The Time Optimization Of Dynamically Error-corrected Quantum Gates And Experimental Verification

Based on the principles of quantum mechanics, quantum information process, in recent years, got more and more people’s attention. Up to now, it has been experimentally realized in many different physical system, in which Nuclear Magnetic Resonance (NMR) system is one of the most mature technology. By designing suitable RF pulse, the main process of NMR quantum information and quantum computation, such as preparation of the initial state、quantum logic gates and the final result reading-out could be realized. At present, many kinds of quantum information processing have been verified in NMR system.Generally, for the reason that any physical system is always coupling with environment, then the implementation of quantum information processing is normally influenced by decoherence. Up to now, many kinds of methods have been proposed for eliminating decoherence, such as, optimal control method which reducing the time duration of unitary transformation. In addition, dynamically corrected gates encoding of quantum logic gates would be used to reduce or avoid decoherence. In this article we combine the time optimal quantum control strategy with dynamically corrected gates techniques, then propose a new method for building unitary transformation which is decoherence free. This method is experimentally validated in NMR system. And then we apply this method in the preparation of cluster state. The experiment result prove its availability. Here we also optimize the quantum QFT gate on Ising coupling system, our experiment results show its duration could be decreased apparently.In the end, we present an experimental implementation of remote state preparation by using GHZ entangled state.