Quantum

PIQC: Scalable Distributed Quantum Computing via Photonic Integration of Designed Molecular Quantum Nodes

Anna Aubele, Gregor Bayer, Tim R. Eichhorn, Tobias Hahn, Fedor Jelezko, Philipp Neumann, Martin B. Plenio

Featured May 23, 2026

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Simply

Building big quantum computers is hard, so this paper uses tiny, custom-designed molecule qubits connected by light on special chips, making it easier to link them up and fix errors even if some light gets lost.

In depth

The paper introduces PIQC, a distributed quantum computing architecture that overcomes scaling limitations of monolithic systems by integrating rationally designed molecular qubits with mature thin-film lithium niobate (TFLN) photonic circuits. This framework leverages chemically tunable carbene molecules for robust qubit-photon interfaces and long-lived nuclear spin registers, combined with Stairway Floquetification of high-rate quantum low-density parity-check (qLDPC) codes to enable efficient, loss-tolerant entanglement and error correction across a networked hardware.

Key Takeaways

1
The PIQC architecture integrates designer molecular qubits with photonic circuits, offering atomic-precision tunability for qubit properties and seamless integration with existing fabrication technologies.
2
It employs heralded entanglement protocols that tolerate up to 70% photon loss, significantly improving the viability of long-range quantum connectivity in distributed systems.
3
The framework utilizes Stairway Floquetification to convert high-rate qLDPC codes into efficient Floquet codes, enabling syndrome extraction via simple weight-two Bell-pair measurements suitable for networked hardware.

Conceptual Flow

HIGH LEVEL

Methodology: Building Blocks for Quantum Computing

The system uses special molecules that act as tiny quantum bits, connected by light on a chip, to build a large quantum computer.

Custom Molecules

Light Chips

Connect & Control

Working Quantum Bits

Results: Scalable Quantum Computation

This new way allows many quantum bits to work together, even with some errors, making big quantum computers possible.

Many Quantum Bits

Error Correction

Compute Reliably

Large Scale Quantum Computer