Scalable Neutral Atom Quantum Computer with Interaction on Demand: Proposal for Selective Application of Two-Qubit Gate

TL;DR

This paper proposes a scalable neutral atom quantum computer that uses selective two-qubit gates via controlled collisions, enabling on-demand interactions with high fidelity, feasible with current technology.

Contribution

It introduces a novel method for implementing scalable quantum computing with neutral atoms using selective collision-based two-qubit gates.

Findings

Estimated two-qubit gate operation time and fidelity.

Feasibility demonstrated with current cold atom and nanolithography technology.

Proposed system supports scalable quantum computing architecture.

Abstract

We propose a scalable neutral atom quantum computer with an on-demand interaction through a selective two-qubit gate operation. Atoms are trapped by a lattice of near field Fresnel diffraction lights so that each trap captures a single atom. One-qubit gate operation is implemented by a gate control laser beam which is applied to an individual atom. Two-qubit gate operation between an arbitrary pair of atoms is implemented by sending these atoms to a state-dependent optical lattice and making them collide so that a particular two-qubit state acquires a dynamical phase. We give numerical evaluations corresponding to these processes, from which we estimate the upper bound of a two-qubit gate operation time and corresponding gate fidelity. Our proposal is feasible within currently available technology developed in cold atom gas, MEMS, nanolithography, and various areas in optics.