Interaction-free all-optical switching in χ ð2Þ microdisks for quantum applications

摘要

We propose a quantum switch for telecom-band applications that is composed of a χð Þnmicrodisk coupled to twonfibers (or waveguides). The idea is to apply a pump pulse to shift the microdisk out of resonance, thereby switchingnthe device between the cross and bar states in an interaction-free manner. As an example, a 2.5-μm-thick, 10 μmnradius GaAs microdisk with an intrinsic Q of ∼108nand a fiber-cavity-coupling Q of ∼104ncan achieve low-loss (≲1%)nswitching for gigahertz-rate O-band quantum signals with milliwatt-peak-power pumps in the C band. © 2010nOptical Society of America