Spectral factorable biphotons for an unfiltered heralded single photon source at telecom wavelength

报告人
Dr.Changchen Chen
单位
Massachusetts Institute of Technology
时间
2017-12-29 (周五) 10:30
地点
上海研究院4号楼331会议室(理化楼2003室同步视频)
摘要

Spectrally unentangled biphotons with high single-spatiotemporal-mode purity are highly desirable for many quantum information processing tasks. This talk will describe the generation of biphotons with an inferred heralded-state spectral purity of 99%, the highest to date without any spectral filtering, by pulsed spontaneous parametric downconversion in a custom-fabricated periodically-poled KTiOPO4 crystal under extended phase-matching conditions. Two methods of characterizing the joint spectral intensity of the biphotons will be considered. Recent progress on interference visibility between independent photons generated from this heralded photon source with two subsequent laser pulses will also be discussed.