The Art of Writing Claims in Quantum Computing Patents

Introduction: Quantum Computing Patents must be more than just abstract math and overboard functional language. They must clearly define a structured technical invention, show how it is operated with defined steps. It is an area where is it difficult to draw a line between theory and patentability of an invention, so it depends how one is drafting the claims. Claims need to be drafted meticulously.

What makes Quantum Claims Different

Quantum inventions generally are an amalgamation of physics, software and algorithms, that is why it is difficult to draft claims. A claim must not talk about abstract algorithms, but they must portray technical advancements and implementations to grab protection under the Patent law.

Technical problem comes first

This means that the claim must state the actual engineering marvel attached to the invention which makes it patent worthy - better qubit control, improved error mitigation, more efficient optimization, reduced noise sensitivity, or a more practical way to map data onto quantum resources. If the claim merely states a desired outcome, it risks looking like a result rather than an invention. Functional language is not forbidden, but it must be used carefully. Patent practice recognizes that a claim term may be functional, yet unlimited functional language can create problems under definiteness and written description if the claim does not clearly identify the scope or the structure behind the function. For quantum patents, that usually means anchoring functional language to concrete elements, steps, parameters, or hardware interactions. A claim that says “configured to improve computation” is weaker than one that explains what the system does, in what sequence, with what quantum resources, and to achieve what measurable technical result.

Layering of Claims

The claim set must begin with the actual technical pointers rather than buzzwords. The Patent Trial and Appeal Board, an adjudicatory body within the United States Patent and Trademark Office (USPTO), clearly states the importance of the problem being solved and the technical improvement in the invention being mentioned with clarity in the claim set.

The claims must be drafted in a layered manner, where the independent claim captures the main problem and the other dependent or tertiary claims narrow down to specific qubit types, encoding techniques, error correction steps, circuit arrangements, calibration parameters, or system architectures. This approach helps in two ways. First, it preserves commercial breadth. Second, it gives fallback positions if an examiner or court pushes back on eligibility, enablement, or scope. In a fast-moving field, that flexibility can be more valuable than trying to force everything into one sweeping claim.

Support the full scope

Quantum Claims are often vulnerable when the claim is more broad than the disclosure. The claim must not only focus on what the invention does, but also on how it performs and operates. That is especially important where the invention depends on experimental parameters, device conditions, or technical trade-offs that vary across platforms. Detailed examples, working embodiments, and implementation guidance help reduce the risk that the claim will be attacked later as unsupported or insufficiently enabled.

A Practical Drafting Example

A claim that simply says, “A method of performing optimisation using a quantum computer”, is probably too thin. It sounds more like a broad label for the field than a real description of what the invention actually does.

A stronger claim would be more grounded in the mechanics. It should explain what input is being transformed , which quantum resource is being used, how the steps unfold, and what technical benefit follows, such as fewer computational steps, or better performance on a specific class of problems. In Quantum patent drafting, being precise does not necessarily make the claim weaker, often, it is what gives the claim real strength.

PTAB’s Signal

In Yudong Cao, the PTAB focused on what the invention contributes in the real world, throwing light majorly on its practical real world role. These rulings are helping applicants and guiding them while drafting the claims, they are focusing on portraying how the quantum systems improve in practice. It also shows that practitioners must highlight the deficiencies in prior art and then compare it with the present system and the said improvement in the claims.

Author :- Vipasha Srivastava, in case of any query, contact us at Global Patent Filing or write back us via email at support@globalpatentfiling.com.

Endnotes

1. Ex parte Yudong Cao, Appeal No. 2024-002159, Decision on Appeal (Patent Trial and Appeal Board, 13 February 2025).
2. United States Patent and Trademark Office (USPTO), Manual of Patent Examining Procedure (MPEP) 2106, Patent Subject Matter Eligibility (9th ed., Rev. 01.2024).
3. USPTO, MPEP 2173, Claims Must Particularly Point Out and Distinctly Claim the Invention.
4. USPTO, 35 U.S.C. 112 Guidance, relating to claim definiteness, written description, and enablement requirements.
5. Enfish, LLC v. Microsoft Corp., 822 F.3d 1327 (Fed. Cir. 2016).
6. Alice Corp. Pty. Ltd. v. CLS Bank International, 573 U.S. 208 (2014).
7. National Law Review, Practical Tips on Developing Valuable Quantum Patents (2026).
8. Dennis Crouch, “Functional Claiming and Patent Eligibility After Alice,” Patently-O (various commentaries discussing software patents, functional claiming, and 112 requirements).