Sparrow Quantum’s source sends half a billion photons per second

Sparrow Quantum has achieved the highest single-photon flux reported to date, delivering more than 500 million single photons per second into a single-mode fiber. This advance addresses a longstanding bottleneck in photonic quantum computing, where a reliable supply of identical photons is important for both processing and networking. The deterministic source, developed with Ruhr-Universität Bochum, operates at 1 GHz with over 50% fiber efficiency, combining speed with high photon purity and indistinguishability. The company says this addresses a longstanding photon bottleneck in quantum computing, signaling a potential shift for multi-photon experiments previously limited by practical photon availability.

Deterministic Source Achieves 500 Million Photon/Second Flux This performance isn’t simply about quantity; the source simultaneously maintains over 50% fiber efficiency, which helps minimize signal loss during transmission and enables practical quantum systems. High single-photon purity and two-photon indistinguishability further characterize the output, ensuring the photons generated are nearly identical, a necessity for complex quantum calculations and networking protocols. The ability to consistently generate such a high photon flux fundamentally alters experimental constraints, according to Sparrow Quantum. Previously, researchers often had to compromise experimental designs based on available photon resources, but this source shifts the bottleneck away from light generation and towards other system components. Reported figures for similar sources often include spectral filtering, a process that artificially inflates performance by discarding photons that would otherwise reduce overall counts; Sparrow Quantum’s reported flux reflects the raw output delivered to the fiber. Peter Lodahl, founder and Chief Quantum Officer at Sparrow Quantum, said, “We drove the source as hard as the emitter physically allows, collected every photon it produced, and the quality held.” The company reports a focus on practical implementation and reliability and consistency as they move forward. As an end-user, I always knew what the source was stopping me from doing. Juan C. Loredo, VP of Innovation at Sparrow Quantum and a co-author, who used earlier generations of the c High-Purity Source Enables Multi-Photon Quantum Experiments The demonstrated source delivers optical power exceeding 100 picowatts, a level sufficient for detection using standard optical power meters, a departure from typical single-photon counting methods and a boon for experimental efficiency. This capability stems from collecting the full, unfiltered emission, a strategy that maintains photon quality despite the high flux rate, as detailed in a recent preprint publication.

The team drove the source to its physical limits, meticulously measuring all emitted photons and reporting the conservative lower bound of its performance. Beyond sheer quantity, the source’s output is well-suited for complex quantum protocols; existing designs for linear optical quantum computing, quantum key distribution, and quantum networking have often remained theoretical due to practical limitations in photon availability. By employing time-space demultiplexing across ten channels, the source sustains tens of millions of photons per second to each, enabling coincidence rates high enough to make ten-photon experiments feasible and interference between approximately 10 to 20 photons routinely achievable. This advance represents a shift in the constraints researchers face. The work, carried out in collaboration with colleagues at Ruhr-Universität Bochum, allows for scaling entanglement capabilities while maintaining the current level of control and reliability. We drove the source as hard as the emitter physically allows, collected every photon it produced, and the quality held. Source: https://sparrowquantum.com/post/enough-light-at-last-sparrow-quantum-breaks-through-a-longstanding-photon-bottleneck-in-quantum-computing More like thisQuantum Computing Business NewsNovo Invests in Sparrow Quantum Photonic ChipsQuantum InternetQuantum Dots Now Emit Secure Photons at 1260 nm WavelengthQuantum Computing NewsQuantum Dots Generate 1260nm Photons for Secure NetworksQuantum Research NewsHunan Normal University: Researchers Achieve Highly Pure, Indistinguishable Single Photons for Quantum ComputingStay currentSee today’s quantum computing news on Quantum Zeitgeist for the latest breakthroughs in qubits, hardware, algorithms, and industry deals. Tags: Dr. Donovan Dr. Donovan is a futurist and technology writer covering the quantum revolution. Where classical computers manipulate bits that are either on or off, quantum machines exploit superposition and entanglement to process information in ways that classical physics cannot. Dr. Donovan tracks the full quantum landscape: fault-tolerant computing, photonic and superconducting architectures, post-quantum cryptography, and the geopolitical race between nations and corporations to achieve quantum advantage. The decisions being made now, in research labs and government offices around the world, will determine who controls the most powerful computers ever built. Latest Posts by Dr. Donovan: ORNL Southeastern Quantum Conference fosters new US quantum partnerships September 6, 2026 Quantum Zeitgeist Weekly Digest September 5, 2026 How Do Photonic Quantum Computers Work? September 5, 2026