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Tunable narrowband entangled photon pair source for resonant single-photon single-atom interaction.
Albrecht Haase1, Nicolas Piro, Jürgen Eschner
1ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, Castelldefels (Barcelona), Spain.
Optics Letters
|December 26, 2008
Summary
We developed a tunable, frequency-stabilized entangled photon source for quantum applications. This narrow-bandwidth source precisely matches calcium ion transitions, enabling advanced quantum control and communication.
Area of Science:
- Quantum Optics
- Atomic Physics
- Photonics
Background:
- Entangled photon pairs are crucial for quantum information processing.
- Precise wavelength and bandwidth control are necessary for interfacing with atomic systems.
- Spontaneous parametric downconversion (SPDC) is a key technology for generating entangled photons.
Purpose of the Study:
- To develop a tunable, frequency-stabilized, narrow-bandwidth source of frequency-degenerate, entangled photon pairs.
- To enable efficient interfacing with specific transitions in (40)Ca(+) ions.
- To provide a high spectral power density for practical quantum applications.
Main Methods:
- Utilizing spontaneous parametric downconversion (SPDC) in periodically poled potassium titanyl phosphate (KTP).
- Implementing frequency stabilization techniques for precise wavelength control.
- Achieving a narrow output bandwidth of 22 MHz.
Main Results:
- Demonstrated a tunable source with stabilized wavelengths at 850 nm and 854 nm.
- Achieved an output bandwidth of 22 MHz, matching the absorption bandwidth of (40)Ca(+) ions.
- Obtained a spectral power density of 1.0 generated pairs/(s MHz mW).
Conclusions:
- The developed source offers precise control over entangled photon properties.
- The source is well-suited for applications involving (40)Ca(+) ion qubits.
- This work advances the development of robust quantum technologies.
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