We present the measurements and calculations of the absolute total collision cross sections for a room-temperature gas of helium using^(87)Rb atoms confined in either a magneto-optic or a magnetic quadrupole trap.The ...We present the measurements and calculations of the absolute total collision cross sections for a room-temperature gas of helium using^(87)Rb atoms confined in either a magneto-optic or a magnetic quadrupole trap.The loss rates from the magneto-optic trap and the pure magnetic trap are compared and show significant differences.The collision cross sections as a function of trap depth for helium gas are obtained.These findings are significant for extracting the information about the different cross sections when the trap depth is changed.展开更多
We consider a model which consists of two coupled superconducting charge qubits by sharing a large Josephson junction.The time evolution of entanglement between two Josephson charge qubits is investigated by employing...We consider a model which consists of two coupled superconducting charge qubits by sharing a large Josephson junction.The time evolution of entanglement between two Josephson charge qubits is investigated by employing the concurrence.We examine the influence of the initial mean photon number,the relative phase and the amplitude of the two qubits on the time evolution of entanglement.The results show that the initial mean photon number,the relative phase and the amplitude of the two qubits play an important role in the evolution of entanglement.展开更多
We announce the withdrawal of the article entitled“Measurement of Absolute Atomic Collision Cross Section with Helium Using 87Rb Atoms Confined in Magneto-Optic and Magnetic Traps”,which was published in Chinese Phy...We announce the withdrawal of the article entitled“Measurement of Absolute Atomic Collision Cross Section with Helium Using 87Rb Atoms Confined in Magneto-Optic and Magnetic Traps”,which was published in Chinese Physics Letters[28(4)(2011)043401].The first author,Jicheng Wang,had participated in related research with Professor Kirk Madison’s group at the Department of Physics&Astronomy at the University of British Columbia,Canada from September 2008 to February 2010.Even though consent had been granted for some of the experimental data to be used by Jicheng Wang in his own thesis,its publication had not been authorized.We apologize to Professor K.Madison for the misunderstanding,and to Chinese Physics Letters and the readers of Chinese Physics Letters for any inconvenience this mistake may have caused.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB301801the National Natural Science Foundation of China under Grant No 10974039jointly supported by the State Scholarship of the China Scholarship Council for Study Abroad.
文摘We present the measurements and calculations of the absolute total collision cross sections for a room-temperature gas of helium using^(87)Rb atoms confined in either a magneto-optic or a magnetic quadrupole trap.The loss rates from the magneto-optic trap and the pure magnetic trap are compared and show significant differences.The collision cross sections as a function of trap depth for helium gas are obtained.These findings are significant for extracting the information about the different cross sections when the trap depth is changed.
基金by the National Basic Research Program of China under Grant No 2011CB301801 and the National Natural Science Foundation of China under Grant No 10974039.
文摘We consider a model which consists of two coupled superconducting charge qubits by sharing a large Josephson junction.The time evolution of entanglement between two Josephson charge qubits is investigated by employing the concurrence.We examine the influence of the initial mean photon number,the relative phase and the amplitude of the two qubits on the time evolution of entanglement.The results show that the initial mean photon number,the relative phase and the amplitude of the two qubits play an important role in the evolution of entanglement.
文摘We announce the withdrawal of the article entitled“Measurement of Absolute Atomic Collision Cross Section with Helium Using 87Rb Atoms Confined in Magneto-Optic and Magnetic Traps”,which was published in Chinese Physics Letters[28(4)(2011)043401].The first author,Jicheng Wang,had participated in related research with Professor Kirk Madison’s group at the Department of Physics&Astronomy at the University of British Columbia,Canada from September 2008 to February 2010.Even though consent had been granted for some of the experimental data to be used by Jicheng Wang in his own thesis,its publication had not been authorized.We apologize to Professor K.Madison for the misunderstanding,and to Chinese Physics Letters and the readers of Chinese Physics Letters for any inconvenience this mistake may have caused.
