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Updated: Jun 18, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Fusion-based implementation of qLDPC codes with quantum emitters.

Susan X Chen^1,2, Matthias C Löbl^3,4, Ming Lai Chan^3,4

¹Quantum Engineering Centre for Doctoral Training, H. H. Wills Physics Laboratory and School of Electrical, Electronic, and Mechanical Engineering, University of Bristol, Bristol, UK.

NPJ Quantum Information

|June 17, 2026

Summary

This summary is machine-generated.

Quantum low-density parity check (qLDPC) codes offer higher encoding rates for fault-tolerant quantum computing. A new architecture using quantum emitters and photonic states achieves high photon loss tolerance, showing performance comparable to topological codes with better efficiency.

Keywords:

Mathematics and computing Optics and photonics Physics

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Area of Science:

Quantum Information Science
Quantum Computing Architectures
Error Correction Codes

Background:

Topological codes like surface codes are standard for quantum error correction but have high overhead.
Quantum low-density parity check (qLDPC) codes offer higher encoding rates, crucial for practical fault-tolerant quantum computing.
Photonic implementations are suitable for qLDPC codes due to their ability to support non-local connections.

Purpose of the Study:

To propose a novel architecture for implementing Calderbank-Shor-Steane (CSS) qLDPC codes using quantum emitters.
To enhance photon loss tolerance in photonic quantum computing architectures.
To analyze the performance of qLDPC codes under realistic noise conditions.

Main Methods:

Development of a quantum emitter-based architecture for CSS qLDPC code implementation.
Deterministic production of photonic resource states using quantum emitters.
Incorporation of a conditional repeat-until-success strategy for photon loss tolerance.
Simulation of Bivariate Bicycle qLDPC codes and performance analysis under noise.

Main Results:

The proposed architecture successfully implements CSS qLDPC codes.
High photon loss tolerance was achieved through the implemented strategy.
Simulations demonstrated performance comparable to topological architectures.
The qLDPC code implementations achieved significantly higher encoding rates.

Conclusions:

The proposed quantum emitter-based architecture provides a viable and efficient method for implementing qLDPC codes.
This approach offers a promising pathway towards practical, fault-tolerant quantum computing with reduced overhead.
The architecture demonstrates robustness against photon loss and fusion failure, crucial for photonic quantum systems.