Multi Directional-Coupler Circuit for Quantum Logic

The previous chapter discussed quantum interference using waveguide directional couplers as an integrated version of a beam splitter. The beam splitter is one of the building blocks of any quantum optical technology, including linear optical quantum computing. In this chapter, we discuss the use of multiple directional couplers to create quantum optical logic. Specifically we demonstrate the use of two such coupler based logic gates in a single Silica-on-Silicon waveguide chip (see Sect. 2.4.2) to realise a proof of principle demonstration of a subroutine of Shor’s quantum factoring algorithm to factorize 15.

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