Phys.org January 3, 2023
In quantum entanglement when the systems interact with their surroundings, they almost immediately become disentangled. An international team of researchers (Brazil, USA – University of Oklahoma) produced a light source that produced two entangled light beams. The twin beams generated with a doubly resonant optical parameter oscillator (OPO) based on four-wave mixing in hot 85Rb vapor above threshold. They reconstructed the covariance matrix for several configurations and based on a full picture of the four-side band mode state, they studied entanglement between all possible bipartitions. They showed a robust generation of entanglement with stronger generation for a specific pair of modes. For this system, they showed that atomic density is a determinant factor for the generation and loss of quantum correlations. The generation of entangled fields enables a natural integration into quantum networks…read more. TECHNICAL ARTICLEÂ
Representation of frequency sidebands surrounding their corresponding mode carriers “
a ” and “ b .” Credit: Phys. Rev. Lett. 129, 163601, 11 October 2022Â