One-dimensional ultracold medium of extreme optical depth

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Optics
• Materials Science

Background:

• Creating ultracold atomic samples is crucial for advancements in quantum technologies.
• Hollow-core photonic crystal fibers offer unique environments for atom manipulation.
• Achieving high optical depth in confined atomic systems remains a challenge.

Purpose of the Study:

• To prepare a one-dimensional ultracold atomic medium with a significant effective optical depth.
• To investigate the feasibility of using hollow-core photonic crystal fibers for ultracold atom generation.
• To explore the potential of such a medium for quantum and nonlinear optics applications.

Main Methods:

• Atoms were transferred from a magneto-optical trap to a far-detuned optical dipole trap.
• The experiment utilized a hollow-core photonic crystal fiber to confine the atoms.
• The effective optical depth and atom number were precisely measured.

Main Results:

• A one-dimensional ultracold medium was successfully prepared within the fiber.
• An effective optical depth of 1000(150) was achieved, a record for such systems.
• Up to 2.5(3)×10^5 atoms were loaded into the fiber core with 2.5(6)% efficiency.

Conclusions:

• The preparation of an ultracold medium with extremely high optical depth in a hollow-core fiber is demonstrated.
• This work opens avenues for novel quantum optics and nonlinear optics experiments.
• The developed technique offers a promising platform for future quantum device development.