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Two-photon quantum interference in the 1.5 mum telecommunication band
Optics Express
|June 24, 2009
Summary
We demonstrated two-photon quantum interference using identical photons in the 1.5 mm wavelength band. Our fiber-optic Hong-Ou-Mandel interferometer experiments achieved near-perfect interference visibility, exceeding classical limits.
Area of Science:
- Quantum Optics
- Photonics
- Quantum Information
Background:
- Quantum interference is a fundamental phenomenon in quantum mechanics.
- Spontaneous parametric down-conversion (SPDC) is a key source for generating entangled photon pairs.
- The Hong-Ou-Mandel (HOM) interferometer is a standard tool for demonstrating quantum interference of photons.
Purpose of the Study:
- To investigate two-photon quantum interference in the standard telecommunication band (1.5 mm).
- To generate and interfere identical photons using a fiber-optic HOM interferometer.
- To verify the high visibility of quantum interference in this spectral range.
Main Methods:
- Utilized type-I spontaneous parametric down-conversion (SPDC) to generate photon pairs.
- Employed a fiber-optic Hong-Ou-Mandel (HOM) interferometer to combine photons from spatially separated modes.
- Observed two-photon interference patterns by analyzing coincidence counting rates as a function of optical path length difference.
Main Results:
- Achieved high-visibility two-photon interference patterns, including a dip and spatial beating.
- Observed interference visibilities close to the theoretical 100% in net coincidences.
- Demonstrated raw visibilities significantly above the classical limit.
Conclusions:
- Confirms the feasibility of high-visibility quantum interference experiments in the 1.5 mm telecommunication band.
- Highlights the potential of SPDC and fiber-optic HOM interferometers for quantum communication applications.
- Validates the quantum nature of the generated photons and the interference process.
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