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Related Concept Videos

Propagation of Uncertainty from Random Error00:59

Propagation of Uncertainty from Random Error

An experiment often consists of more than a single step. In this case, measurements at each step give rise to uncertainty. Because the measurements occur in successive steps, the uncertainty in one step necessarily contributes to that in the subsequent step. As we perform statistical analysis on these types of experiments, we must learn to account for the propagation of uncertainty from one step to the next. The propagation of uncertainty depends on the type of arithmetic operation performed on...
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The atomic mass of an element varies due to the relative ratio of its isotopes. A sample's relative proportion of oxygen isotopes influences its average atomic mass. For instance, if we were to measure the atomic mass of oxygen from a sample, the mass would be a weighted average of the isotopic masses of oxygen in that sample. Since a single sample is not likely to perfectly reflect the true atomic mass of oxygen for all the molecules of oxygen on Earth, the mass we obtain from this particular...
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Wald-Wolfowitz Runs Test II01:17

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Related Experiment Video

Updated: May 31, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Certified quantum randomness within purity constraints.

Xing Lin1,2,3, Rong Wang1,2,3,4, Zhen-Qiang Yin1,3

  • 1Laboratory of Quantum Information, University of Science and Technology of China, Hefei, China.

Science Advances
|May 29, 2026
PubMed
Summary
This summary is machine-generated.

We developed a new semi-device-independent quantum random number generator (QRNG) that ensures security despite device imperfections. This method enhances randomness extraction for secure quantum technologies.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Last Updated: May 31, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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Published on: May 30, 2014

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Area of Science:

  • Quantum Information Science
  • Quantum Cryptography
  • Quantum Optics

Background:

  • Practical quantum random number generators (QRNGs) face security vulnerabilities due to device imperfections.
  • Existing QRNG protocols often require detailed device characterization, limiting their applicability.

Purpose of the Study:

  • To propose a semi-device-independent QRNG protocol that enhances security against device imperfections.
  • To establish a method for estimating conditional min-entropy using measurement uncertainty and purity constraints.
  • To achieve composable security against quantum attacks on measurement devices.

Main Methods:

  • Utilizing measurement uncertainty under purity constraints for conditional min-entropy estimation.
  • Developing a protocol independent of detailed source and measurement device modeling.
  • Defining a randomness parameter 'C' based on test states and purity conditions.
  • Applying the generalized entropy accumulation theorem for multi-round security analysis.

Main Results:

  • Demonstrated an implicit uncertainty relation derived from purity conditions.
  • Established an analytical bound on extractable randomness using symmetry properties.
  • Achieved composable security against coherent attacks.
  • Showcased exponential secure randomness expansion with high tolerance on a commercial fiber system.

Conclusions:

  • The proposed semi-device-independent QRNG protocol offers enhanced security and practical implementation advantages.
  • The protocol is suitable for integration into photonic platforms, paving the way for secure quantum technologies.
  • This work advances the field of device-independent quantum information processing.