The Quantum Information Processing Based On The Dipole Blockade Mechanism Of The Rydberg Atoms

Since the1980s, the combination of quantum mechanics,and information science forms a newly cross discipline——quantuminformation science. Its birth and development have greatly enriched the content of the original quantum theory, have deepened the connotation of the basic principles of quantum mechanics, and have further verified the scientific of the quantum theory. Quantum entanglement is an unique characteristic of quantum mechanics and the basic physical resource for quantum communication and quantum computing. Most of previous protocols are discussed based on two-dimensional quantum systems,. Recently, people started to pay attention to multi-dimensional quantum system. Studies have shown that schemes based on multi-dimensional system have more advantages than that based on two-dimensional system. Therefore, the preparation of multi-dimensional entanglement state is a crucial job.Because of its unique physical nature in external field, neutral Rydberg atom has become an important physical realization system after the ion trap system. The proposals based on Rydberg dipole blockade have got a crucial progresses in theory and experiment in recent years due to its unique advantages for implementing quantum information process. Hence, it is valuable for researching quantum information process based on Rydberg dipole blockade. The main work is listed below:1、Realization of entanglement swapping using the dipole blockade mechanism. A scheme is proposed for realizing the entanglement swapping among atoms via the strong dipole interaction between Rydberg atoms. The probability of success of the proposal is close to1due to deterministic Rydberg gate. Only laser operation on Rydberg atom is needed throughout the process. Compared with the previous protocols, the scheme is much easier and more feasible in experimental operation.2、Generation of two-atom and three-atom three-dimentional entangled states using the dipole blockade mechanism. Two neutral atoms are embeded into the photonic lattice. Then seven laser pulses are orderly operating on Rydberg atoms. The two-atom three-dimentional entangled state is prepared via the control of pulse frequency and the interaction time. The scheme is extended to creat three-atom three-dimentional entangled state. Finally, the experimental feasibility of the protocol is discussed under the present conditions.