摘要
Quantum coherence is the most distinct feature of quantum mechanics.However,inevitable decoherence processes will finally destroy it and make the"Schrödinger's cat"invisible in our classical world.In this"quantum-to-classical transition",the so-called"largeness"plays a critical role.We experimentally study the largeness phenomena in the bipartite entanglement decay process through a depolarizing channel with two-photon entangled states generated from a spontaneous parametric down-conversion source.Our experiment demonstrates how the speed of entanglement decay and the time when"entanglement sudden death"happens depend on the size of the system exposed to the environment noise.
基金
by the National Basic Research Program of China under Grant No 2011CB921200
the National Natural Science Foundation of China under Grant Nos 11074242 and 10874162
the Knowledge Innovation Project of Chinese Academy of Sciences
the Program for New Century Excellent Talents in University
the International Cooperation Program from CAS and the Ministry of Science and Technology of China
the Foundation for the Author of National Excellent Doctoral Dissertation of of China under Grant No 200729.
