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

Deactivation Processes: Jablonski Diagram

Deactivation Processes: Jablonski Diagram

Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...

Photoelectric Effect

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

Biasing of Metal-Semiconductor Junctions

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

Potential Due to a Polarized Object

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,...

You might also read

Related Articles

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

Sort by

Same author

Those who need it the most get it the least: Age specific reciprocal effects between social support and mental strain.

Acta psychologica·2022

Same author

Bleeding and ischaemic events after first bleed in anticoagulated atrial fibrillation patients: risk and timing.

European heart journal·2022

Same author

Managers' Action-Guiding Mental Models towards Mental Health-Related Organizational Interventions-A Systematic Review of Qualitative Studies.

International journal of environmental research and public health·2022

Same author

Effective refractive error coverage in adults aged 50 years and older: estimates from population-based surveys in 61 countries.

The Lancet. Global health·2022

Same author

BCC-Cu nanoparticles: from a transient to a stable allotrope by tuning size and reaction conditions.

Physical chemistry chemical physics : PCCP·2022

Same author

Applying risk matrices for assessing the risk of psychosocial hazards at work.

Frontiers in public health·2022

Search research articles

Related Experiment Video

Updated: Jun 14, 2026

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

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

Published on: September 5, 2019

Creating polarization-entangled photon pairs from a semiconductor quantum dot using the optical Stark effect.

Andreas Muller¹, Wei Fang, John Lawall

¹Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland, USA. andreas.muller@nist.gov

Physical Review Letters

|April 7, 2010

Summary

Researchers created two-photon entanglement in quantum dots (QDs) by using an external laser field to cancel exciton splitting. This method enables routine production of polarization-entangled photons in semiconductor nanostructures.

More Related Videos

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Related Experiment Videos

Last Updated: Jun 14, 2026

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

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

Published on: September 5, 2019

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

Quantum optics
Semiconductor nanostructures
Quantum information science

Background:

Epitaxial quantum dots (QDs) typically exhibit energy splitting of optical excitons.
This exciton splitting hinders the creation of two-photon entanglement during biexciton decay.

Purpose of the Study:

To overcome exciton splitting in QDs.
To generate two-photon entanglement in semiconductor nanostructures.
To demonstrate routine production of polarization-entangled photons.

Main Methods:

Utilized an external continuous-wave laser field tuned to the quantum dot in the ac Stark limit.
Applied quantum-state tomography to reconstruct the two-photon density matrix.

Main Results:

Successfully canceled the exciton energy splitting in quantum dots.
Created and verified two-photon entanglement using entanglement tests.
Demonstrated the feasibility of producing polarization-entangled photons.

Conclusions:

The ac Stark effect can be used to remove exciton splitting in QDs.
This technique provides a pathway for robust generation of entangled photons.
Semiconductor nanostructures are a viable platform for scalable quantum entanglement generation.