We have theoretically studied the space-time entangled biphoton state generated from a two-
level atomic system. In the photon counting measurement, the two-photon coincidence …

The nonlinear photon-photon interaction mediated by a single two-level atom is studied
theoretically based on a one-dimensional model of the field-atom interaction. This model …

We propose and demonstrate an approach to measuring the biphoton temporal wave
function with polarization-dependent and time-resolved two-photon interference. Through …

Generation of frequency-correlated narrowband biphotons from the four-wave mixing
process is theoretically analyzed through manipulating optical properties of light …

We report the experimental verification of nonclassical correlations for an unfiltered
spontaneous four-wave mixing process in an ensemble of cold two-level atoms, confirming …

We find that in a two-level system there are two kinds of four-wave mixing processes which
destructively contribute to the third-order nonlinear susceptibility. In a paired-photon …

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 …

We investigate the nonlinear interaction between two photons in a single-input pulse at an
atomic two-level nonlinearity. A one-dimensional model for the propagation of light to and …

The interference of degenerate four-wave mixing (FWM) in three-level systems is examined
in both the classical and quantum regimes with a backward configuration. In classical FWM …

Generating nonclassical light offers a benchmark tool for fundamental research and
potential applications in quantum optics. Conventionally, it has become a standard …