Abstract

We propose a quantum switch for telecom-band applications that is composed of a χ(2) microdisk coupled to two fibers (or waveguides). The idea is to apply a pump pulse to shift the microdisk out of resonance, thereby switching the device between the cross and bar states in an interaction-free manner. As an example, a 2.5-μm-thick, 10μm radius GaAs microdisk with an intrinsic Q of 108 and a fiber-cavity-coupling Q of 104 can achieve low-loss (1%) switching for gigahertz-rate O-band quantum signals with milliwatt-peak-power pumps in the C band.

© 2010 Optical Society of America

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