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Theory of single photon on demand from a single molecule source
1Department of Chemistry and Biochemistry, Notre Dame University, Notre Dame, IN 46556, USA.
Physical Chemistry Chemical Physics : PCCP
|November 9, 2006
Summary
This study explores methods for generating single photons on demand from two-level sources. Researchers found optimal conditions for single and photon pair emission, validating the two-level system model for cryogenic single molecules.
Area of Science:
- Quantum Optics
- Atomic Physics
- Photonics
Background:
- Controlling single photon emission is crucial for quantum technologies.
- Two-level systems (atoms/molecules) are fundamental sources for single photons.
Purpose of the Study:
- Investigate and compare three distinct methods for single photon control from two-level sources.
- Determine optimal conditions for maximizing single and photon-pair emission probabilities.
- Validate theoretical models against experimental data.
Main Methods:
- Utilized optical Bloch equations and the generating function formalism.
- Analyzed three control approaches: square laser pulse, frequency modulation, and rapid adiabatic following.
- Derived analytical expressions for zero, one, and two-photon emission probabilities for the square pulse method.
Main Results:
- Identified conditions for maximizing single and photon-pair emission.
- Obtained analytical expressions for photon emission probabilities under specific pulse conditions.
- Numerical results align well with experimental data from Brunel et al.
Conclusions:
- The two-level system model accurately describes single photon emission from cryogenic single molecules.
- Experimental conditions were near-optimal for single photon generation.
- The generating function formalism provides a robust framework for analyzing single photon sources.
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