Researchers at ETH Zurich in Switzerland have been working for a decade on a groundbreaking project aimed at generating true random numbers. The initiative, costing $12 million, culminated in the publication of results in Nature, highlighting a major advancement in encryption technology.

Random numbers play a crucial role in digital security. They secure digital communications by creating private keys, which consist of hundreds of zeros or ones. These numbers are fundamental to encrypting information over the internet. Conventional computers, however, struggle to produce completely random numbers due to their reliance on processes that can be predicted with the right knowledge.

Morgan W. Mitchell, a quantum physicist at the Institute of Photonic Sciences in Barcelona, describes the limitation of computers in achieving true randomness. If the processes driving these computers are understood, the outcomes can be predicted, making them vulnerable to hacking. Hackers often exploit weak randomness in encrypted systems to gain unauthorized access to private keys.

The Swiss team aimed to address this vulnerability through a technique called randomness amplification. This method enhances lower-quality random numbers using principles of quantum physics, resulting in numbers that are described by experts as “effectively perfect.” Dr. Mitchell emphasized the innovation by stating it is about placing trust in physics rather than computational power.

This achievement is considered a significant milestone in the field of quantum randomness. Dr. Roger Colbeck from King’s College London praised the research, describing it as “the most convincing demonstration” that high-quality randomness can be generated through quantum processes.