Photonic Quantum Computing Stocks
Photonic quantum computers encode information in particles of light, which means most of the machine can run at room temperature and lean on existing telecom and silicon-photonics manufacturing. It is also the approach of PsiQuantum, the best-funded private company in the sector. These are the public pure plays building photonic quantum hardware, ranked by market cap.
As of · updates with live market data
The companies, in order
1. Xanadu (XNDU) — $3.51B
Xanadu is a photonic quantum computing company developing room-temperature, light-based quantum computers and open-source quantum software. Its Aurora system (Jan 2025) is the world's first scalable modular photonic quantum computer. PennyLane is the leading open-source quantum ML library.
XNDU live data, financials & filings →2. Quantum Computing Inc (QUBT) — $2.11B
Quantum Computing Inc develops photonic quantum processors and reservoir quantum computing systems. Its Dirac series uses Entropy Quantum Computing (EQC) for constrained optimization, and its Neurawave product applies photonic reservoir computing to edge AI inference.
QUBT live data, financials & filings →Methodology: Includes US-listed pure-play quantum companies whose primary hardware modality is photonic. Pre-IPO photonic companies (PsiQuantum) appear in our private-company profiles, not in this ranking. Covers the US-listed pure-play quantum universe tracked by this site. Full metric definitions on the methodology page. Not investment advice.
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