2007/09/30 by Oriol Romero‐Isart, Oriol Romero-Isart, Juan José García‐Ripoll +1 · 3 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Spectroscopy and Quantum Chemical Studies #cond-mat.other #quant-ph #stochastic dynamics and bifurcation
paper · pdf · doi:10.1103/physreva.76.052304
published as Physical Review A 76, 052304 (2007) · Published version, 9 pages, 5 figures
openalex publication_date 2007/11/06 · arxiv created 2007/11/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose to use a quantum ratchet to transport quantum information in a chain of atoms trapped in an optical superlattice. The quantum ratchet is created by a continuous modulation of the optical superlattice which is periodic in time and in space. Though there is zero average force acting on the atoms, we show that indeed the ratchet effect permits atoms on even and odd sites to move along opposite directions. By loading the optical lattice with two-level bosonic atoms, this scheme permits us to perfectly transport a qubit or entangled state imprinted in one or more atoms to any desired position in the lattice. From the quantum computation point of view, the transport is achieved by a smooth concatenation of perfect swap gates. We analyze setups with noninteracting and interacting particles and in the latter case we use the tools of optimal control to design optimal modulations. We also discuss the feasibility of this method in current experiments.