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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
Measuring Reaction Rates03:09

Measuring Reaction Rates

Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical field in...
Group Polarization01:01

Group Polarization

Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...

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Updated: May 25, 2026

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

Entangled photon polarimetry.

Joseph B Altepeter1, Neal N Oza, Milja Medić

  • 1Center for Photonic Communication and Computing, EECS Department Northwestern University, Evanston, IL 60208 USA. joe.altepeter@gmail.com

Optics Express
|January 26, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel entangled photon polarimeter to observe quantum states. This device captured a real-time video showing a two-photon state evolving from separability to entanglement.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Experimental Physics

Background:

  • Entanglement is a key quantum phenomenon crucial for quantum information processing.
  • Real-time monitoring of quantum state evolution is essential for understanding and controlling quantum systems.
  • Existing methods often lack the temporal resolution to capture dynamic quantum transitions.

Purpose of the Study:

  • To develop and demonstrate an entangled photon polarimeter for real-time quantum state monitoring.
  • To experimentally capture the dynamic transition of a two-photon state from separability to entanglement.
  • To provide a new tool for investigating the dynamics of quantum entanglement.

Main Methods:

  • Construction of a specialized entangled photon polarimeter.
  • Utilizing the polarimeter to monitor a two-qubit quantum system.
  • Recording video data at nine frames per second to capture state evolution.

Main Results:

  • Successfully constructed an entangled photon polarimeter.
  • Achieved real-time monitoring of a two-qubit quantum state.
  • Recorded a video documenting the transition from a separable to an entangled two-photon state at 9 frames per second.

Conclusions:

  • The developed polarimeter enables real-time observation of quantum state dynamics.
  • The experiment successfully visualized the dynamic emergence of entanglement.
  • This technology offers new possibilities for studying and manipulating quantum states.