Quantum Computing on Multi-atomic Ensembles in Quantum Electrodynamics Cavity

TL;DR

This paper presents a novel solid-state quantum computing architecture using multi-atomic ensembles in QED cavities, enabling universal quantum gates with simplified implementation and enhanced error immunity.

Contribution

It introduces a new multi-atomic ensemble-based quantum computing scheme with efficient gate operations and error resilience, satisfying DiVincenzo criteria.

Findings

Single-qubit operations implemented with three elementary gates

Controlled-NOT operation performed in a single step

Architecture satisfies key quantum computing criteria

Abstract

We propose an effective realization of a complete set of elementary quantum gates in the solid-state quantum computer based on the multi-atomic coherent (MAC-) ensembles in the QED cavity. Here, we use the two-ensemble qubit encoding and swapping-based operations that together provide implementation of any encoded single-qubit operation by three elementary gates and the encoded controlled-NOT operation is performed in a single step. This approach simplifies a physical realization of universal quantum computing and adds the immunity to a number of errors. We also demonstrate that the proposed architecture of quantum computer satisfies DiVincenzo criteria.