Integrated photonics can be written in glass through nonlinear absorption by focusing a short-pulse-duration laser into the glass; quantum-integrated- photonics (QIP) devices are being fabricated using this technique. The small size offered by integrated optics is of course also crucial to taking experiments out of laboratories and producing practical technologies. These on-chip optical circuits operate primarily by the process of total internal reflection. A fundamental theorem, called the 'no-cloning' theorem, precludes the amplification of quantum information; as a result, every photon in a quantum-information system is precious. An alternative technique to developing waveguides in glass is called the femtosecond laser direct-write (FLDW) technique. This exploits a nonlinear-absorption process that occurs at high laser intensities in a transparent material. Because of the potential to interface multiple different device platforms, it is likely that future small-scale quantum circuits will exploit the convenience of laser-written devices.
|Number of pages||4|
|Journal||Laser Focus World|
|Publication status||Published - 2014|