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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

Correlated photon emission from multiatom Rydberg dark States.

J D Pritchard¹, C S Adams, K Mølmer

¹Department of Physics, Durham University, Rochester Building, South Road, Durham DH1 3LE, United Kingdom.

Physical Review Letters

|March 10, 2012

Summary

We demonstrate that Rydberg atom interactions create correlated photon pairs, enabling an efficient source for quantum applications. This method generates photon pairs approximately every 30 microseconds.

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Area of Science:

Atomic physics
Quantum optics
Quantum information science

Background:

Three-level atoms in a ladder configuration are studied.
The upper level is a highly excited Rydberg state, susceptible to strong interactions.

Purpose of the Study:

To investigate the impact of dipole-dipole interactions between Rydberg excited atoms.
To explore the potential for generating correlated photon pairs using these interactions.

Main Methods:

Theoretical analysis of a three-level atomic system driven by two resonant light fields.
Modeling dipole-dipole interactions between Rydberg states of separated atoms.

Main Results:

Rydberg interactions prevent the formation of single-particle dark states.
Strongly correlated photon pairs are generated from atoms separated by distances larger than the emission wavelength.
An efficient photon-pair source is realized, producing one pair every 30 microseconds on average.

Conclusions:

Dipole-dipole interactions in Rydberg excited atoms are crucial for generating correlated photon pairs.
This system offers a promising route towards efficient sources for quantum communication and computation.