Optimal recoil-free state preparation in an optical atom tweezer

TL;DR

This paper presents optimized protocols for state preparation in atom tweezers that significantly reduce recoil effects, achieving high fidelity across various parameters, and advancing quantum computing capabilities.

Contribution

The authors develop pulse engineering protocols combining Rabi and force protocols to suppress recoil effects in atom tweezer qubits, improving fidelity beyond current standards.

Findings

Infidelity below current technological standards across regimes.

Protocols effective for a wide range of Rabi frequencies and pulse lengths.

Identification of three main regimes for optimal protocols.

Abstract

Quantum computing in atom tweezers requires high-fidelity implementations of quantum operations. Here, we demonstrate the optimal implementation of the transition $|0\rangle \rightarrow |1\rangle$ of two levels, serving as a qubit, of an atom in a tweezer potential, driven by a single-photon Rabi pulse. The Rabi pulse generates a photon recoil of the atom, due to the Lamb-Dicke coupling between the internal and motional degree of freedom, driving the system out of the logical subspace. This detrimental effect is strongly suppressed in the protocols that we propose. Using pulse engineering, we generate optimal protocols composed of a Rabi protocol and a force protocol, corresponding to dynamically displacing the tweezer. We generate these for a large parameter space, from small to large values of the Rabi frequency, and a range of pulse lengths. We identify three main regimes for the optimal protocols, and discuss their properties. In all of these regimes, we demonstrate infidelity well below the current technological standard, thus mitigating a universal challenge in atom tweezers and other quantum technology platforms.