Demonstrating various quantum effects with two entangled laser beams
ARC Centre of Excellence for Quantum-Atom Optics, Department of
Quantum Science, The Australian National University, Canberra, Australian Capital Territory
2 Centre for Quantum Computation and Communication Technology, Department of Quantum Science, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
a e-mail: email@example.com
Published online: 23 June 2011
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 ± 0.03 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.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011