SQUARE : Scalable QUbit AddREssing

SQUARE : Scalable QUbit AddREssing

Introduction
Image showing red laser

SQUARE aims to develop a new way of optically addressing trapped-ion qubits that can be efficiently and flexibly scaled to a large number of qubits.

In this project we will develop a waveguide-array addressing assembly that matches a bundle of fibres 1:1 onto an array of ion qubits. By developing a scalable interface between fibre components (such as fibre coupled modulators), and an array of ion qubits, we will be able to significantly increase the number of addressable qubits without any near-term scaling barriers.

Laser writing using femtosecond pulsed lasers and adaptive optics will enable the manufacture of three-dimensional low-loss waveguide circuits.  Designs will be scalable and flexible, providing adapters that are tailored to the ion-qubit configurations.  Refinements will minimise inter-qubit cross-talk to enable individual qubit addressing.

Objectives and impact

Successful completion of this project will result in efficient and high-fidelity control of far larger ion qubit arrays than is currently possible. This capability is critical for achieving the goals of HQCS. This will directly impact the HQCS goals for higher qubit capacity computational nodes and higher performance multi-qubit quantum logic gates.

PI
Professor Martin Booth

Professor Martin Booth
Department of Engineering
University of Oxford

Collaborator

Dr Chris Balance
Department of Physics
University of Oxford