Modulation of controlled-not gate using light beams carrying orbital angular momentum in a nonlinear atomic vapor

¹ School of Physics and Optoelectronic Engineering, Xidian University - Xi'an, Shaanxi 710071, China
² Atomic and Molecular Physics Key Discipline in Shaan'xi Province, School of Mechanical and Material Engineering Xi'an University - Xi'an, Shaanxi 710065, China

Received: 7 February 2018
Accepted: 3 April 2018

Abstract

We propose and experimentally demonstrate a controlled-not gate with light beams carrying orbital angular momentum (OAM) through a degenerate four-wave mixing process via a photonic band gap structure satisfying the phase-matching condition. By employing the different topological charges of a Laguerre-Gaussian beam as a qubit in this nonlinear process, the controlled-not gate with OAM can be realized. Moreover, we investigate the evolution of the controlled-not gate, which can be modulated by the frequency and the power of the incident beam, i.e., under electromagnetically induced transparency conditions. The study results are useful for applications in quantum communication and information storage.