Ultra-low-vibration closed-cycle cryogenic surface-electrode ion trap apparatus

Area of Science:

• Quantum Information Science
• Atomic, Molecular, and Optical (AMO) Physics
• Cryogenic Engineering

Background:

• Quantum processors require highly stable ion traps to minimize decoherence.
• Cryogenic environments are crucial for reducing thermal noise in quantum systems.
• Vibrations can disrupt ion trapping, limiting the performance of quantum devices.

Purpose of the Study:

• To design, commission, and operate an ultra-low-vibration closed-cycle cryogenic ion trap apparatus.
• To assess the vibration isolation performance of the cryogenic system.
• To demonstrate the trapping of beryllium ions (Be+) for potential quantum applications.

Main Methods:

• Utilized a closed-cycle cryogenic system with a helium exchange gas interface for vibration isolation.
• Incorporated 100 low-frequency signal lines and 8 coaxial feed-lines for control and readout.
• Employed a Michelson interferometer to characterize residual vibration amplitudes.
• Demonstrated ion trapping using laser ablation and photoionization techniques.

Main Results:

• Achieved an ultra-low-vibration environment with residual amplitudes on the order of 10 nm root mean square (rms).
• Maintained over 1.3 W of cooling power at 5 K with all supply cables attached.
• Successfully demonstrated the trapping of 9Be+ ions.

Conclusions:

• The developed cryogenic ion trap apparatus provides a stable platform for quantum information processing.
• The effective vibration isolation system is critical for achieving high-fidelity ion trapping.
• This apparatus is suitable for building small-scale ion-trap quantum processors or simulators.