Phase-Stable Free-Space Optical Lattices for Trapped Ions

Area of Science:

• Quantum optics
• Atomic physics
• Ion trapping

Background:

• Optical lattices are crucial for quantum technologies.
• Precise control over lattice phase is essential for advanced applications.
• Trapped ions serve as sensitive probes in quantum systems.

Purpose of the Study:

• To demonstrate absolute phase control of an optical lattice relative to a single trapped ion.
• To utilize this control for precise quantum operations and measurements.
• To investigate decoherence mechanisms affecting quantum states within the lattice.

Main Methods:

• Generating an optical lattice using off-resonant laser beams.
• Actively stabilizing the lattice phase by measuring the ac-Stark shift on a trapped ion.
• Localizing the ion within the lattice standing wave to <2% of its period.

Main Results:

• Achieved stable, phase-locked optical lattice.
• Demonstrated controlled displacement operations using resonant optical forces.
• Analyzed decoherence by observing lattice-induced phase evolution of spin superposition states.
• Inferred ion position variations with <6 nm accuracy over a 157 μm range.

Conclusions:

• Absolute phase control of optical lattices with trapped ions is feasible.
• This technique enables precise quantum state manipulation and high-accuracy metrology.
• Provides insights into decoherence pathways in ion-lattice systems.