Demonstrating various quantum effects with two entangled laser beams
B. Hage, J. Janou\v{s}ek, S. Armstrong, T. Symul, J. Bernu, H.M., Chrzanowski, P.K. Lam, H.A. Bachor
TL;DR
This paper demonstrates high-quality entangled laser beams exhibiting quantum effects, including EPR-criterion violation and single-photon state extraction, showcasing advanced quantum state control and measurement techniques.
Contribution
It presents the first preparation of entangled two-mode squeezed states with unprecedented quality and demonstrates quantum state tomography for single-photon extraction from laser beams.
Findings
Violation of EPR-criterion at 0.36±0.03
Single-photon probability exceeds 2/3
Quantum features confirmed through tomography
Abstract
We report on the preparation of entangled two mode squeezed states of yet unseen quality. Based on a measurement of the covariance matrix we found a violation of the Reid and Drummond EPR-criterion at a value of only 0.36\pm0.03 compared to the threshold of 1. Furthermore, quantum state tomography was used to extract a single photon Fock state solely based on homodyne detection, demonstrating the strong quantum features of this pair of laser-beams. The probability for a single photon in this ensemble measurement exceeded 2/3.
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