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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Measuring entanglement using quantum quenches.

John Cardy1

  • 1Rudolf Peierls Centre for Theoretical Physics, Oxford University, 1 Keble Road, Oxford, OX1 3NP, United Kingdom.

Physical Review Letters
|May 17, 2011
PubMed
Summary
This summary is machine-generated.

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Block entanglement entropies near quantum critical points can be measured by observing low-lying energy level populations after a local quantum quench.

Area of Science:

  • Quantum information theory
  • Condensed matter physics

Background:

  • Quantum critical points (QCPs) are fundamental states in condensed matter systems.
  • Entanglement entropy quantifies quantum correlations, but direct measurement is challenging.

Purpose of the Study:

  • To propose a method for measuring block entanglement entropies.
  • To link these measurements to experimentally accessible quantities.

Main Methods:

  • Theoretical analysis of one-dimensional quantum systems.
  • Investigating the effects of local quantum quenches.
  • Relating entanglement entropy to energy level populations.

Main Results:

  • Block entanglement entropies near QCPs can be determined.

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

Last Updated: Jun 2, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

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

  • The measurement relies on the population dynamics of low-lying energy states.
  • A specific type of local quantum quench is identified as crucial.

    • Conclusions:

    • Provides a potential experimental pathway to quantify entanglement.
    • Connects abstract quantum information measures to observable phenomena.
    • Offers insights into the nature of quantum criticality.