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Related Experiment Video

Updated: Dec 13, 2025

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Picometer-Precision Atomic Position Tracking through Electron Microscopy

Published on: July 3, 2021

Quantum advantage in postselected metrology.

David R M Arvidsson-Shukur^1,2,3, Nicole Yunger Halpern^4,5,6, Hugo V Lepage⁷

¹Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge, CB3 0HE, UK. drma2@cam.ac.uk.

Nature Communications

|July 31, 2020

Summary

This summary is machine-generated.

Postselection enhances parameter estimation by leveraging quantum mechanics. Negative quasiprobabilities, unique to quantum systems, enable postselected experiments to achieve superior information-cost rates compared to classical methods.

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

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Published on: May 30, 2014

Area of Science:

Quantum Information Science
Metrology
Quantum Foundations

Background:

Parameter estimation experiments incur costs during measurement or postprocessing.
Postselection offers a method to potentially improve the information gained per unit cost.

Purpose of the Study:

To investigate the role of quasiprobability distributions in postselection's enhancement of Fisher information.
To demonstrate that the advantage of postselection in metrology is a distinctly quantum phenomenon.

Main Methods:

Analysis of a specific quasiprobability distribution, a quantum generalization of probability distributions.
Comparison of classical theories (commuting observables) with quantum theories (noncommuting observables).

Main Results:

The negativity of the quasiprobability distribution is identified as the source of postselection's advantage.
Quantum experiments with negative quasiprobabilities can achieve higher information-cost rates than classical experiments.
Anomalously large Fisher information rates are shown to be unrealizable in classical theories.

Conclusions:

The metrological advantage gained through postselection is a direct consequence of quantum nonclassicality.
The developed quasiprobability distribution serves as a mathematical tool to identify and quantify this quantum advantage.