Detection of atomic entanglement and electromagnetically induced transparency in velocity-selective coherent population trapping

This work demonstrated theoretically that the entangled coherences of an atomic velocity-selective coherent population trapping (VSCPT) gas give rise to a distinctive optical signal, a backscattered beam of light, when the VSCPT gas is probed with a weak signal laser pulse. If the probe pulse and the pump beams are simultaneously applied the VSCPT gas also exhibits the phenomenon of electromagnetically induced transparency (EIT).