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Simple performance evaluation of pulsed spontaneous parametric down-conversion sources for quantum communications.

Jean-Loup Smirr¹, Sylvain Guilbaud, Joe Ghalbouni

¹Laboratoire Traitement et Communication de l'Information, Télécom ParisTech, CNRS, Institut Télécom, Paris, France.

|January 26, 2011

Summary

We present a simple method for fast characterization of pulsed spontaneous parametric down conversion (SPDC) sources, crucial for quantum technologies. This technique evaluates SPDC sources efficiently, ensuring quality for quantum information processing and communication applications.

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Area of Science:

Quantum optics
Quantum information science

Background:

Characterizing pulsed spontaneous parametric down conversion (SPDC) sources is vital for quantum information processing and communications.
Accurate source evaluation is needed for reliable quantum applications.

Purpose of the Study:

To develop and validate a simple, fast method for characterizing pulsed SPDC sources.
To enable comprehensive evaluation of SPDC source parameters including pair emission probability, losses, and fidelity.

Main Methods:

Measuring photon counts on output channels and coincidences.
Modeling the spectral filter used to reduce source bandwidth.
Experimental validation of the proposed characterization technique.

Main Results:

The method successfully characterizes SPDC sources of varying bandwidths.
Key parameters like pair emission probability, total losses, and fidelity are accurately determined.
The technique is shown to be efficient and requires minimal measurement.

Conclusions:

The proposed method offers a straightforward and rapid approach for pulsed SPDC source characterization.
This technique is applicable for initial setup and continuous quality verification of quantum communication links.
It facilitates the advancement of quantum technologies by ensuring reliable SPDC source performance.