Entangled Photon Polarimetry
  We construct an entangled photon polarimeter capable of monitoring a two-qubit quantum state in real time. Using this polarimeter, we record a nine frames-per-second video of a two-photon state's transition from separability to entanglement. 
Joseph B. Altepeter, Neal N. Oza, Milja Medic, Evan R. Jeffrey, and   Prem Kumar
quant-ph