研究目的
Investigating the quantum correlations and EPR steering between two condensate modes of a Bose-Einstein condensate interferometer involving a large number of atoms.
研究成果
The study presents experimental evidence for two-mode entangled states involving 40,000 87Rb atoms and demonstrates two-way steerability between two groups of 20,000 indistinguishable atoms. The results are significant for understanding quantum correlations in mesoscopic systems and have implications for quantum information tasks.
研究不足
The study is limited by the technical challenges of preparing and maintaining a pure two-mode entangled state with a large number of atoms, and the influence of thermal atoms on the measured fringe contrast.
1：Experimental Design and Method Selection:
The study uses a Bose-Einstein condensate interferometer to analyze quantum correlations between two condensate modes. A multimode theory is developed to describe the dynamics of condensate atoms and the thermal fraction through the interferometer sequence.
2：Sample Selection and Data Sources:
The experiment involves a multimode 87Rb BEC Ramsey interferometer of ~55,000 atoms at a temperature of ~37 nK, prepared on an atom chip in a magnetic trap.
3：List of Experimental Equipment and Materials:
The setup includes an atom chip, magnetic trap, and microwave pulses for creating and manipulating the two-component BEC.
4：Experimental Procedures and Operational Workflow:
The experiment involves preparing the BEC, applying microwave pulses to create entangled states, and measuring the population difference after an evolution time to infer quantum correlations.
5：Data Analysis Methods:
The fringe visibility from the interferometer is used to infer the two-mode moment, and a lower bound on the number of atoms in the steerable state is calculated.
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