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Quantum Randomness Amplification Breaks Santha-Vazirani Limit, Achieves Device-Independent Certified Perfect Randomness

Target:UPSC GS-IIIMPSCTeachingSSC GAPrelims HighMains Medium
09 Jun 2026
~2 min
Source: The Hindu
Key Data:Bell Test Score 2.271Quantum Max Score 2.82Failure Probability 1 in a trillionDistance 30 metersInput Bits 5.3 billionOutput Rate 1,400 bits/sec
Bodies:ETH ZürichRaman Research Institute
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What This Article Covers

1.Researchers at ETH Zürich published in Nature a technique using quantum entanglement (Bell test) to amplify weakly random bits into certified perfect randomness.

2.The experiment breaks the Santha-Vazirani limit (1986), proving quantum physics can overcome a classical impossibility.

3.The protocol is device-independent, achieving a failure probability of one in a trillion, but is currently slower and less efficient than commercial RNGs.

The Big Picture
Prelims · HighMains · Medium

A landmark quantum physics experiment at ETH Zürich has demonstrated 'randomness amplification', turning predictable data into certified perfect randomness and breaking a classical impossibility theorem. This device-independent method is a breakthrough for cryptographic security, with potential applications in public randomness beacons.

Exam Lens

Quick Exam Facts From News

Published JournalNature
Key InstitutionETH Zürich
Bell Test Score2.271 (Classical limit is 2)
Quantum Maximum Score2.82
Failure ProbabilityOne in a trillion
Experiment Distance30 meters
Input Bits Used5.3 billion biased bits
Output Rate1,400 bits/second
Year of Santha-Vazirani Limit1986

1-Minute Revision

  • ›Published Journal: Nature
  • ›Key Institution: ETH Zürich
  • ›Target this Institution: ETH Zürich (Swiss Federal Institute of Technology)
  • ›Target this Theorem: Santha-Vazirani Limit (1986)
  • ›Target this Data: Bell Test Score of 2.271 (Classical limit is 2)
  • ›Target this Application: Public Randomness Beacon (like NIST's service)

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Practice exam-style questions, track your score, and strengthen your recall.

Q1Static LinkageEasy

The research demonstrating randomness amplification was published in which scientific journal?

Q2Statement-basedHard

Consider the following statements regarding the quantum randomness amplification breakthrough:

1. The experiment successfully broke the Santha-Vazirani limit, which states that classical computers cannot upgrade a weakly random source into a perfectly random one.

2. The protocol achieved a Bell test score of 2.271, which is below the classical limit of 2, indicating the process was not purely quantum.

3. The technique is device-independent, meaning the output's randomness can be certified even if the hardware generating it is not trusted.

Which of the statements given above is/are correct?

Q3Data-centricMedium

According to the experiment described, what was the distance between the two entangled particles in the Bell test setup?

Q4Application/ImpactMedium

What is a proposed primary application for the certified random bits generated by the new quantum amplification protocol?

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