title: Experimental realization of a 2 × 2 polarization-independent split-ratio-tunable optical beam splitter.
abstract: We realized a polarization-independent split-ratio-tunable optical beam splitter supporting two input and output ports through a stable interferometer. By adjusting the angle of a half-wave plate in the interferometer, we can tune the beam splitter reflectivities for both input ports from 0 to 1, regardless of the input light polarization. High-fidelity polarization-preserving transmission from input to output ports was verified by complete quantum process tomography. Nearly optimal interference effects at the beam splitter with various split ratios were observed by two-photon Hong-Ou-Mandel interference for different input polarization states. Such a beam splitter could find a variety of applications in classical and quantum optical technologies.
authors.forename: Ran
authors.initials: R
authors.lastname: Yang
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.forename: Xiao-Bo
authors.initials: XB
authors.lastname: Song
authors.forename: Ting
authors.initials: T
authors.lastname: Gao
authors.forename: Yi-Ran
authors.initials: YR
authors.lastname: Li
authors.forename: Yun-Jiao
authors.initials: YJ
authors.lastname: Zhang
authors.forename: Xiao-Xi
authors.initials: XX
authors.lastname: Chen
authors.forename: Yan-Xiao
authors.initials: YX
authors.lastname: Gong