Quantum computation using neutral atoms


Scalable quantum computation using neutral atoms in optical lattices

Our experimental scheme uses two species of cold neutral atoms trapped in overlapping optical lattices as a basis for quantum computation [Brickman et al. New Journal of Physics 11 055022 (2009) arXiv:0812.1606 ].

Fermionic Li-6 atoms trapped one atom per lattice site act as qubits.

Cs-133 atoms, sparsely populated in an overlapping, but independently controllable lattice, are used as messenger qubits, or a quantum read/write head in order to perform operations (gates) mediated by interatomic contact interaction.

Cs Messenger Atom Translation for Operations Across the Li Qubit Lattice

   

Ground electronic state hyperfine sublevels are used as qubit states (0 and 1). Using internal states in neutral atoms as qubit states allows for manipulation using optical and radio-frequency radiation without suffering from a large susceptibility to environmental noise. The control over external degrees of freedom as well allows for trapping and cooling.

Both species need to be trapped and cooled in order to achieve precise, coherent control over quantum information.