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Instant single-photon Fock state tomography.

S R Huisman¹, Nitin Jain, S A Babichev

¹Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4, Canada.

|September 17, 2009

Summary

This summary is machine-generated.

Researchers prepared heralded single photons at 100 kHz using biphotons from a periodically poled potassium-titanyl phosphate crystal. They confirmed the single-photon Fock state with high-fidelity optical homodyne tomography, enabling real-time apparatus alignment.

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Area of Science:

Quantum Optics
Photonics
Quantum Information Science

Background:

Single-photon sources are crucial for quantum technologies.
Efficient preparation and characterization of single photons are key challenges.
Biphoton generation offers a pathway to heralded single photons.

Purpose of the Study:

To develop a high-rate source of heralded single photons.
To characterize the single-photon Fock state using advanced techniques.
To enable real-time optimization of quantum optical setups.

Main Methods:

Conditional measurements on polarization-nondegenerate biphotons.
Generation of biphotons in a periodically poled potassium-titanyl phosphate (PPKTP) crystal.
High-frequency pulsed optical homodyne tomography for state characterization.

Main Results:

Preparation of heralded single photons at approximately 100 kHz.
Characterization of the single-photon Fock state with a fidelity of (57.6 ± 0.1)%.
Real-time analysis of quadrature statistics for on-the-fly apparatus alignment.

Conclusions:

Demonstrated a practical method for generating heralded single photons at a significant rate.
Validated the quality of the single-photon state through tomographic characterization.
The developed technique facilitates efficient and adaptive alignment of quantum optical systems.