Coupling ultracold atoms to a superconducting coplanar waveguide resonator

Area of Science:

• Quantum optics
• Atomic physics
• Solid-state physics

Background:

• Ensembles of trapped atoms interacting with on-chip microwave resonators are promising for quantum memories, quantum gates, and microwave-optical interfaces.
• Integrated atom chips offer a platform for precise control and interaction between atomic ensembles and superconducting circuits.

Purpose of the Study:

• To demonstrate the coupling between magnetically trapped ultracold Rubidium (Rb) atoms and a superconducting coplanar resonator.
• To explore methods for measuring microwave field strength and achieving coherent control of atomic states using the resonator.

Main Methods:

• Utilizing magnetically trapped ultracold Rb ground-state atoms.
• Employing a coherently driven superconducting coplanar resonator integrated on an atom chip.
• Measuring the AC shift of the atomic hyperfine transition frequency to determine microwave field strength.
• Observing Rabi oscillations between atomic hyperfine states when driving the cavity in resonance with the atoms.

Main Results:

• Demonstrated coupling between ultracold Rb atoms and a superconducting microwave resonator.
• Successfully measured microwave field strength via atomic AC shifts.
• Achieved coherent control of atomic hyperfine states through cavity field-induced Rabi oscillations.
• Showcased the preparation of coherent atomic superposition states.

Conclusions:

• The demonstrated coupling and control mechanisms are essential for building atomic quantum memories.
• This work highlights the potential of integrated atom-chip systems for quantum information processing.
• The ability to prepare coherent atomic superposition states is a critical step towards implementing robust quantum computing architectures.