QC82 Unveils First Commercially Practical Architecture for Generation of Error-Correctable Photonic Qubits

QC82 has published a new architecture that provides a practical path to generating the photonic qubits required for fault-tolerant quantum computing and many high-value quantum photonic applications.

These specialized quantum states, known as GKP states, are essential for scalable quantum information processing, quantum-secure communication, and precision sensing — yet have historically been extremely difficult to produce in a hardware-feasible way.

Building on our earlier long-term architecture road-map, our new results shows that GKP state generation can be achieved using accessible squeezing and photon-number measurements, without relying on the complex switching networks or probabilistic photon number states used in earlier proposals. This makes high-quality non-Gaussian photonic qubits significantly more achievable on real photonic hardware.

Why This Matters

GKP states are central to continuous-variable quantum architectures, but generating them with high fidelity and high success probability has been one of the major bottlenecks for photonic quantum systems.

Many existing designs require:

• Large switching networks that introduce significant loss

• Probabilistic single- and multi-photon sources

• Detectors with high photon number resolution limiting computing clock speeds 

• Photonic chip components that are difficult to produce with commercial-grade fidelities

These constraints have limited progress toward manufacturable, scalable photonic quantum hardware.

QC82’s architecture takes a more practical route, enabling high-quality GKP state generation using components available in leading photonic labs today.

The QC82 Architecture (Technical Detail)

Our method integrates:

• Teleportation-based squeezing on a multi-mode time-multiplexed cluster state

• Iterative, low photon-number measurements achievable with SNSPDs or non-cryogenic segmented detector designs

• Measurement-driven off-chip control without active on-chip switching of the quantum state

• Simple breeding protocols from mixtures of probabilistic cat and momentum squeezed states to negate the need for output multiplexing and switching

Squeezing acts as the tunable control mechanism, removing the need for high-loss switching networks while enabling controlled photon subtraction and noise suppression across the process.

Our simulations show a fault-tolerance threshold of 11.5 dB cluster squeezing, comparable to much more complex architectures, but achieved here using only experimentally accessible hardware.
With state-of-the-art experiments already reaching ~15 dB single-mode squeezing, this requirement sits within reach of current capabilities.

This work introduces a realistic, manufacturable pathway toward non-Gaussian photonic hardware — a core requirement for large-scale, fault-tolerant photonic quantum systems.

Publication

📄 Research Paper
Squeezing-Enhanced Photon-Number Measurements for GKP State Generation
Download the paper

📰 Press Release
QC82 Publishes Practical Architecture for Fault-Tolerant Photonic Qubit Generation
Read the PR

QC82 — PHOTONIC QUANTUM INFRASTRUCTURE