Implementation of Quantum Walks

　东南大学物理系

Abstract:

　  First I will talk about the impact of decoherence and disorder on the dynamics of discrete quantum walks and simulate different environment influences on quantum walks resulting in a ballistic spread, Anderson localization and a diffusive random walk. Then I will also talk about how single- and multi-particle quantum walks can be implemented with different physical systems such as ion trap, linear optics and cavity quantum electrodynamics. The implementation of a quantum walk with single- and multi-particle opens up the interesting possibility to introduce entanglement and more advanced walks. With different coin tosses and initial states the quantum walks show different probability distributions which deviate strongly from the classical random walk with quadratic enhanced spreadings and localization effects. By introducing controllable decoherence, the transition from quantum walks to the classical version is observed.