Quantum nondemolition measurement based generation of entangled states in two Bose-Einstein condensates

被引:9
作者
Aristizabal-Zuluaga, Juan E. [1 ,2 ,3 ]
Skobleva, Iuliia [2 ]
Richter, Lars [2 ]
Ju, Yangxu [1 ,2 ]
Mao, Yuping [1 ,2 ]
Kondappan, Manikandan [1 ,2 ]
Ivannikov, Valentin [1 ,2 ,4 ]
Byrnes, Tim [1 ,2 ,4 ,5 ,6 ]
机构
[1] East China Normal Univ, State Key Lab Precis Spect, Shanghai 200062, Peoples R China
[2] New York Univ Shanghai, 1555 Century Ave, Shanghai 200122, Peoples R China
[3] Univ Antioquia UdeA, Fac Ciencias Exactas & Nat, Inst Fis, Grp Fis Atom & Mol, Calle 70 52-21, Medellin, Colombia
[4] NYU Shanghai, NYU ECNU Inst Phys, 3663 Zhongshan Rd North, Shanghai 200062, Peoples R China
[5] Natl Inst Informat, Chiyoda Ku, 2-1-2 Hitotsubashi, Tokyo 1018430, Japan
[6] NYU, Dept Phys, New York, NY 10003 USA
基金
中国国家自然科学基金;
关键词
Bose-Einstein condensate; Einstein-Podolsky-Rosen steering; Bell-CHSH correlations; Mach-Zehnder interferometer; SQUEEZED STATES; BACK-ACTION; ATOMS; FLUCTUATIONS; MANIPULATION; INFORMATION; ENSEMBLE; NOISE; LIGHT;
D O I
10.1088/1361-6455/abf6b5
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We theoretically study a scheme for generating entanglement between two Bose-Einstein condensates (BECs). The scheme involves placing two BECs in the path of a Mach-Zehnder interferometer, where the coherent light interacts with the atoms due to a quantum nondemolition Hamiltonian. In contrast to standard approaches where a Holstein-Primakoff approximation is used, we use an exact wavefunction approach where the atoms can be initialized in an arbitrary state and the light-atom interaction times can be arbitrary. In the short time regime, it is possible to construct a very simple approximate theory for the overall effect of the scheme: amplitudes in the superposition between the two BECs with unequal spin eigenvalues are damped. We analyze the types of correlations, entanglement, Einstein-Podolsky-Rosen (EPR) steering, and Bell correlations that are produced and show that the state is similar to a spin-EPR state. Using a two-pulse sequence the correlations can be dramatically improved, where the state further approaches a spin-EPR state.
引用
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页数:18
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