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AIP conference proceedings

Cold atom ballistics by coherent control

L. E. Reichl, Benjamin P. Holder, Paweł Danielewicz, Piotr Piecuch B, Vladimir Zelevinsky

Published Jan 1, 2008• 0 citations
Publisher

Abstract

We use the technique of Stimulated Raman adiabatic passage (STIRAP) to affect transport of ultracold atoms between two optical lattices in relative motion. We show, using Floquet analysis and degenerate perturbation theory, that the dynamics of atoms in a particular time‐dependent optical lattice system can be reduced to the 3‐level STIRAP model, allowing for a simple description of their coherent acceleration.

DOI
10.1063/1.2915609

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We use the technique of Stimulated Raman adiabatic passage (STIRAP) to affect transport of ultracold atoms between two optical lattices in relative motion. We show, using Floquet analysis and degenerate perturbation theory, that the dynamics of atoms in a particular time‐dependent optical lattice system can be reduced to the 3‐level STIRAP model, allowing for a simple description of their coherent acceleration.
We introduce a method for the coherent acceleration of atoms trapped in an optical lattice, using the well-known model for stimulated Raman adiabatic passage (STIRAP). Specifically, we show that small harmonic modulations of the optical lattice amplitude, with frequencies tuned to the eigenvalue spacings of three ``unperturbed'' eigenstates, reveals a three-state STIRAP subsystem. We use this model to realize an experimentally achievable method for transferring trapped atoms from stationary to motional eigenstates.
We describe a technique for transferring a two-level atom between two adjacent potential wells of an optical lattice, using pairs of pump and Stokes pulses, each resonantly coupling the same pair of internal atomic states to form a Raman transition. Starting from a vibrational eigenstate of one well the atom slowly moves under the action of the pulse pair, to the vibrational eigenstate with the same quantum number in the neighboring well. The transfer takes place in two stages: A conventional stimulated Raman adiabatic passage (STIRAP) technique, in which Stokes precedes pump pulse, is followed by a pulse sequence where pump precedes Stokes and with an inverted sign of the Stokes envelope. In the first step the atom is accelerated toward the adjacent well and in the second step decelerated to the initial vibrational energy. The STIRAP technique avoids the introduction of stochastic motion caused by spontaneous emission from the excited internal atomic state.
The generation of ultracold molecules has been a hot topic in cold atom-molecule physics.It is difficult to obtain ultracold molecules with laser cooling as in the atomic system,because there are more degrees of freedom in molecules,and the level structure is denser and more complicated. For the time being,the ultracold molecules are generally generated from the ultracold atoms coupled by the external fields.The stimulated Raman adiabatic passage process(STIRAP) as an effective method of generating ultracold molecules from its atomic counterparts has been widely studied.In this article,we mainly focus on the recent research progress of dynamics,adiabaticity and instability of the dark state in the atom-molecule STIRAP.
We investigate coherent atomic tunneling of a dilute gas Bose-Einstein condensate (BEC) in a three-well system. In particular, we generalize stimulated Raman adiabatic passage (STIRAP) to adiabatically transport a BEC of 2000 7Li^{7}\mathrm{Li}7Li atoms between two wells with minimal occupation in the intervening well. This protocol paves the way for a robust method of control in atom-optical devices.
Accurate control of a quantum system is a fundamental requirement in many areas of modern science ranging from quantum information processing to high-precision measurements. A significantly important goal in quantum control is preparing a desired state as fast as possible, with sufficiently high fidelity allowed by available resources and experimental constraints. Stimulated Raman adiabatic passage (STIRAP) is a robust way to realize high-fidelity state transfer but it requires a sufficiently long operation time to satisfy the adiabatic criteria. Here we theoretically propose and then experimentally demonstrate a shortcut-to-adiabatic protocol to speed-up the STIRAP. By modifying the shapes of the Raman pulses, we experimentally realize a fast and high-fidelity stimulated Raman shortcut-to-adiabatic passage that is robust against control parameter variations. The all-optical, robust and fast protocol demonstrated here provides an efficient and practical way to control quantum systems.