Realization of optimized quantum controlled-logic gate based on the orbital angular momentum of light

Opt Express. 2016 Apr 18;24(8):8186-93. doi: 10.1364/OE.24.008186.

Abstract

We propose and experimentally demonstrate an optimized setup to implement quantum controlled-NOT operation using polarization and orbital angular momentum qubits. This device is more adaptive to inputs with various polarizations, and can work both in classical and quantum single-photon regime. The logic operations performed by such a setup not only possess high stability and polarization-free character, they can also be easily extended to deal with multi-qubit input states. As an example, the experimental implementation of generalized three-qubit Toffoli gate has been presented.