16:30 〜 16:45
▲ [25p-D214-14] The observation of Two-photon Interference with different spectral bandwidth
キーワード：weak coherent photon, HOM interference, spontaneous parametric down-conversion
We experimentally investigate a two-photon interference between a heralded photon from spontaneous parametric down conversion (SPDC) and a weak coherent photon from the laser source, by changing the spectral bandwidth of the heralded photon. The experimental result show a maximum interference visibility of 0.4 when SPDC is employed a 1nm bandpass filter and it indicates that the perfect interference visibility of 0.5 will ocuur when two different photons have the same spectral bandwidth.