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Related Concept Videos

Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Uncertainty in Measurement: Reading Instruments02:46

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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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Uncertainty in Measurement: Significant Figures03:34

Uncertainty in Measurement: Significant Figures

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All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a measured value; for example, if a scale that shows weight to the nearest pound reads “140,” then the 1 (hundreds), 4 (tens), and 0 (ones) are all significant (measured) values.
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Rules for Significant Figures01:44

Rules for Significant Figures

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In any measurement, the precision of the measuring tool is an essential factor. An ordinary ruler, for example, can measure length to the closest millimeter; a caliper, on the other hand, can measure length to the nearest 0.01 mm. As a result, the caliper is a more precise measurement tool because it can measure extremely minute changes in length. The measurements will be more accurate if the measuring tool is more precise.
It should be emphasized that when we represent measured values, the...
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Significant Figures in Calculations00:58

Significant Figures in Calculations

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Uncertainty in measurements can be avoided by reporting the results of a calculation with the correct number of significant figures. This can be determined by the following rules for rounding numbers:
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Estimation of the Physical Quantities01:05

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On many occasions, physicists, other scientists, and engineers need to make estimates of a particular quantity. These are sometimes referred to as guesstimates, order-of-magnitude approximations, back-of-the-envelope calculations, or Fermi calculations. The physicist Enrico Fermi was famous for his ability to estimate various kinds of data with surprising precision. Estimating does not mean guessing a number or a formula at random. Instead, estimation means using prior experience and sound...
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Compact Quantum Dots for Single-molecule Imaging
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Compact Quantum Dots for Single-molecule Imaging

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Deterministic Printing of Single Quantum Dots.

Gregory G Guymon1, Hao A Nguyen2, David Sharp3

  • 1Mechanical Engineering Department, University of Washington, Seattle, 98195, USA.

Advanced Materials (Deerfield Beach, Fla.)
|October 8, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new printing method to precisely place single quantum dots (QDs) for advanced quantum technologies. This technique enables scalable manufacturing of quantum devices with nanoscale precision.

Keywords:
additive manufacturingelectrohydrodynamic printingnanomanufacturingnanoparticle integrationnanophotonicsquantum dotssingle‐photon emitters

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Area of Science:

  • Nanotechnology
  • Quantum Optics
  • Materials Science

Background:

  • Quantum dots (QDs) possess unique optical properties ideal for quantum applications.
  • Scalable, deterministic integration of single QDs into devices is challenging due to manufacturing incompatibilities.

Purpose of the Study:

  • To develop a scalable and deterministic method for heterointegrating single quantum dots.
  • To overcome limitations of previous colloidal deposition strategies for quantum dot placement.

Main Methods:

  • Introduced Single Particle Extraction Electrodynamics (SPEED) printing, an electrohydrodynamic (EHD) technique.
  • Utilized nanoscale dielectrophoretics for precise extraction and deposition of single colloidal QDs from apolar solvents.
  • Achieved selective deposition at sub-zeptoliter volumes, minimizing waste.

Main Results:

  • Demonstrated deterministic placement and integration of single QDs into nanophotonic cavities.
  • Confirmed single-photon emission from printed QDs using photoluminescence and autocorrelation function (g(2)) measurements.
  • Achieved high precision and scalability in QD integration.

Conclusions:

  • SPEED printing offers a powerful, scalable, and sustainable platform for quantum device fabrication.
  • Enables precise integration of quantum light sources and photonic circuits.
  • Advances the development of secure quantum communication and quantum computing technologies.