  In this paper, we report an experimental realization of quantum switch using
nuclear spins and magnetic resonant pulses. The nuclear spins of H and C in
carbon-13 labelled chloroform are used to carry the information, then nuclear
magnetic resonance pulses are applied to perform either bypass or cross
function to achieve the switching. Compared with a traditional space or time
domain switch, this switching architecture is much more scalable, therefore a
high throughput switching device can be built simply by increasing the number
of I/O ports. In addition, it can be used not only as a device to switch
classical information, but also a building block of quantum information
networks.
