The cold neutron multilayer phase-spin echo interference experiment with mechanical alloying samples to investigate the state transition which derives decoherence

Abstract

It has not been solved theoretically and experimentally how to explain the process which derives decoherence from coherent state though certain interactions between a quantum system such as a neutron and mesoscopic system, which consists of many particles. It is still an open question how to explicate decoherence and the quantum process through the quantum mechanical measurement process. In the last few decades this subject has become more important and discussed in various fields. Many quantum mechanical measurement theories derive decoherence from coherent state without experimental verification. Theoretically, it seems already clear that a kind of fluctuation of the mesoscopic system derives decoherence. We have done interference experiments to study this phenomena using spin interferometer for cold neutron inserting such a mechanical alloying (MA) samples as Ni 25Ti 75 of different alloying time. We chose such samples as Ni and Ti so that the total potential becomes zero but the fluctuation of weighted structure factor remains. We study this system to find the phenomena decreasing the coherence of wave function after once it improves in a diffuse scattering component.