PsiQuantum's Single-Photon Photonic Architecture

The real divide is not photonics versus non photonics, it is what each company treats as the basic unit of computation. PsiQuantum encodes information in discrete single photons, which makes its roadmap look like building a giant digital optical machine with sources, detectors, switches, and fiber links that can all be fabricated on 300mm wafers at GlobalFoundries. Xanadu’s continuous variable approach starts from squeezed light, where information lives in the amplitudes of optical modes, which changes the error correction stack, control methods, and hardware bottlenecks from the outset.

• In practical terms, PsiQuantum needs every step in a photon workflow to work on chip, create one photon, route it, interfere it with another photon, detect it, then connect many chips with standard telecom fiber. That is why its manufacturing story centers on integrated single photon sources, detectors, and chip to chip interconnects, not just photonic waveguides.
  1 sacra 2 psiquantum 3 nature
• Xanadu’s continuous variable systems use squeezed states, which are closer to analog signals than digital bits. That can make some optical operations natural on photonic hardware, but it also means fault tolerance depends heavily on how well the system prepares and stabilizes non classical light states and then layers qubit style error correction on top, such as GKP encoding.
  4 aps 5 xanadu
• The foundry comparison also says less than it used to. PsiQuantum still emphasizes GlobalFoundries as the manufacturing backbone for its Omega chipset, but by February 2026 Xanadu had expanded its hardware manufacturing partnership with Tower Semiconductor. The more important competitive question is now which architecture can turn foundry scale into fault tolerant system scale first.
  1 sacra 3 nature 6 globenewswire

Going forward, photonic quantum competition will be decided by which stack can absorb manufacturing scale into full system performance. If PsiQuantum keeps turning semiconductor process steps into reliable single photon components and modular fiber linked systems, its architecture is positioned to benefit most directly from the existing chip industry playbook. If Xanadu keeps improving continuous variable error correction, it can preserve a distinct path where photonics does more of the computing natively.