Quantum Gates with Phase Stability over Space and Time

TL;DR

This paper demonstrates a phase-insensitive entangling gate between two trapped ions, using a shared reference clock, which could be vital for scaling quantum processors across various platforms.

Contribution

The authors introduce a method for implementing quantum gates that are insensitive to optical phase fluctuations, enhancing scalability of quantum computing systems.

Findings

Achieved phase-insensitive entangling gates with trapped ions.

Demonstrated stability over space and time for quantum operations.

Potential for scalable quantum information processing.

Abstract

The performance of a quantum information processor depends on the precise control of phases introduced into the system during quantum gate operations. As the number of operations increases with the complexity of a computation, the phases of gates at different locations and different times must be controlled, which can be challenging for optically-driven operations. We circumvent this issue by demonstrating an entangling gate between two trapped atomic ions that is insensitive to the optical phases of the driving fields, while using a common master reference clock for all coherent qubit operations. Such techniques may be crucial for scaling to large quantum information processors in many physical platforms.