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Google patents method to build specific quantum states on a computer

This filing describes a way to set up a quantum computer with a specific mix of basic states, known as a superposition. It uses a smaller set of control bits to guide the main quantum bits into the right pattern, which helps in measuring properties of complex calculations.

Why it mattersThis is a foundational technique for running advanced algorithms on quantum hardware, though it is a step toward future capabilities rather than a consumer product.

In the filing’s own words

Methods, systems and apparatus for preparing arbitrary superposition quantum states of a quantum register on a quantum computer, the quantum state comprising a superposition of L computational basis states. In one aspect, a register of log L qubits is prepared in a weighted sum of register basis states, where each register basis state indexes a corresponding quantum state computational basis state, and the amplitude of each register basis state in the weighted sum of register basis states is equal to the amplitude of the corresponding computational basis state in the superposition of L computational basis states. A unitary transformation that maps the register basis states to the corresponding L computational basis states is then implemented, including, for each index 1 to L, controlling, by the register of log L qubits, transformation of the quantum system register state for the index to the corresponding computational basis state for the index.

What exactly they claim (claim 1)

1. A method to estimate a phase of an eigenvector of a unitary operator, comprising: preparing an initial quantum state that approximates the eigenvector, comprising, for each index from 1 to L: controlling, by a register of log L qubits, transformation of the initial quantum state for the index to a corresponding computational basis state for the index, wherein the register of log L qubits comprises a weighted sum of register basis states, each register basis state indexing a corresponding computational basis state, and wherein an amplitude of each register basis state in the weighted sum of register basis states is equal to an amplitude of the corresponding computational basis state in the initial quantum state; and evolving the initial quantum state according to the unitary operator to obtain an evolved quantum state; and measuring a phase of the evolved quantum state.

Facts

Company
Google (Google LLC)
Official title
PREPARING SUPERPOSITIONS OF COMPUTATIONAL BASIS STATES ON A QUANTUM COMPUTER
Publication number
US20260268196A1
Application number
19090872
Filed
Mar 26, 2025
Published
Sep 10, 2026
Inventors
2
Claims
17

Classified under

G06N 10/60 Physics & computingG06F 9/30101 Physics & computingG06N 10/20 Physics & computing
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.