Characterizing an entangled-photon source with classical detectors and measurements

Autor(en)

Lee A. Rozema, Chao Wang, Dylan H. Mahler, Alex Hayat, Aephraim M. Steinberg, John E. Sipe, Marco Liscidini

Abstrakt

Entangled-photon pairs are essential for many applications in quantum computation and communication, and quantum state tomography (QST) is the universal tool to characterize such entangled-photon sources. In QST, very low-power signals must be measured with single-photon detectors and coincidence logic. Here, we experimentally implement a new protocol, "stimulated-emission tomography" (SET), allowing us to obtain the information provided by QST when the photon pairs are generated by parametric fluorescence. This approach exploits a stimulated process that results in a signal several orders of magnitude larger than in QST. In particular, we characterize the polarization state of photons that would be generated in spontaneous parametric downconversion using SET. We find that SET accurately predicts the purity and concurrence of the spontaneously generated photons in agreement with the results of QST. We expect that SET will be extremely useful to characterize entanglement sources based on parametric fluorescence, providing a fast and efficient technique to potentially replace or supplement QST.

Organisation(en)

Quantenoptik, Quantennanophysik und Quanteninformation

Externe Organisation(en)

University of Toronto, Canadian Institute for Advanced Research, Technion - Israel Institute of Technology, Università degli studi di Pavia

Journal

Optica

Band

2

Seiten

430-433

Anzahl der Seiten

4

ISSN

2334-2536

Publikationsdatum

05-2015

Peer-reviewed

Ja

ÖFOS 2012

103026 Quantenoptik

Schlagwörter

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Atomic and Molecular Physics, and Optics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/e2ab72c7-5600-452b-8b5a-cef3727c6c68