Related Experiment Video
Updated: Mar 11, 2026
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
9.0K
Highly bright photon-pair generation in Doppler-broadened ladder-type atomic system
Optics Express
|December 2, 2016
Summary
Researchers developed a bright photon-pair source using 87Rb atoms, achieving high generation rates. This quantum light source enhances entanglement swapping between independent sources.
Area of Science:
- Quantum Optics
- Atomic Physics
- Quantum Information Science
Background:
- Spontaneous four-wave mixing (SFWM) is a key process for generating photon pairs.
- Doppler-broadened atomic ensembles offer potential for enhanced photon generation.
- Efficient quantum light sources are crucial for advancing quantum technologies.
Purpose of the Study:
- To develop a highly bright photon-pair source.
- To enhance photon-pair generation rates using atomic ensembles.
- To demonstrate the utility of the source for quantum entanglement swapping.
Main Methods:
- Utilized spontaneous four-wave mixing in a Doppler-broadened 87Rb atomic ensemble.
- Exploited two-photon coherence contributions from various atomic velocity groups.
- Measured the coincidence counting rate and Cauchy-Schwarz inequality violation.
Main Results:
- Achieved a coincidence counting rate per input power (cps/mW) in the tens of thousands.
- Observed a violation of the Cauchy-Schwarz inequality by a factor of 2370 ± 150.
- Demonstrated enhanced photon-pair generation due to atomic velocity group contributions.
Conclusions:
- The developed scheme provides a highly bright paired photon source.
- This source is valuable for quantum entanglement swapping between autonomous sources.
- The findings contribute to the development of practical quantum light sources.
Related Concept Videos
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.7K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.7K
02:32The de Broglie Wavelength
34.2K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
34.2K
01:25Deactivation Processes: Jablonski Diagram
2.0K
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...
2.0K
02:39Emission Spectra
77.3K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
77.3K
01:10Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
3.0K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
3.0K
01:04¹³C NMR: ¹H–¹³C Decoupling
2.0K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
2.0K