Mitsubishi Electric Corporation and Nanofiber Quantum Technologies Inc. (NanoQT) jointly announced today the immediate start of a joint demonstration to develop interconnection technologies for neutral-atom quantum computers.

Neutral-atom quantum computers have several advantages in terms of scalability because of their high integration and ability to use optical tweezers to flexibly control the arrangement of atoms. Nevertheless, the physical number of quantum bits (qubits) that can be controlled in one place in a detectably single system is limited due to a variety of physical constraints, including the space within which atoms can be arranged. New technologies will need to be developed in order to enable the interconnection of quantum computers and effectively "grow" the number of qubits, necessary for practical large-scale quantum computing.

In this joint demonstration, a photonic quantum interface will be developed utilizing Mitsubishi Electric's advanced qubit control technologies and applying NanoQT's technology of combining Yb atoms and nanofiber cavities to implement technology to potentially demonstrate high-efficiency interconnection between neutral Yb atom quantum computers. This demonstration aims to build a photon-atom interface, ultimately leading to interconnections of neutral-atom quantum computers that have very high efficiency.

Nanofiber cavities will utilize enhanced atom-photon interactions, thereby substantially improving the efficiency of producing quantum entanglement for inter-quantum computer communication. Moreover, if multiple Yb atoms can be stored in nanofiber cavities, the project can share entanglement in parallel. Together with Mitsubishi Electric's qubit control technologies, these developments will facilitate high-speed, large-capacity communication between quantum computers.