In ion traps, entangling gate operations can be realized by a bichromatic pair of laser beams that collectively interact with the ions. In this paper, a new method of modelling the laser-ion interaction is introduced that turns out to be superior to standard techniques for the description of gate operations on optical qubits. The treatment allows for a comparison of the performance of gates bas...

Universal quantum logic gates are important elements for a quantum computer. In contrast to previous constructions on one degree of freedom (DOF) of quantum systems, we investigate the possibility of parallel quantum computations dependent on two DOFs of photon systems. We construct deterministic hyper-controlled-not (hyper-CNOT) gates operating on the spatial-mode and the polarization DOFs of ...

We propose a new system for implementing quantum logic gates: neutral atoms trapped in a very far-off-resonance optical lattice. Pairs of atoms are made to occupy the same well by varying the polarization of the trapping lasers, and then a near-resonant electric dipole is induced by an auxiliary laser. A controlled-NOT can be implemented by conditioning the target atomic resonance on a resolvab...

The IST-LASAGNE project [1], investigates all-optical label swapping employing optical logic gates in network nodes: in other words, the intention is not only to switch the payload of a burst or packet optically, but also to process the accompanying header in the optical domain. All-optical packet-switching forms in that way the logical evolution of optical packet-switched (OPS) networks. It ov...

Optical enantiomers are proposed to encode molecular two-qubit information processing. Using sequences of pairs of nonresonant optimally polarized pulses, different schemes to implement quantum gates, and to prepare entangled states, are described. We discuss the role of the entanglement phase and the robustness of the pulse sequences which depend on the area theorem. Finally, possible scenario...

In this paper, the nonlinear effect of Kerr on increasing efficiency multi-channel all-optical metal-insulator-metal logic gates with heterogeneous metals is investigated. study, linear interference between surface plasmonic polariton modes has been employed. The performance OR, AND, XOR and NOR numerically analyzed by finite element method. A structure fixed physical dimensions can manage seve...