Engineering topics

Shanchao, Zhang

Publications and source records attributed to Shanchao, Zhang.

2 records

DOE OSTI2011

Optical Precursor of a Single Photon

We report the direct observation of optical precursors of heralded single photons with step- and square-modulated wave packets passing through cold atoms. Using electromagnetically induced transparency and the slow-light effect, we separate the single-photon precursor, which always travels at the speed of light in vacuum, from its delayed main wave packet. In the two-level superluminal medium, our result suggests that the causality holds for a single photon.

74 ATOMIC AND MOLECULAR PHYSICS↗

DOE OSTI2010

Shaping Biphoton Temporal Waveforms with Modulated Classical Fields

We experimentally demonstrate a technique for shaping the temporal quantum waveform of narrow-band biphotons generated in a cold atomic ensemble via four-wave mixing by periodically modulating the two input classical lasers. We show that it is possible to generate nonclassical paired photons with a predesigned shape of the correlation function.

71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗