Photonics in Quantum: Where Light Meets Compute Report
Xanadu Quantum Technologies (NASDAQ: XNDU, TSX: XNDU) listed on Nasdaq and the TSX on March 27, 2026, the first pure-play photonic quantum computing company on a major exchange. Deal materials put its market capitalization near $3.6 billion at listing. Six months later, the stock trades near $7.40, down roughly 26% from its early September level, with a market cap around $2.2 billion.
That drawdown doesn’t settle the underlying question. A useful qubit can plausibly be made of light. Whether a useful machine can be built on the same 300-millimeter wafer lines that already serve silicon photonics, at a cost structure that clears, has not been shown.
This I3 Capital Group sector note, authored by Blair Carey, CFA, maps the two competing architectures chasing that answer: PsiQuantum’s discrete variable approach, backed by a $1 billion Series E from BlackRock, Temasek, and Baillie Gifford, against Xanadu’s continuous variable bet and its disclosed 60% cut in optical loss. It traces the shared supply chain both depend on, the foundry rails, the packaging lines, the fiber plant, and identifies where Quantum Machines and Classiq sit in the control and software layer regardless of which qubit wins.
The report assigns no rating and no price target. It lays out what would need to be true, on yield, loss, and detection, before the manufacturing claim becomes a completed result.
