Fault-tolerant integrated photonic quantum computing

Wei Wang, Menglong Fang, Hao Yu +7 more

Integrated photonic quantum chips have emerged as a promising platform for realizing fault-tolerant photonic quantum computers. Compared with bulk-optics systems, integrated photonics offer compact device footprints, enhanced programmability, and exceptional stability, attributes that are essential for executing large-scale and computationally demanding quantum tasks. In this review, we provide a comprehensive overview of recent advances in both discrete-variable and continuous-variable universal photonic quantum computation. We survey progress in fault-tolerant architectures and state-of-the-art integrated platforms and highlight the key challenges that must be addressed to scale photonic systems toward full fault tolerance. Finally, we outline future opportunities and research directions aimed at bridging the gap between current proof-of-principle demonstrations and fully scalable quantum microprocessors.

Frederik K. Marqversen

Mercedes Gimeno-Segovia, Hugo V. Cable

Mercedes Gimeno-Segovia

General purpose quantum computers will utilize millions of physical qubits, thus requiring an underlying qubit technology that can be manufactured at scale. Integrated silicon photonics is an intrinsically scalable and manufacturable platform where all necessary gates are available to manipulate qubits, encoded in photons, with very high fidelity and low noise. In this talk, we will discuss architectures for fault-tolerant quantum computing with photonics in the newly-introduced fusion-based quantum computing paradigm. Fusion-based quantum computing presents a new framework for fault-tolerant quantum computation, focused on the efficient integration of quantum error correction and physical-level hardware operations. Its primitives, small entangled resource states and projective entangling gates, make it particularly useful in an integrated photonics platform, offering significant architectural simplifications and reducing requirements on physical level operations.

Yanbing Young Zhang

Mihai D. Vidrighin

PsiQuantum’s goal is to build the first useful quantum computer. Our approach is based on a scalable fault tolerant architecture that can be implemented using integrated photonics circuits connected by low loss optical fiber. We are developing the technology required for the photonics circuits in a commercial silicon foundry. We will discuss the fusion-based quantum computing architecture and highlight some of the technologies that have been developed by the company.