Measurement of Entanglement in Time Domain -- an Experiment towards Demonstration of EPR paradox with Continuous Variable using Laser Pulses

摘要

We report on a measurement of entanglement in the time domain. The entanglement is examined by the Duan-Simon criteria. We obtained Duan-Simon criteria of (DELTA)~(2)(x_(1) - x_(2)) + (DELTA)~(2)(p_(1) + p_(2)) velence 1.4 < 2 without optimal gain and (DELTA)~(2)(x_(1) - x_(2)) + (DELTA)~(2)(p_(1) + p_(2)) velence 1.2 < 2 with optimal gain, respectively. This opens the way to realize both efficient and truly causal EPR paradox.