IMPLEMENTATION OF A SELECTIVE TWO-QUBIT GATE OPERATION IN A NEUTRAL ATOM QUANTUM COMPUTER

摘要

We consider a selective two-qubit gate operation in a neutral atom quantum computer. In this proposal neutral atoms are trapped by an array of near field Fresnel diffraction (NFFD) light with variable aperture size, by which the position of an atom can be controlled in a direction perpendicular to the aperture. Two-qubit gate operation between an arbitrary pair of atoms is implemented by sending these atoms to a one-dimensional optical lattice and then colliding a particular set of quantum states of these atoms. We analyze the two-qubit gate implementation in detail and obtain an upper bound of the gate operation time 7.87 ms with the corresponding fidelity 0.886.