Photonic Encryption & QKD Patent Snapshot 2026
The photonic encryption and QKD patent corpus is small and highly concentrated: a single applicant, Marvell Asia, holds roughly 41% of indexed patent families, with the top five filers accounting for nearly two-thirds of the leading hundred applicants’ combined total. Annual filing volume has eased from its earlier peak, signalling a field in late-stage decline rather than active expansion.
Marvell Asia leads a tightly concentrated, small-corpus field
Marvell Asia Pte Ltd is the clear leader, holding 7 patent families — more than three times the count of any other ranked applicant. Clemson University Research Foundation follows at 2 patent families, with the remaining applicants each holding a single family.
The top five filers collectively account for 63% of the ranked applicants visible in this query’ combined total, indicating a sharply tiered visible assignee structure. The gap between the leader and the challenger tier is wide, leaving little ambiguity about who controls the visible share of indexed intellectual property.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Marvell Asia Pte Ltd | 7 | |
| 2 | Clemson University Research Foundation | 2 | |
| 3 | Nanyang Technological University | 1 | |
| 4 | Southwest University | 1 | |
| 5 | Suzhou Gezhi Quantum Technology Co., Ltd. | 1 | |
| 6 | Chandigarh University | 1 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 7 | Dr. Samanvita N | 1 | |
| 8 | Rizhao Superfluid Information Technology Co., Ltd. | 1 | |
| 9 | UNM Rainforest Innovations | 1 | |
| 10 | Dr. Amruth Ramesh Thelkar | 1 | |
| 11 | Ciena Corporation | 1 | |
| 12 | Zhejiang Quantum Technology Co., Ltd. | 1 |
Marvell Asia’s position, combined with its status as a new entrant by momentum metrics, suggests recent deliberate portfolio construction rather than long-standing incumbency. Academic and research-institute filers — Clemson, Nanyang Tech, Southwest University, and Chandigarh University — collectively represent a secondary tier that could seed future commercial spin-outs.
The most recent one to two years of data should be read cautiously given standard publication lag; apparent low counts in 2024–2025 likely understate true activity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Volume has eased from an early peak; digital transmission dominates the technology mix
Two structural features define this field: a filing curve that has declined from its 2018 peak, and a technology composition anchored by digital information transmission (H04L) with meaningful secondary presence in optical systems and digital data processing.
Annual filing trend
Filings peaked in 2018 at 3 patent families, with a secondary cluster in 2020–2021, before easing. The 2023–2025 bars reflect ongoing publication lag and should not be taken as definitive low-activity years; the overall trajectory nonetheless supports a post-peak characterisation.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H04L (digital information transmission) is the visible IPC class, reflecting the protocol and cryptographic-key-exchange core of QKD. G02B (optical elements and systems) and G06F (electric digital data processing) form a strong secondary cluster, showing that silicon photonics integration and system-level computing are closely coupled to the core transmission work. Sparse classes such as G02F, G06N, and G06Q represent potential adjacent white space.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
System and apparatuses for measurement-device-inde…
Embodiments of the invention provide a chip-based system and apparatuses for measurement-device-independent (MDI) quantum key distribution (QKD). The system comprises two transmitters and a receiver, wherein each of the two transmitters is communicably connectable to the receiver and comprises a first modulator, a second modulator, and a third modulator… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | System and method for secure transactions to trans… | 15 |
| 2 | Physical unclonable function from an integrated ph… | 14 |
| 3 | Silicon photonics based module for storing cryptoc… | 14 |
| 4 | 一种基于硅基可调偏振旋转器的QKD系统 | 13 |
| 5 | Silicon photonics based module for storing cryptoc… | 9 |
| 6 | System and apparatuses for measurement-device-inde… | 8 |
| 7 | Silicon photonics based module for storing cryptoc… | 5 |
| 8 | 一种基于硅光子混沌同步的双向长距离保密通信系统 | 5 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
Marvell Asia Pte Ltd
Marvell Asia holds 7 patent families, making it the decisive leader in this corpus. Its technology emphasis spans optical elements and systems (G02B 6), electric digital data processing (G06F 13 and G06F 15), reflecting a silicon photonics integration approach to secure communications. Momentum trend is flagged as a new entrant, indicating this portfolio was built recently rather than accumulated over many years.
families: 7Clemson University Research Foundation
Clemson University Research Foundation holds 2 patent families, placing it second in the ranking. Its technical focus covers measurement and dimensions (G01B 9), digital data processing security (G06F 21), and digital information transmission cryptography (H04L 9) — a profile that bridges physical-layer measurement with cryptographic protocols, consistent with an academic research mandate. No momentum trend data is available for Clemson in the current evidence.
families: 2Frequently asked questions
The evidence covers 17 patent families in scope. This is a notably small corpus, which makes the visible position of any single applicant — and the sparsity of adjacent IPC branches — more analytically significant than it would be in a larger field.
Marvell Asia Pte Ltd leads with 7 patent families, more than three times the count of the next-ranked applicant (Clemson University Research Foundation at 2 patent families). Marvell Asia is flagged as a new entrant by momentum metrics, indicating recent portfolio construction.
The lifecycle stage is classified as Decline, with annual filing volume easing back from the 2018 peak. The recent-window growth figure is -29%. The most recent one to two years of data are subject to publication lag, so apparent low counts in 2024–2025 should not be read as definitive.
The United States is the visible jurisdiction with 11 patent records, followed by China with 3 and India with 2. A single WIPO PCT filing indicates limited multilateral prosecution. US protection is clearly the priority for existing filers in this corpus.
H04L (digital information transmission) is the visible class with 14 patent records, followed by G02B (optical elements and systems) and G06F (electric digital data processing). The sparsest adjacent classes are G02F (optical control and modulation, 1 record), G06Q (business and admin data processing, 1 record), and H03H (impedance networks and filters, 1 record), which represent the thinnest coverage relative to the core.
No co-applicant activity is detected in the current evidence. The absence of consortium or joint-filing structures may reflect the small corpus size or the early stage of commercial QKD development; it means there are no established collaboration networks observable in this dataset.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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