Sparrow Quantum reports more than 500 million fibre-delivered single photons per second

Verdict: MONITOR

The quantum-dot source combines a one-gigahertz drive rate with about 51.5% fibre efficiency; Photon quality falls at the highest rate, and no complete photonic computer is demonstrated.

Reviewed, edited and approved by Joerg Germann, Editor · Editorial method

Quantum Litmus provides independent editorial analysis, not investment advice.

Holdings disclosure: Holdings confirmed 5 October 2026: the editor personally holds shares in IONQ, IQMX, NVDA, PSQL, QBTS, QUBT, RGTI, and XNDU.TO. Backloop Technology holds none. These holdings did not determine selection or the readiness judgment. About this report.

This is editorial analysis, not investment, procurement or engineering advice.