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Atomtronics: Coherent Control of Atomic Flow via Adiabatic Passage
Published in Xavier Oriols, Jordi Mompart, Applied Bohmian Mechanics, 2019
Albert Benseny, Joan Bagudà, Xavier Oriols, Gerhard Birkl, Jordi Mompart
Quantum gases trapped in optical potentials [4–7], e.g., microtrap arrays or optical lattices, have attracted considerable attention since they fulfill all the basic requirements for quantum information processing [44]. Quantum registers with single-site addressing of about a hundred of qubits [4] and cluster-entangled states of thousands of atoms [6] have been reported, respectively, in 2D optical microtrap arrays and 3D optical lattices. Furthermore, the loading of quantum gases into three-dimensional (3D) optical lattices, achieving the Mott insulator regime with ideally one atom per site for both bosons [45] and fermions [46], has been experimentally demonstrated, reaching one of the main goals for quantum information processing with neutral atoms. In most quantum computation proposals with trapped neutral atoms, a defect-free quantum system (where all sites of the lattice are occupied by exactly one atom) is needed to start the information processing. Therefore, it is necessary to remove empty sites from the physical area of computation.
Tunable External Cavity Diode Lasers
Published in Barat Ken, Laser Safety Tools and Training, 2017
Optical Lattices: Laser-trapped atoms comprise a useful platform for quantum computing.8 Interference of counter-propagating laser beams can form a light field with periodic potentials. Through laser cooling and repumping optical excitations, certain atoms in a localized quantum state can be prepared. The periodic potentials in the light field form what is called optical lattice traps, which are populated with single atoms as the lattice potential depth is increased through various techniques. Each atom can be thought of as occupying a qubit state and can be manipulated (Figure 22.6). The phenomenon of interest is the quantum interactions between these atoms.9 The coherent quantum behavior of these trapped atoms has also improved the accuracy of atomic clocks in the past few years.10
Laser cooling of rubidium atoms in a 2D optical lattice
Published in Journal of Modern Optics, 2018
Chunhua Wei, Carlos C. N. Kuhn
The geometric setup to generate the optical lattice potential is shown in Figure 3. The ECDL used to generate the lattice is amplified and spatially filtered through of PMSM fibre. A home built wavemeter is added to accurately detune the laser from the transition [29]. The laser can be locked at any frequency using a software implementation of a proportional integral derivative (PID) controller and is experimentally simple to implement, requiring only of light coupled into the wavemeter fibre from the back of the Saturated Absorption Spectroscopy (SAS) beam splitter. In order to avoid spontaneous emission heating of the cold atoms, the optical lattice is typically set to be detuned to the red of the transition.