Two-dimensional transport and transfer of a single atomic qubit in optical tweezers

Jérôme Beugnon (1) , Charles Tuchendler (1) , Harold Marion (1) , Alpha Gaëtan (1) , Yevhen Miroshnychenko (1) , Yvan R. P. Sortais (1) , Andrew Matheson Lance (1) , Matthew P.A. Jones (1) , Gaétan Messin (1) , Antoine Browaeys (1) , Philippe Grangier (1)

1 Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique

Quantum computers have the capability of out-performing their classical counterparts for certain computational problems. Several scalable quantum-computing architectures have been proposed. An attractive architecture is a large set of physically independent qubits arranged in three spatial regions where (1) the initialized qubits are stored in a register, (2) two qubits are brought together to realize a gate and (3) the readout of the qubits is carried out. For a neutral-atom-based architecture, a natural way to connect these regions is to use optical tweezers to move qubits within the system. In this letter we demonstrate the coherent transport of a qubit, encoded on an atom trapped in a submicrometre tweezer, over a distance typical of the separation between atoms in an array of optical traps. Furthermore, we transfer a qubit between two tweezers, and show that this manipulation also preserves the coherence of the qubit.

Domaines: Physique Quantique [quant-ph]

Jérôme Beugnon, Charles Tuchendler, Harold Marion, Alpha Gaëtan, Yevhen Miroshnychenko, et al.. Two-dimensional transport and transfer of a single atomic qubit in optical tweezers. Nature Physics, 2007, 3, pp.696. ⟨10.1038/nphys698⟩. ⟨hal-00509079⟩