Abstract

The main advantages of using photons to implement quantum computation are their robustness against decoherence and the availability of single-qubit operations. To realize quantum operations for photons, optical Controlled-NOT (C-NOT) gates are key devices. We have proposed a compact C-NOT gate without path interference, in which just three partialty polarizing beam splitters (PPBSs) are used (Figure 1) [1]. In our experimental demonstration, the quantum process fidelity was estimated to be 0.72 < F_process < 0.85 [1]. To increase the number of C-NOT gates in a more complicated quantum circuit, minimizing the error is crucial.

© 2007 IEEE