Fast Facts
- ETH Zurich used quantum entanglement to produce certifiably perfect, unpredictable randomness.
- The experiment involved entangled qubits separated by 30 meters, cooled near absolute zero.
- This method amplifies imperfect randomness into perfectly unpredictable output, unlike classical systems.
- The system is device-independent, ensuring long-term, eternally secure randomness for technological use.
Achieving True, Unpredictable Randomness Through Quantum Physics
Generating real randomness has always been a challenge in physics. Traditional methods, like rolling dice or flipping coins, are affected by flaws or forces that could theoretically be predicted. Computer algorithms also generate pseudo-random numbers, which are deterministic and can be guessed. Even hardware-based generators can produce predictable results due to flaws in design. The main issue is proving that the output can’t be predicted by any hidden rules.
Recently, a team of physicists at ETH Zurich made a breakthrough. They used a quantum phenomenon called entanglement to create perfect randomness. They set up two quantum bits, or qubits, separated by 30 meters and cooled close to absolute zero. Measuring these entangled particles produced correlations so strong that they couldn’t be explained by classical physics. The team performed over a billion Bell-test trials in nine hours. This proved that their randomness was truly unpredictable and certifiable.
Their achievement is called randomness amplification. Unlike previous methods, it starts with imperfect randomness—possibly biased or flawed—and transforms it into perfect, certifiable randomness. This process cannot be achieved by classical means alone. The resulting system produces random numbers that remain forever unpredictable, regardless of later analysis. Because it’s device independent, it depends on the quantum behavior observed, not trusted hardware.
This advance has major implications for security. Perfect randomness is critical for passwords, encryption keys, and secure communications. The team envisions their system as a new standard for generating trustworthy, physically certified randomness, much like how atomic clocks now set the standard for timekeeping.
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