Form 8-K

8-K — Rigetti Computing, Inc.

Accession: 0001104659-26-040377

Filed: 2026-04-07

Period: 2026-04-07

CIK: 0001838359

SIC: 7371 (SERVICES-COMPUTER PROGRAMMING SERVICES)

Item: Regulation FD Disclosure

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — tm2611278d1_8k.htm (Primary)

EX-99.1 — EXHIBIT 99.1 (tm2611278d1_ex99-1.htm)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT Pursuant

to Section 13

or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported):

April 7, 2026

RIGETTI

COMPUTING, INC.

(Exact name of Registrant as Specified in Its Charter)

Delaware

001-40140

88-0950636

(State or Other Jurisdiction

of Incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification No.)

775

Heinz Avenue, Berkeley,

California

94710

(Address of Principal Executive Offices)

(Zip Code)

(510)

210-5550

(Registrant’s Telephone Number, including area code)

N/A

(Former Name or Former Address, if Changed Since Last Report.)

Check the appropriate box below if the Form 8-K filing is intended

to simultaneously satisfy the filing obligations of the registrant under any of the following provisions:

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

Pre-commencement communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of

each class

Trading

Symbol(s)

Name of each

exchange

on which registered

Common

Stock, $0.0001 par value per share

RGTI

The Nasdaq

Capital Market

Warrants,

each whole warrant exercisable for one share of Common Stock at an exercise price of $11.50 per share

RGTIW

The Nasdaq

Capital Market

Indicate by check mark whether the registrant is an emerging growth

company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities

Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant

has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant

to Section 13(a) of the Exchange Act. ¨

Item 7.01 Regulation FD Disclosure.

On April 7, 2026, Rigetti

Computing, Inc. (the “Company”) issued a press release announcing the general availability of its 108-qubit system, Cepheus-1-108Q.

A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this “Current Report”) and is

hereby incorporated by reference.

The information included

in Item 7.01 of this Current Report (including Exhibit 99.1 hereto) is being furnished and shall not be deemed “filed” for

purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to liabilities

of that section, and shall not be deemed incorporated by reference into any filing under the Exchange Act or the Securities Act of 1933,

as amended, except as expressly set forth by specific reference in such filing.

Item 8.01 Other Events.

On April 7, 2026, the Company

announced the Cepheus-1-108Q system deployed through the Rigetti Quantum Cloud Services (QCS®) Platform and Amazon Braket is currently

performing at a 99.1% median two-qubit gate fidelity with a gate speed of ~60 ns and a 99.9% median single-gate fidelity.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits.

Exhibit

No.

Description

99.1

Press Release issued by

the Company on April 7, 2026.

104

Cover Page Interactive

Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities

Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: April 7, 2026

RIGETTI COMPUTING, INC.

By:

/s/ Jeffrey Bertelsen

Jeffrey Bertelsen

Chief Financial Officer

EX-99.1 — EXHIBIT 99.1

EX-99.1

Filename: tm2611278d1_ex99-1.htm · Sequence: 2

Exhibit 99.1

Rigetti Announces General Availability of 108-Qubit

System

Cepheus-1-108Q validates Rigetti’s proprietary chiplet-based

scaling architecture and is now generally available to Rigetti’s customers and partners via the Rigetti Quantum Cloud Services

platform and through Amazon Braket, the quantum computing service by AWS.

Berkeley, CA -- Rigetti Computing, Inc. (Nasdaq: RGTI) (“Rigetti”

or the “Company”), a pioneer in full-stack quantum-classical computing, today announced the general availability of its 108-qubit

quantum computing system, Cepheus™-1-108Q, now accessible to customers and partners via the Rigetti Quantum Cloud Services (QCS®)

Platform and through Amazon Braket, the quantum computing service by AWS.

Cepheus-1-108Q is Rigetti’s highest qubit-count system to date

and the industry’s largest modular quantum computing system, based on Rigetti’s proprietary chiplet-based architecture. The

system comprises twelve interconnected 9-qubit chiplets, tripling the number of qubits and chiplets from Rigetti’s previous 36-qubit

system, Cepheus-1-36Q.

The system is currently performing at a 99.1% median two-qubit gate

fidelity with a gate speed of ~60 ns and a 99.9% median single-gate fidelity. Rigetti is releasing Cepheus-1-108Q now in response to

growing customer interest, and will continue to improve the system performance throughout 2026 as the Company advances on its roadmap.

“Cepheus-1-108Q is a milestone that validates our ambitious

approach to scaling quantum computers," said Dr. Subodh Kulkarni, Rigetti CEO. “Our proprietary chiplet-based architecture

is paving the way toward higher fidelity, higher qubit systems that will ultimately enable fault-tolerant quantum computing.

“We are proud of the progress we have made in delivering a system

at this scale. The innovations we’ve developed while designing this system give us confidence in our vision and approach to building

the next generation of quantum computers. We will continue to improve fidelity as we scale to higher qubit counts and deploy new systems

as we reach important performance milestones while maintaining gate speeds that are roughly 1,000-10,000 times faster than other modalities

such as trapped-ion and neutral-atom systems.”

“The addition of Cepheus-1-108Q to Amazon Braket gives our global

customers another choice as they research quantum computing applications in materials science, optimization, and quantum simulation.

As the first gate-based device on Braket with over 100 qubits, Cepheus-1-108Q delivers improved fidelities that allow customers to push

to wider and deeper circuits,” said Eric Kessler, General Manager, Amazon Braket. "Rigetti was a launch partner for Amazon

Braket, and we're excited to deepen that relationship with this launch. With Cepheus-1-108Q, we bring the third generation of Rigetti

devices to our customers, following Aspen and Ankaa. We remain committed to providing researchers and enterprises around the world with

access to the latest quantum hardware."

Key Technical Advancements

The new system features several significant engineering improvements

designed to maintain fidelity and performance as qubit counts grow:

● Enhanced qubit and coupler design: Optimized chip design

enables fast two-qubit gates and higher fidelity.

● CZ gates for error correction: Supports high-fidelity

native gates and efficient circuit compilation necessary for quantum error correction and

future fault-tolerant architectures. Rigetti achieved a two-qubit gate fidelity as high as

99.9% at 28 nanoseconds on a prototype system using a proprietary implementation of an adiabatic

CZ gate scheme. These gates are already in use on Cepheus-1-108Q and will continue to improve

as Rigetti incorporates those prototype learnings into larger systems.

● Upgraded control electronics: A newly engineered control

system delivers superior signal-to-noise ratio for qubit readout.

● Advanced fabrication process: Rigetti’s Alternating-Bias

Assisted Annealing technique improves qubit frequency targeting and reduces defects, contributing

to higher fidelities.

During system development, Rigetti refined its architecture to mitigate

coupling interactions between tunable couplers that become more pronounced beyond 100 qubits. These design improvements shifted the primary

performance limitation from coupler behavior to coherence time, a key factor the Company continues to address through innovations in

materials and fabrication.

Roadmap

Rigetti plans to continue to improve the fidelity of its individual

chiplets and expects Cepheus-1-108Q to reach a median 99.5% two-qubit gate fidelity later this year. Rigetti intends to update its technology

roadmap later this year, once it has incorporated the results of this work, including how the Company plans to reach quantum advantage

in about three years.

For more information on Amazon Braket, please visit https://aws.amazon.com/braket/.

About Rigetti

Rigetti is a pioneer in full-stack quantum computing.

Rigetti quantum computers are based on superconducting qubits, which are widely believed to be the leading qubit modality given their

maturity, clear path to scaling, and fast gate speeds. Current Rigetti quantum computing systems achieve gate speeds of 50-70ns, which

is about 1,000 times faster than other modalities such as ion traps and neutral atoms.

The Company operates quantum computers over the cloud through its

Rigetti Quantum Cloud Services (QCS) platform, enabling global enterprise, government, and research clients to pursue R&D. The Company’s

proprietary quantum-classical infrastructure provides high-performance integration with public and private clouds for practical quantum

computing.

Rigetti sells on-premises 9-108 qubit quantum computing systems, supporting

national laboratories and quantum computing centers. Rigetti’s 9-qubit Novera QPU supports a broader R&D community with a high-performance,

on-premises QPU designed to plug into a customer’s existing cryogenic and control systems.

Rigetti developed the industry’s first multi-chip quantum processor

for scalable quantum computing systems. Leveraging this proprietary technology, Rigetti deployed the industry’s largest multi-chip

quantum computer in 2025 with Cepheus-1-36Q, based on four 9-qubit chiplets tiled together. The Company designs and manufactures its

chips in-house at Fab-1, the industry’s first dedicated and integrated quantum device manufacturing facility. Learn more at https://www.rigetti.com/.

Rigetti Computing Media Contact:

press@rigetti.com

Amazon Braket Media Contact:

Mayar Abdelrahim

abmayar@amazon.com

Cautionary Language and Forward-Looking Statements

Certain statements in this communication may be considered “forward-looking

statements” within the meaning of the federal securities laws, including statements with respect to the Company’s expectations

with respect to its future success and performance, including the Company continuing to improve the system performance throughout 2026

as the Company advances on its roadmap; the chiplet-based architecture paving the way toward higher fidelity, higher qubit systems that

will ultimately enable fault-tolerant quantum computing; the confidence in the Company’s vision and approach to building the next

generation of quantum computers; the improvement to fidelity as the Company scales to higher qubit counts and deploy new systems as we

reach important performance milestones while maintaining gate speeds; expectations for Cepheus 1 108Q to reach a median 99.5% two qubit

gate fidelity later this year; and intentions to update the technology roadmap later this year. These forward-looking statements are

based upon estimates and assumptions that, while considered reasonable by the Company and its management, are inherently uncertain. Factors

that may cause actual results to differ materially from current expectations include, but are not limited to: the Company’s ability

to achieve milestones, technological advancements, including with respect to its technology roadmap; Company’s ability to deliver

products to customers in time or at all, including actions by customers, such as controls over their facilities and cancelling orders;

the ability of the Company to obtain government and national contracts successfully and in a timely manner and the availability of such

funding; the potential of quantum computing; the success of the Company’s partnerships and collaborations; the Company’s

ability to accelerate its development of multiple generations of quantum processors; the outcome of any legal proceedings that may be

instituted against the Company or others; the ability to maintain relationships with customers and suppliers and attract and retain management

and key employees; costs related to operating as a public company; changes in applicable laws or regulations, including those related

to exports; the possibility that the Company may be adversely affected by other economic, business, or competitive factors; the Company’s

estimates of expenses and profitability; the evolution of the markets in which the Company competes; the ability of the Company to implement

its strategic initiatives and expansion plans; the expected use of proceeds from the Company’s past and future financings or other

capital; the sufficiency of the Company’s cash resources; unfavorable conditions in the Company’s industry, the global economy

or global supply chain, including rising inflation and interest rates, deteriorating international trade relations, political turmoil,

natural catastrophes, warfare, and terrorist attacks; and other risks and uncertainties set forth in the section entitled “Risk

Factors” and “Cautionary Note Regarding Forward-Looking Statements” in the Company’s Annual Report on Form 10-K

for the year ended December 31, 2025 and other documents filed by the Company from time to time with the Securities and Exchange Commission.

These filings identify and address other important risks and uncertainties that could cause actual events and results to differ materially

from those contained in the forward-looking statements. Forward-looking statements speak only as of the date they are made. Readers are

cautioned not to put undue reliance on forward-looking statements, and the Company assumes no obligation and does not intend to update

or revise these forward-looking statements other than as required by applicable law. The Company does not give any assurance that it

will achieve its expectations.

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