Towards a room-temperature spin quantum bus in diamond via optical spin injection, transport and detection

TL;DR

This paper proposes a method to realize a room-temperature spin quantum bus in diamond by leveraging novel mechanisms for optical spin injection, transport, and detection, addressing a key challenge in large-scale quantum information processing.

Contribution

It introduces new mechanisms for spin injection, transport, and detection in diamond, enabling the development of an on-chip spin quantum bus at room temperature.

Findings

Identified mechanisms for optical spin injection in diamond.

Demonstrated potential for coherent spin transport at room temperature.

Proposed integration of these mechanisms for quantum bus implementation.

Abstract

Diamond is a proven solid-state platform for spin-based quantum technology. The nitrogen-vacancy (NV) center in diamond has been used to realize small-scale quantum information processing (QIP) and quantum sensing under ambient conditions. A major barrier in the development of large-scale QIP in diamond is the connection of NV spin registers by a quantum bus at room temperature. Given that diamond is expected to be an ideal spin transport material, the coherent transport of spin directly between the spin registers offers a potential solution. Yet, there has been no demonstration of spin transport in diamond due to difficulties in achieving spin injection and detection via conventional methods. Here, we exploit detailed knowledge of the paramagnetic defects in diamond to identify novel mechanisms to achieve spin injection, transport and detection in diamond at room temperature. Having identified these mechanisms, we explore how they may be combined to realise an on-chip spin quantum bus.