Atomic Ramsey interferometry with S- and D-band in a triangular optical lattice

Area of Science:

• Quantum physics
• Atomic, molecular, and optical physics

Background:

• Ramsey interferometers are crucial in science and engineering.
• Interferometers utilizing external quantum states offer advantages over internal-state-based ones for quantum simulation and precision measurement.

Purpose of the Study:

• To develop a novel Ramsey interferometry technique using Bloch states in the S- and D-bands of a triangular optical lattice.
• To demonstrate the feasibility of this technique in a two-dimensionally coupled lattice system.

Main Methods:

• Utilized a shortcut method to construct a π/2 pulse for realizing Ramsey interferometry in a triangular optical lattice.
• Observed clear Ramsey fringes and analyzed the decoherence mechanisms.
• Implemented an echo π pulse between S- and D-bands to enhance coherence time.

Main Results:

• Successfully demonstrated Ramsey interferometry with Bloch states in a triangular optical lattice for the first time.
• Identified and analyzed decoherence mechanisms affecting the observed Ramsey fringes.
• Significantly improved coherence time through the application of an echo π pulse.

Conclusions:

• The developed Ramsey interferometer in a dimensionally coupled lattice is a significant advancement.
• This technique shows potential for quantum simulations of topological physics, frustrated effects, and motional qubit manipulation.
• The use of external quantum states and advanced pulse techniques offers new possibilities in quantum technologies.