Quantum-Grade Security

This article is part of the Quantum Snake Oil Dictionary — a series examining terms used in quantum technology marketing. The series is divided into Red Flag Terms (terms with no established technical meaning that almost always signal hype or fraud) and Misused Terms (legitimate concepts routinely stripped of context in marketing). This entry is a Red Flag Term.

A note before we begin. This article examines the terms “quantum-grade security,” “quantum-level security,” “quantum-grade randomness,” and related phrases as they appear across multiple product categories. I am not referring to any specific company, product, or individual. Multiple vendors use these terms, and most are probably not acting in bad faith. But the terms themselves are empty, and buyers who accept them at face value are making procurement decisions based on a certification that does not exist.

The Claim

“Quantum-grade security.” “Quantum-level randomness.” “Quantum-grade encryption keys.” These phrases appear across QRNG vendor brochures, QKD product sheets, post-quantum VPN marketing, market research reports, and (memorably) a 2026 trade publication describing “military-grade printers” with “Zero-Trust quantum modules.”

The implication is consistent: there exists a defined quality tier called “quantum” that sits above other tiers. Products at this level have achieved a standard of security, randomness, or encryption that non-quantum products cannot match. The word “grade” or “level” suggests a formal classification, something issued by a recognized authority after evaluation against published criteria.

What Actually Exists

No recognized standards body has defined a “quantum grade” of security.

NIST SP 800-90B, the foundational standard for entropy source validation, does not distinguish between quantum and non-quantum entropy sources. It defines two evaluation tracks (IID and non-IID) based on the statistical properties of the output. A QRNG and a classical TRNG are evaluated under the same requirements. A QRNG that passes the IID track has achieved “full entropy” per SP 800-90B. So has a classical TRNG that passes the same track. Neither receives a “quantum grade.”

FIPS 140-3, the cryptographic module validation standard, defines four security levels (1 through 4) based on physical security, key management, and self-test requirements. None of these levels reference quantum technology. A FIPS 140-3 Level 3 module with a classical entropy source is, from a regulatory perspective, equivalent to a FIPS 140-3 Level 3 module with a quantum entropy source. The standard evaluates what the module does, not what physics the vendor claims it uses.

BSI AIS 31 defines two classes of physical random number generators: P1 (non-cryptographic) and P2 (cryptographic, requiring a stochastic model of the noise source). Again, no “quantum grade.”

Common Criteria evaluates products against security targets at Evaluation Assurance Levels (EAL1 through EAL7). No quantum tier.

The ITU-T Recommendation X.1702 provides a framework architecture for quantum noise random number generators and distinguishes QRNGs from classical TRNGs taxonomically. But it does not create a quality hierarchy where quantum sources are rated above classical ones. It describes what a QRNG is. It does not claim that being a QRNG makes a device superior.

Why the Term Persists

“Quantum-grade” persists because it fills a gap in buyer vocabulary. Security products need quality labels. Buyers are accustomed to tiered certifications: FIPS 140-3 has four levels, Common Criteria has seven EALs, SOC reports come in Type I and Type II. The phrase “quantum-grade” pattern-matches to this framework. It sounds like the buyer is getting a product that has been evaluated and placed at the top of a recognized hierarchy.

Vendors use the term because it converts complexity into a purchasing signal without requiring the buyer to understand the underlying physics or the actual certification structure. “Our product provides quantum-grade security” is easier to put on a slide than “Our product contains an entropy source validated under NIST SP 800-90B on the IID track, with conditioned output fed to a DRBG compliant with SP 800-90A, integrated into a cryptographic module validated under FIPS 140-3 at Security Level 2.”

The second sentence is what you should be hearing. The first is a substitute for it.

Where It Appears

The term is not confined to one product category:

In QRNG marketing, “quantum-grade randomness” implies the entropy output is categorically better than classical alternatives. As I detail in my QRNG Buyer’s Guide, a certified classical TRNG (like Intel’s RDRAND, which has been FIPS-validated and feeds billions of cryptographic operations daily) can provide stronger assurance than an uncertified QRNG with impressive marketing. The word “quantum” does not override the absence of independent evaluation.

In QKD marketing, “quantum-level security” implies that quantum key distribution achieves a security level unattainable by classical means. QKD does provide information-theoretic security for key exchange under specific conditions, but the phrase “quantum-level” suggests a formal certification that does not exist. QKD security depends on implementation details, side-channel resistance, and classical post-processing. These are engineering questions, not grade assignments.

In post-quantum product marketing, “quantum-grade encryption” conflates two different meanings of “quantum.” A post-quantum VPN uses classical algorithms (like ML-KEM) designed to resist quantum attack. There is nothing “quantum-grade” about the encryption itself. The algorithms are classical. They were selected because they resist a specific computational threat. The label borrows the quantum brand without earning it.

In market research reports, the term appears as an uncritical descriptor. One 2025 report describes QRNGs as “essential for creating unbreakable encryption keys” with “quantum-level security guarantees.” Market analysts are not standards bodies. Their vocabulary should not be adopted as procurement criteria.

Questions to Ask

When a vendor describes their product as “quantum-grade” or “quantum-level”:

Which specific standard defines this grade? (The answer should name a real standard: NIST SP 800-90B, FIPS 140-3, BSI AIS 31, Common Criteria. If the answer is vague, the term is marketing.)

What independent certification has this product received, and at what level? (Ask for certificate numbers. “We pass NIST SP 800-22 tests” is not the same as “We hold NIST ESV certification on the IID track.”)

How does the “quantum” component of your product change the security properties compared to a classical equivalent with the same certifications? (This is the question that separates genuine quantum advantage from branding. A QRNG with NIST ESV certification provides a provable entropy model that a classical TRNG without such certification does not. But a classical TRNG with AIS 31 P2 certification also provides a provable entropy model. The differentiator is the certification, not the adjective.)

Can you describe what “quantum-grade” means in terms of measurable security properties that I could independently verify? (If the answer involves min-entropy rates, certification levels, and validation reports, you are talking to a serious vendor. If it involves the word “quantum” repeated in different combinations, you are reading a brochure.)

The Bottom Line

Security has grades. They are defined by NIST, BSI, Common Criteria, and other recognized bodies, and they are earned through independent evaluation. “Quantum” is not one of those grades. When a vendor says “quantum-grade security,” they are using the prestige of quantum physics as a substitute for the rigor of an actual certification. Ask for the certificate number. If they can provide one, the product may be excellent, and the marketing is merely redundant. If they cannot, the marketing is doing the job that the certification should be doing, and that is a purchasing signal you should take seriously.