A product-centered intellectual property moat
QLT's patent portfolio is organized from the chip core outward ● protecting the proprietary coherence-restoration waveguide geometry, switching layer, materials integration, and quantum applications that define the flagship processor.
Proprietary optical distortion reversal for quantum computing is unpatented globally
Exhaustive prior art searches confirm no existing patents combine QLT's proprietary coherence-restoration method with quantum error correction for photonic qubits. QLT occupies this white space with 34+ filings and 448+ claims organized across four tiers.
Four-tier IP structure
Patents organized from the core product outward ● each tier builds on and defends the ones beneath it.
Tier 1 · Core Product
5 Patents · ~120 ClaimsRoom-Temperature Quantum Processor Architecture
→A heterogeneous photonic processor that performs quantum computation at 300K — no cryogenics, no dilution refrigerators. Standard server rack deployment.
View patent detailsSelf-Phase-Matched Coherence-Restoration Waveguide
→The nonlinear engine that reverses quantum decoherence passively via four-wave mixing — no active electronics, no cryogenics, proven Si₃N₄ platform.
View patent detailsUltrafast All-Optical Switch for Quantum Feed-Forward
→Technology-agnostic ultrafast optical switching (committed TFLN electro-optic baseline, sub-ns; fs piezo upgrade verification-pending) — enabling real-time measurement-based quantum logic without electronic bottlenecks.
View patent detailsStress-Relief Cladding for Hybrid Waveguides
→Five-layer cladding architecture preventing micro-cracking in hybrid nonlinear waveguides. Survives –40°C to +85°C thermal cycling qualification.
View patent detailsIsotopically Engineered Topological Photonic Circuit
→Topological protection against fabrication defects up to 41nm — with integrated quantum memory and 1.77 dB/m propagation loss at room temperature.
View patent detailsTier 2 · Product Extensions
3 Patents · ~60 ClaimsContinuous-Variable Quantum Processor
→Monolithic chip for squeezed-light quantum computing. Triple-mode: CV quantum, discrete-variable quantum, and classical analog on one die.
View patent detailsPhotonic Neural Network Accelerator
→Self-correcting optical matrix multiplication. Solves the 84% accuracy drift problem that blocks photonic AI hardware. Sub-10ns inference latency.
View patent detailsHybrid Quantum-Classical Cryptanalysis Engine
·Filing in preparation. Details available under NDA.
Tier 3 · Defensive Coverage
6 Patents · 148 ClaimsPeriodic Phase Conjugation Lattice Method
→Transforms unbounded linear phase error growth into bounded constant — enabling quantum circuits of arbitrary depth without catastrophic decoherence.
View patent detailsPhase-Corrected Multiplexed Single-Photon Source
→Ensures every multiplexed photon arrives identically regardless of which source or route delivered it. HOM visibility restored to >99%.
View patent detailsHybrid Nonlinear Waveguide with Acoustic Suppression
→Multi-layer SBS suppression raising the effective threshold by 3–5×. Noise floor below 0.01 photons per mode under CW pumping.
View patent detailsOPC-Assisted Qubit Encoding Conversion
→The "USB-C of quantum networking" — seamless bidirectional conversion between all major qubit encoding formats with bounded cascaded error.
View patent detailsSelf-Calibration & Diagnostics via Dual-Use OPC
→Error correction modules become built-in diagnostic sensors — zero additional hardware overhead. Predictive maintenance and ML-optimized calibration.
View patent detailsPassive Quantum Entanglement Distribution Over Fiber
→Mid-span OPC for fiber quantum networking — no active compensation, no cryogenic repeaters, deploy on existing telecom fiber infrastructure.
View patent detailsTier 4 · Supporting & Future
21+ Filings21+ additional filings including quantum memories, qRAM, interconnects, timing synchronization, and 14 defensive provisionals
·Covering data-center integration, acoustic-photonic interactions, satellite quantum links, and quantum simulation IP. Details available under NDA.
Why the portfolio is organized this way
Every patent exists to defend a specific aspect of the flagship processor. There are no orphan filings, no patents without a product anchor, and no speculative claims that could undermine credibility.
- Core patents defend what sits on the chip
- Extension patents protect commercial applications
- Defensive filings close routes around the core moat
- Defensive provisionals preserve future optionality
- Partner IP boundaries formally defined
All-optical transistor technology
QLT's proprietary femtosecond all-optical switch is foundational to the control layer. Protected by exclusive licensing agreements and proprietary integration protocols for quantum applications.
- Sub-ns TFLN EO switching (committed) ● fs piezo upgrade verification-pending
- Exclusive quantum application rights
- Protected integration protocols
- Next-generation switch designs in development
Request detailed patent documentation
Public materials describe the portfolio structure. Family-level claim charts, prosecution strategy, and implementation-sensitive detail are available through a controlled diligence path.