One-way quantum computing in optical lattices with many atom addressing

TL;DR

This paper demonstrates that one-way quantum computing with ultracold atoms in optical lattices is feasible despite laser width limitations, by using precise beam positioning and compensation techniques for accidental measurements.

Contribution

It introduces a method allowing deterministic 1WQC in optical lattices with high-accuracy beam positioning, overcoming previous measurement challenges.

Findings

Deterministic 1WQC is possible with polynomially increased operations.

High-precision beam positioning enables sequential measurements on isolated qubits.

The scheme can compensate for accidental measurements of nearby qubits.

Abstract

One of the fundamental conditions for one-way quantum computation (1WQC) is the ability to make sequential measurements on isolated qubits that comprise the highly entangled resource for 1WQC, the cluster state. This has been a significant impediment in the implementation of 1WQC with ultracold atoms confined in optical lattices, because the width of the measuring lasers is generally much greater than the atomic (qubit) spacing. We demonstrate that deterministic 1WQC is nevertheless possible, with a polynomial increase in the number of operations, as long as the center of the beams can be positioned with high accuracy. Extending the number of cluster atoms, the scheme is also able to compensate for accidental measurements of an arbitrary number of nearby qubits.