producing outputs that defy prediction. “The randomness is certified by the experiment’s structure and quantum theory itself,” Renner stated.
The study, published in Nature, asserts that unpredictability is a fundamental feature of the universe, rather than a limitation of measurement tools. “Scientists have long asked if that irreducible chaos can be harvested to produce pure randomness. Our evidence shows that it can,” Renner added.
Why it matters
This breakthrough redefines the concept of randomness, which has direct implications for cryptography. The integrity of secure transactions relies on unpredictability; thus, this quantum method offers a new layer of security that traditional methods cannot match. Banks, cloud providers, and security modules could integrate these certified bits into various applications.
Background
On prior occasions, researchers have attempted to harness quantum mechanics for practical uses, but those methods were less reliable. This development builds on decades of Bell test research, which rules out hidden classical variables that could compromise randomness. The ETH Zurich team claims their findings establish a “perfect die” that generates outputs no one can predict.
What’s next
The ETH Zurich team is working on scaling their technology for broader applications, particularly in cryptography and secure communications. Future studies and developments are anticipated before the end of 2026, as the implications of this research continue to unfold.
