Experimental Testing of Time-domain Quantum Correlation of EPR Entangled Beams
Kunchi Peng · Acta Sinica Quantum Optica · 2009
We measured the quantum fluctuations of the quadratures of signal and idler beams of EPR entangled beams in time domain directly by using the homodyne detection system and data acquisition system,and demonstrated intuitively the quantum correlations between two optical beams.By delaying one of the EPR entangled beams,we verify that if the measurements on the signal and the idler beams are not synchronal,the correlations between them will decrease and finally vanish.The presented experimental method can be utilized in developing quantum key distribution with continuous variables,experimental preparation of non-Gaussian state and entanglement purification.