Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Difference from Background: Limit of Detection

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Experimental demonstration of high space compression by optical spaceplates.

Nature communications·2026

Same author

Experimental demonstration of a multi-particle collective measurement for optimal quantum state estimation.

Optics express·2026

Same author

Signatures of correlation of spacetime fluctuations in laser interferometers.

Nature communications·2025

Same author

Sensing with quantum light: a perspective.

Nanophotonics (Berlin, Germany)·2025

Same author

Enhancing Interferometry Using Weak Value Amplification with Real Weak Values.

Physical review letters·2025

Same author

Accreditation of analogue quantum simulators.

Proceedings of the National Academy of Sciences of the United States of America·2024

Search research articles

Related Experiment Video

Updated: Dec 9, 2025

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

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

Published on: May 30, 2014

Approaching Quantum-Limited Metrology with Imperfect Detectors by Using Weak-Value Amplification.

Liang Xu¹, Zexuan Liu¹, Animesh Datta²

¹National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

Physical Review Letters

|September 10, 2020

Summary

Weak-value amplification (WVA) offers enhanced precision for measuring small effects, overcoming limitations of conventional measurement (CM). This study demonstrates WVA

More Related Videos

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Related Experiment Videos

Last Updated: Dec 9, 2025

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

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

Published on: May 30, 2014

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Area of Science:

Quantum Metrology
Precision Measurement Science

Background:

Weak-value amplification (WVA) is a protocol for amplifying ultrasmall physical effects.
Debate exists regarding WVA's precision improvement over conventional measurement (CM) due to suppressed probabilities.

Purpose of the Study:

To experimentally demonstrate the advantages of WVA in overcoming practical measurement limitations.
To validate WVA's capability in maintaining precision across a wide range of light intensities.

Main Methods:

Experimental setup utilizing WVA to measure small physical effects.
Comparison of WVA precision against conventional measurement (CM) under varying light intensities.
Analysis of WVA performance considering photodetector noise and saturation limits.

Main Results:

WVA overcomes practical limitations like noise and photodetector saturation.
Shot-noise-scaling precision is maintained for input light intensities beyond the photodetector's dynamic range.
Achieved precision with WVA was 6 times higher than with CM in the experimental setup.

Conclusions:

WVA offers unambiguous advantages over CM for precision measurements.
Results pave the way for WVA's adoption in precision metrology and commercial sensors for small signal detection.