Center for Molecular Spectroscopy and Dynamics

      IBS Center for Molecular Spectroscopy and Dynamics

■        SPEAKER
Prof. Han Seb Moon (Pusan University)

■        TITLE
Polarization-Entangled Photons from Warm Atomic Ensemble using Sagnac Interferometer

■     ABSTRACT
   We report a polarization-entangled photon-pair source obtained via spontaneous four-wave mixing (SFWM) in a Doppler-broadened atomic ensemble of 87Rb atoms using a Sagnac interferometer. Collective two-photon coherence occurs in the Doppler-broadened ladder-type atomic system with bidirectional counter-propagating two-photon resonant pump and coupling fields; hence, polarization-entangled photon-pairs are collectively radiated in the phase-matched direction. Without phase stabilization of the interferometry for polarization entanglement, we robustly produce all four Bell states via a polarization Sagnac configuration. The brightness, stability, and temporal purity advantages provided by our polarization-entangled SFWM photon-pair source have very important applications in the context of a practical scalable quantum network.

■     DATE AND VENUE
 May 2, 2019 (Thursday, 4:00 - 5:00 pm)  

Seminar Room A (116), KU R&D Center

■        LANGUAGE
Korean

■        INVITED BY
Associate Director Wonshik Choi