Phase gate and readout with an atom/molecule hybrid platform

TL;DR

This paper proposes a hybrid atomic/molecular platform for quantum computing, utilizing ultracold atoms and molecules to implement qubits, gates, and readout mechanisms through controlled state transfers and dipole interactions.

Contribution

It introduces a novel hybrid system combining atoms and molecules for quantum computation, including methods for phase gate implementation and molecular readout.

Findings

Two-atom systems can encode qubits and enable gates.

Ground rovibrational states of polar molecules facilitate two-qubit phase gates.

Coherent transfer processes enable molecular readout in quantum computing.

Abstract

We suggest a combined atomic/molecular system for quantum computation, which takes advantage of highly developed techniques to control atoms and recent experimental progress in manipulation of ultracold molecules. We show that two atoms of different species in a given site, {\it e.g.}, in an optical lattice, could be used for qubit encoding, initialization and readout, with one atom carrying the qubit, the other enabling a gate. In particular, we describe how a two-qubit phase gate can be realized by transferring a pair of atoms into the ground rovibrational state of a polar molecule with a large dipole moment, and allowing two molecules to interact via their dipole-dipole interaction. We also discuss how the reverse process of coherently transferring a molecule into a pair of atoms could be used as a readout tool for molecular quantum computers.