Quantum Interference Between Nondegenerate Photons

Shengwang Du, Kim, Yoon-Ho, Liu, Chang +4 more

Chang Liu, J. F. Chen, Shanchao Zhang +5 more

孙江 Sun Jiang, Sun Juan, Ying Wang +2 more

We study the quantum interference in three-photon resonant nondegenerate six-wave mixing (NSWM) of a five-level system in which the middle level of six-wave mixing and other levels are coupled by a strong laser field. The coupling field-dependence of the NSWM signal intensity, and the spectrum of the NSWM with a coupling field, are discussed. We find that in the presence of a strong coupling field, the three-photon resonant NSWM spectrum exhibits Autler-Townes splitting, which reflects the levels of the dressed states. It also leads to either suppression or enhancement of the NSWM signal. Due to the enhancement of NSWM signal caused by quantum interference, the dressed state created by a coupling field can replace the atom intrinsic level and serve as the middle level of three-photon resonance. Thus the middle level of three-photon resonance can be controlled by a coupling field.

Juan Sun, Sun Jiang, Ying Wang +2 more

We study the quantum interference in three-photon resonant nondegenerate six-wave mixing (NSWM) in a five-level system in which the middle level of six-wave mixing and other level are coupled by a strong laser field. The coupling field-dependence of the NSWM signal intensity and the spectrum of the NSWM with a coupling field are discussed. We find that in the presence of a strong coupling field, the three-photon resonant NSWM spectrum exhibits Autler-Townes splitting, which reflects the levels of the dressed states. It also leads to either suppression or enhancement of the NSWM signal.

Chang Liu, J. F. Chen, Shanchao Zhang +5 more

We generate narrow-band frequency-tunable entangled photon pairs from spontaneous four-wave mixing in three-level cold atoms and study their two-photon quantum interference after a beam splitter. We find that the path-exchange symmetry plays a more important role in the Hong-Ou-Mandel interference than the temporal or frequency indistinguishability, and observe coalescence interference for both degenerate and nondegenerate photons. We also observe a quantum beat in the same experimental setup using either slow or fast detectors.

Rainer Kaltenbaek, B. Blauensteiner, Markus Aspelmeyer +1 more