The space cold atom interferometer for testing the equivalence principle in the China Space Station

Area of Science:

• Physics
• Astrophysics
• Quantum Mechanics

Background:

• The weak equivalence principle (WEP) is a cornerstone of physics.
• Atom interferometers (AIs) offer high precision for WEP tests.
• Microgravity environments enhance experimental accuracy.

Purpose of the Study:

• To design and realize a highly integrated payload for a dual-species cold rubidium atom interferometer.
• To conduct high-precision WEP tests in the microgravity scientific laboratory cabinet (MSLC) of the China Space Station (CSS).

Main Methods:

• Development of a compact, highly integrated dual-species cold rubidium atom interferometer payload.
• Utilizing the enhanced microgravity environment of the MSLC in the CSS.
• Ground-based testing to validate payload functionality and estimate space performance.

Main Results:

• Successful design and realization of the atom interferometer payload.
• Demonstration of payload functionality through ground tests.
• Estimation of expected high precision for WEP tests in space.

Conclusions:

• The designed atom interferometer payload is suitable for high-precision WEP tests in microgravity.
• The MSLC in the CSS provides an optimal environment for fundamental physics experiments.
• Future space experiments will push the boundaries of WEP testing precision.