Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Cross correlation between entangled photon pairs from four-wave mixing in a Warm Ensemble of Rubidium

Tommy Willis, Francisco Willis, Daniel Hemmer, S. L. Rolston, Luis A. Orozco

Published May 22, 2009• 0 citations
OpenAlex

Related papers

Correlation in photon pairs generated using four-wave mixing in a cold atomic ensemble

Andrew R. Ferdinand, Alejandro Manjavacas, F. E. Becerra

Bulletin of the American Physical Society•Jun 8, 2017•0 citations

Generation of a Non-Classical Correlated Photon Pair via Spontaneous Four-Wave Mixing in a Cold Atomic Ensemble

陆小松, 陈群峰, 史保森 +1 more

Chinese Physics Letters•Jan 1, 2009•0 citations

Photon Pair Production from a Hot Atomic Ensemble in the Diamond Configuration

R. T. Willis

This thesis discusses four-wave mixing (4WM) in a warm ensemble of rubidium using the diamond configuration level structure. Both classical 4WM and non- classical photon-pair production are investigated. Quantum information science has spawned a great amount of experimental work on the interaction of light with collective modes of excitation in atomic ensem- bles. Plans to build quantum networks and quantum repeaters with atom ensembles take advantage of nonlinear interactions to produce and store non-classical states of light. These technologies will require photon sources that not only generate non- classical light, but also resonant, narrow band light. Here we investigate a system which could be used as such a source. We take advantage of the 4WM interaction in a warm ensemble of Rubidium atoms. Our scheme utilizes the diamond energy level configuration which, in ru- bidium, allows for correlated pairs at telecommunications wavelengths. We start by examining the properties of classical 4WM in the system. We measure the reso- nance structure and see that it can be understood in terms of velocity class selective resonant enhancement and power splitting effects. The efficiency of the process is low and limited by linear absorption of the pumps. Our observations agree with a semi-classical Maxwell-Bloch theoretical treatment. Next we observe pair generation by spontaneous 4WM from the warm ensem- ble. The temporal profile of the cross-correlation function (CCF) for the photons depends on pump-laser power and detuning. This allows us to produce biphotons with controllable spectra. A simple quantum optical theoretical treatment based on linear filtering gives qualitative agreement with the data. We show that the photon pairs are polarization entangled, clearly violating Bell's Inequality. A perturbative quantum optical treatment predicts the polariza- tion state of the pairs and agrees with our measurements. We analyze the photon statistics of the source and find the largest violation of the two beam Cauchy-Schwarz inequality from a warm atomic source yet. We cast the system as a heralded sin- gle photon source at telecommunications wavelengths and see that it is competitive with other systems in terms of spectral brightness.

•Jan 1, 2009•2 citations

Quantum beats from four-wave mixing in Rubidium 87

F. E. Becerra, R. T. Willis, S. L. Rolston +1 more

"We describe the measurements of the cross-correlation function of photon pairs at 780 nm and 1367 nm showing quantum beats from Four- Wave Mixing (FWM) generated in Rubidium 87. The quantum beats come from the interference between two-photon decay paths through different intermediate hyperfine states in the process. We observe that it is possible to select different decay paths, and modify the biphoton spectra, by coupling different hyperfine levels of the atomic configuration in Rubidium with the pump fields and using selection rules."

Revista Mexicana de Física•Jan 1, 2011•1 citation

Solid-state ensemble of highly entangled photon sources at rubidium atomic transitions

Michael Zopf, Robert Keil, Yan Chen +4 more

Bulletin of the American Physical Society•Mar 15, 2017•0 citations

Quantum Correlations of Spin-wave-photon Pairs Produced from an Atomic Ensemble Coupled to a Ring Cavity

Haole Jiao, Minjie Wang, Jiajin Lu +5 more

Journal of the Physical Society of Japan•Aug 8, 2024•1 citation
This thesis discusses four-wave mixing (4WM) in a warm ensemble of rubidium using the diamond configuration level structure. Both classical 4WM and non- classical photon-pair production are investigated. Quantum information science has spawned a great amount of experimental work on the interaction of light with collective modes of excitation in atomic ensem- bles. Plans to build quantum networks and quantum repeaters with atom ensembles take advantage of nonlinear interactions to produce and store non-classical states of light. These technologies will require photon sources that not only generate non- classical light, but also resonant, narrow band light. Here we investigate a system which could be used as such a source. We take advantage of the 4WM interaction in a warm ensemble of Rubidium atoms. Our scheme utilizes the diamond energy level configuration which, in ru- bidium, allows for correlated pairs at telecommunications wavelengths. We start by examining the properties of classical 4WM in the system. We measure the reso- nance structure and see that it can be understood in terms of velocity class selective resonant enhancement and power splitting effects. The efficiency of the process is low and limited by linear absorption of the pumps. Our observations agree with a semi-classical Maxwell-Bloch theoretical treatment. Next we observe pair generation by spontaneous 4WM from the warm ensem- ble. The temporal profile of the cross-correlation function (CCF) for the photons depends on pump-laser power and detuning. This allows us to produce biphotons with controllable spectra. A simple quantum optical theoretical treatment based on linear filtering gives qualitative agreement with the data. We show that the photon pairs are polarization entangled, clearly violating Bell's Inequality. A perturbative quantum optical treatment predicts the polariza- tion state of the pairs and agrees with our measurements. We analyze the photon statistics of the source and find the largest violation of the two beam Cauchy-Schwarz inequality from a warm atomic source yet. We cast the system as a heralded sin- gle photon source at telecommunications wavelengths and see that it is competitive with other systems in terms of spectral brightness.
"We describe the measurements of the cross-correlation function of photon pairs at 780 nm and 1367 nm showing quantum beats from Four- Wave Mixing (FWM) generated in Rubidium 87. The quantum beats come from the interference between two-photon decay paths through different intermediate hyperfine states in the process. We observe that it is possible to select different decay paths, and modify the biphoton spectra, by coupling different hyperfine levels of the atomic configuration in Rubidium with the pump fields and using selection rules."