Producing directed migration with correlated atoms in a tilted ac-driven lattice

Abstract

The correlated atoms in a tilted optical lattice driven by an ac-field are studied within the Hubbard model. By making use of both the photon-assisted tunneling and coherent destructive tunneling effects, we can move a pair of strongly correlated atoms in the lattice via manipulating the global amplitude of the driving field. We propose a scheme of creating entanglement between the particlepair and a single particle through interacting oscillations. Our model may provide a new building block for investigating quantum computing and quantum information processing with ultracold atoms in optical lattices.

Coherent control of quasi-degenerate stationary-like states via multiple resonances

“…We also expect possible applications of the scheme to the preparation of robust quantum entangled states and to the quantum information processing. In fact, a double-well trapped many-boson system can be divided into two subsystems A and B and the corresponding bipartite entangled states have been investigated 19 – 21 , which can be used to encode the qubit 22 . Noticing the indistinguishability of identical bosons, we can divide the considered three-boson system into the subsystem A of a single-boson and subsystem B of a pair-boson.…”

“…A double-well trapped many-boson system or an atomic Bose-Einstein condensates (BEC) in two different hyperfine states trapped in a single trap can be treated as a bipartite system of two modes 19 – 21 . The bipartite entangled states in such a system have been investigated, which can be used to encode the qubit 22 . As a maximal bipartite entangled state the NOON state has also been widely studied 22 , 23 .…”

“…The bipartite entangled states in such a system have been investigated, which can be used to encode the qubit 22 . As a maximal bipartite entangled state the NOON state has also been widely studied 22 , 23 . In order to eliminate the adverse decoherence arising from the spontaneous transitions, we hope to seek the quasi-degenerate bipartite states associated with the same energy 24 and with the different external fields, and to control the transitions between them by adjusting the field parameters.…”

Controllable movement and entanglement of atoms on an optical lattice

“…The high tunability of optical lattices also provides an ideal platform for periodically driven systems which lead to various effective Hamiltonians based on the Floquet theory [11]. The dynamical localization (DL) [12,13], photonassisted tunneling [14] as well as coherent destructive tunneling (CDT) [15][16][17][18] were utilized to induce the superfluid to Mott insulator transition [19][20][21], quantum control of selective tunneling [22,23], directed migration of atoms or the creation of quantum entanglement [24,25], etc.…”

“…In recent works, we have proposed several ways to manipulate directed motion in optical lattices by doubly driving the optical lattices or tilting the lattice with a single AC field [24,25]. In [22], the authors suggested the realization of directed motion of a Bose condensate in a bipartite superlattice by making use of the CDT with a modulated driving field.…”