Shortcut loading atoms into an optical lattice

Abstract

We present an effective and fast (few microseconds) procedure for transferring ultra-cold atoms from the ground state in a harmonic trap into the desired bands of an optical lattice. Our shortcut method is a designed pulse sequence where the time duration and the interval in each step are fully optimized in order to maximize robustness and fidelity of the final state with respect to the target state. The atoms can be prepared in a single band with even or odd parity, and superposition states of different bands can be prepared and manipulated. Furthermore, we extend this idea to the case of two-dimensional or three-dimensional optical lattices where the energies of excited states are degenerate. We experimentally demonstrate various examples and show very good agreement with the theoretical model. Efficient shortcut methods will find applications in the preparation of quantum systems, in quantum information processing, in precise measurement and as a starting point to investigate dynamics in excited bands.

23 pages, 15 figures

References in corpus (9)

• Many-Body Physics with Ultracold Gases
• Atom Interferometers
• Orbital superfluidity in the $P$-band of a bipartite optical square lattice
• Dynamical Creation of Fractionalized Vortices and Vortex Lattices
• State preparation and dynamics of ultracold atoms in higher lattice orbitals
• Shortcut to adiabaticity for an interacting Bose-Einstein condensate
• Prediction of quantum stripe ordering in optical lattices
• High-fidelity rapid ground-state loading of an ultracold gas into an optical lattice
• Atomic momentum patterns with narrower interval

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