Correlations and counting statistics of an atom laser

Area of Science:

• Atomic physics
• Quantum optics
• Condensate science

Background:

• Bose-Einstein condensates (BECs) are quantum states of matter with unique properties.
• Controlling and detecting single atoms from BECs is crucial for quantum technologies.
• Atom lasers, coherent beams of atoms, are generated from BECs.

Purpose of the Study:

• To demonstrate time-resolved single-atom counting from a BEC.
• To investigate the statistical properties of atom laser beams.
• To compare the statistics of monoenergetic and pseudothermal atomic beams.

Main Methods:

• Utilizing a high-finesse optical cavity for single-atom detection.
• Implementing time-resolved atom counting techniques.
• Performing Hanbury Brown-Twiss experiments to measure the second-order correlation function, g((2))(tau).

Main Results:

• Successfully detected individual atom transits from a 87Rb BEC.
• Measured g((2))(tau) for a monoenergetic atom laser, yielding a value close to 1, indicating Poissonian statistics.
• Observed bunching behavior (g((2))(tau) > 1) for a pseudothermal atomic beam, consistent with Bose-Einstein statistics.

Conclusions:

• The study demonstrates precise control and detection of single atoms from BECs.
• The results confirm the non-classical nature of monoenergetic atom lasers.
• The findings provide insights into atom statistics, relevant for quantum information processing and atom optics.