Hybrid qubit-oscillator module with motional states of two trapped interacting atoms

TL;DR

This paper introduces a robust qubit-oscillator system using motional states of two trapped atoms manipulated by optical tweezers, enabling high-fidelity quantum gates and scalable architectures without involving internal atomic states.

Contribution

It presents a novel motional qubit-oscillator implementation with precise control, high-fidelity gate operations, and scalability potential using optical tweezer technology.

Findings

High-fidelity bosonic gate operations demonstrated numerically

System robustness due to absence of internal state involvement

Scalability achievable through atom coupling via dipolar or Rydberg interactions

Abstract

We propose the use of motional states of two interacting atoms trapped in a potential stroboscopically engineered by an optical tweezer as a means to implement a qubit-oscillator system, in analogy to those implemented in circuit quantum electrodynamics and trapped ions. In our setting, the center of mass degree of freedom of the atoms plays the role of a photon or phonon mode, while the interacting, relative mode acts as a qubit. No internal state is involved in our system, which makes this motional qubit robust to spin-dependent noise. We show that a universal set of bosonic operations, including displacement, rotation, squeezing, and the corresponding set of gates controlled by the qubit, can be implemented through precise temporal modulation of the optical tweezers. We numerically check that these gates can be generated with high fidelity, and discuss possible schemes for initial state preparation and final state readout. While we restrict the discussion to a single qubit-oscillator module, scalability can be achieved by coupling arrays of atoms via dipolar or Rydberg-dressed interactions.