Geometric Manipulation of Ensembles of Atoms on Atom Chip for Quantum Computation

TL;DR

This paper presents a scheme for quantum computation using geometric manipulation of atomic ensembles on an atom chip, leveraging Rydberg states and dipole interactions to implement universal quantum gates with error protection.

Contribution

It introduces a novel geometric approach for quantum gates on atom chips using Rydberg states, enhancing error resilience and gate fidelity.

Findings

Numerical simulations show high gate fidelity.

Geometric manipulation offers protection against laser and cavity losses.

The scheme is feasible with current atom chip technology.

Abstract

We propose a feasible scheme to achieve quantum computation based on geometric manipulation of ensembles of atoms, and analyze it for neutral rubidium atoms magnetically trapped in planoconcave microcavities on an atom chip. The geometric operations are accomplished by optical excitation of a single atom into a Rydberg state in a constant electric field. Strong dipole-dipole interactions and incident lasers drive the dark state of the atom ensembles to undergo cyclic evolutions that realize a universal set of quantum gates. Such geometric manipulation turns out naturally to protect the qubits from the errors induced by non-uniform laser illumination as well as cavity loss. The gate performance and decoherence processes are assessed by numerical simulation.