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Generation of paired photons with controllable waveforms.
Vlatko Balić1, Danielle A Braje, Pavel Kolchin
1Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA. vbalic@stanford.edu
Physical Review Letters
|May 21, 2005
Summary
Researchers generated controllable, counterpropagating paired photons using electromagnetically induced transparency and cold atoms. This breakthrough offers a new method for creating quantum-entangled photon pairs with potential applications in quantum communication.
Area of Science:
- Quantum optics
- Atomic physics
- Photonics
Background:
- Generating entangled photon pairs is crucial for quantum information science.
- Existing methods often face limitations in control and efficiency.
Purpose of the Study:
- To demonstrate a novel method for generating counterpropagating paired photons.
- To investigate the coherence times and waveform controllability of these photons.
- To achieve a high generation rate for practical applications.
Main Methods:
- Utilized continuous-wave (cw) lasers.
- Employed electromagnetically induced transparency (EIT) in cold 87Rb atoms.
- Coupled generated photons into opposing single-mode optical fibers.
Main Results:
- Achieved paired photon generation with coherence times of approximately 50 ns.
- Demonstrated rudimentary control over photon waveforms.
- Reached a generation rate of approximately 12,000 pairs per second.
Conclusions:
- The study presents a viable method for producing high-quality, counterpropagating entangled photon pairs.
- The demonstrated control and high generation rate pave the way for advancements in quantum technologies.
- This technique offers a promising platform for future quantum communication and computation research.