A quantum computation architecture using optical tweezers

TL;DR

This paper proposes a scalable quantum computing architecture using ultracold atoms manipulated by optical tweezers, optimizing atom transport and gate operations to achieve high fidelity within practical error thresholds.

Contribution

It introduces a complete architecture for quantum computation with ultracold atoms in optical lattices using optical tweezers, including optimized non-adiabatic transport and gate protocols.

Findings

Gate times of a few hundred microseconds achieved

Error probabilities kept below 10^-3

Requirements for positioning and noise are feasible for fault tolerance

Abstract

We present a complete architecture for scalable quantum computation with ultracold atoms in optical lattices using optical tweezers focused to the size of a lattice spacing. We discuss three different two-qubit gates based on local collisional interactions. The gates between arbitrary qubits require the transport of atoms to neighboring sites. We numerically optimize the non-adiabatic transport of the atoms through the lattice and the intensity ramps of the optical tweezer in order to maximize the gate fidelities. We find overall gate times of a few 100 us, while keeping the error probability due to vibrational excitations and spontaneous scattering below 10^3. The requirements on the positioning error and intensity noise of the optical tweezer and the magnetic field stability are analyzed and we show that atoms in optical lattices could meet the requirements for fault-tolerant scalable quantum computing.