Quantum sensing, a rapidly maturing subset of quantum technology, is increasingly recognized for its transformative potential to provide unprecedented precision in measuring gravitational fields. Such advancements have direct applications in subsurface imaging, robust navigation solutions, and enhanced environmental monitoring. Despite the critical importance of detailed spatial data across sectors such as infrastructure, energy, and defense, current technologies have struggled to provide consistently high-resolution and accurate geospatial intelligence. Delta.g addresses these deficiencies by utilizing quantum phenomena—specifically exploiting the delicate quantum states of matter—to attain measurement sensitivities that markedly surpass traditional gravity sensors.

Originating from deep-rooted research undertaken at the University of Birmingham within the UK Quantum Technology Hub for Sensors and Timing, Delta.g’s proprietary technology integrates complex quantum algorithms and innovative sensor engineering. These components collectively imbue their platforms with superior portability, resilience, and precision, enabling reliable operation in diverse and challenging real-world environments. Early pilot trials have already demonstrated the technology’s effectiveness across transport infrastructure and dual-use scenarios, affirming its practical viability and the potential for widespread adoption.

CEO Tony Lowe articulated the company’s vision, emphasizing the strategic importance of viewing unseen subterranean features with unparalleled clarity. Lowe stated, “Our goal is to operationalize quantum sensing, creating agile and precise field-deployable systems that illuminate critical subsurface anomalies—from concealed sinkholes to aging infrastructure vulnerabilities.” This vision aligns with the growing global demand for sophisticated spatial intelligence that underpins informed decision-making in risk management, urban planning, and defense operations.

Traditional geophysical survey tools suffer from significant limitations, often delivering incomplete or ambiguous spatial data that compromise operational safety and elevate costs. In the UK alone, inaccurate subsurface information is implicated in multi-billion-pound annual losses and persistent resilience challenges. Delta.g’s quantum gravity sensors offer a leap forward in data fidelity, empowering stakeholders to anticipate hazards and optimize planning with a data-driven accuracy heretofore unavailable.

Rob Jesudason, CEO and Founder of Serendipity Capital, highlighted Delta.g as a flagship example of UK excellence in quantum and dual-use technologies, linking the company’s progress to broader governmental investment and scientific infrastructure. Jesudason remarked on the exceptional caliber of the scientific founders—Professors Mike Holynski, Jonathan Winch, and Andrew Lamb—whose pioneering work has laid the foundation for world-class innovation. This endorsement reflects not only the technical promise but also Delta.g’s capacity to emerge as a global leader in applying quantum mechanics to critical sensing challenges.

From an investment perspective, John Williams, General Partner at SCVC, recognized Delta.g as embodying an ideal trajectory where disruptive science is fostered early, supported by robust company building and visionary leadership. This seed round milestone represents the culmination of extensive research and development efforts and signals a new phase where science transitions into tangible impact across multiple industries.

NSSIF’s strategic involvement additionally underscores the dual-use appeal of Delta.g’s technology, given its capacity to augment both commercial and defense-related applications. Their spokesperson noted the excitement in supporting the next developmental phase, which promises to refine the sensor technology and expand operational capabilities. Through collaborative partnerships, the company aims to accelerate field deployments that comprehensively demonstrate the quantum advantage in real-world scenarios.

Looking ahead, the infusion of capital will enable Delta.g to broaden its engineering and manufacturing talent pools, significantly enhancing production scalability. A critical focus lies in refining the quantum sensor architecture to reduce size, improve robustness, and maximize deployment flexibility, thereby facilitating widespread adoption. More than hardware development, Delta.g is also advancing its data analytics platform to transform raw sensor output into actionable spatial insights, forging a “Google Maps” for the subterranean world that integrates quantum-grade geospatial intelligence into everyday decision-making processes at scale.

This holistic approach—combining hardware innovation with sophisticated data interpretation—positions Delta.g at the forefront of a nascent market where quantum sensing transitions from laboratory curiosity to operational mainstay. The anticipated downstream benefits extend beyond traditional gravity measurements, offering novel capabilities in GPS-denied environments for navigation and precise monitoring of environmental changes, thereby expanding the horizons of quantum technology’s practical utility.

In sum, Delta.g’s successful financing round represents a critical juncture for quantum sensing technologies, bolstering the UK’s stature in the competitive global quantum landscape. By transforming foundational science into deployable systems with immediate real-world relevance, Delta.g exemplifies the catalytic potential of quantum innovation to redefine how industries perceive and interact with spatial data, enabling smarter, safer, and more efficient infrastructure and operations worldwide.

Subject of Research: Quantum gravity sensing technologies and their application in subsurface spatial intelligence.

Article Title: Delta.g Secures £4.6 Million to Revolutionize Subsurface Imaging with Quantum Gravity Sensors

News Publication Date: Not specified in the original text.

Web References:
– Delta.g company website: http://www.delta-g.co.uk/

Image Credits: Credit: Delta.g

Keywords

Quantum gravity, Applied physics, Quantum sensing, Quantum technology, Subsurface imaging, Geospatial intelligence, Quantum sensors, Infrastructure monitoring, Dual-use technology, Quantum measurement precision, Quantum data analytics, Quantum navigation

Conventional computing is founded on bits that hold a value of either 0 or 1, encoding information in a binary form. Quantum computers, on the other hand, leverage the phenomena of superposition and entanglement, allowing qubits to simultaneously represent states 0 and 1 in a complex, probabilistic mixture of states. This capacity enables quantum machines—such as a 20-qubit system—to represent over a million states at once, exponentially expanding their computational potential compared to classical computers. Unlocking this potential requires precise measurement of qubit states, a process inherently delicate due to the sensitivity of quantum information to external disturbances.

The act of measuring qubits demands the use of highly sensitive amplifiers capable of detecting extremely faint microwave signals emitted during quantum readout. These amplifiers must function with minimal noise to prevent disruption of the qubit’s fragile quantum state. However, existing amplification technologies generate heat and electromagnetic interference that contribute to qubit decoherence—the process by which the quantum system loses its coherence and thus its stored information. For decades, the search for more efficient, lower-noise quantum amplifiers has been a critical bottleneck in scaling quantum computing technology.

The team at Chalmers University, spearheaded by doctoral researcher Yin Zeng and supervised by professor Jan Grahn, has pushed the boundaries of amplifier technology by developing a transistor-based amplifier that consumes only a tenth of the power required by the best amplifiers currently available, without compromising on sensitivity or noise performance. This dramatic reduction in power usage directly addresses the decoherence problem, offering a pathway to larger, more stable quantum processors.

What fundamentally distinguishes this amplifier is its pulsed operation. Unlike conventional amplifiers that are continuously powered, this new technology activates only when qubit information needs to be read. This time-gated operation dramatically cuts unnecessary power consumption and minimizes thermal emissions during idle periods, thereby preserving the coherence of surrounding qubits.

Achieving rapid activation was no trivial feat. Quantum information is transmitted in pulses on nanosecond timescales, necessitating an amplifier that not only conserves energy but also responds with exceptional speed. Using an innovative approach involving genetic programming algorithms, the researchers engineered the amplifier’s control system to activate and reach full operational capacity within just 35 nanoseconds. This swift response aligns perfectly with the brief duration of qubit signal pulses, ensuring no loss in readout fidelity.

In addition to this smart pulse control, Chalmers researchers implemented a novel noise and amplification measurement technique tailored for pulse-operated low-noise microwave amplifiers. This breakthrough methodology enabled accurate characterization of the amplifier’s performance during the rapid switching intervals, a critical factor for verifying its suitability in quantum readout applications.

The implications of this development extend far beyond incremental improvements in amplifier technology. As quantum computers scale to thousands or even millions of qubits, heat dissipation from amplifiers operated continuously would pose an insurmountable barrier, causing widespread decoherence and limiting computational scale. The pulse-activated amplifier circumvents this hurdle by drastically reducing power consumption and thermal load, effectively unlocking new avenues for scaling quantum systems.

This advancement fits within the broader framework of Chalmers University’s commitment to quantum technology research, notably through the Wallenberg Centre for Quantum Technology, which fosters national efforts toward constructing scalable, practical quantum machines. The collaboration with Low Noise Factory AB, a leading manufacturer of ultra-low-noise microwave amplifiers, provided the industrial expertise necessary to transition experimental concepts into functional components suitable for real-world quantum computing platforms.

Funding from the Chalmers Centre for Wireless Infrastructure Technology and the Vinnova program "Smarter Electronic Systems" has been instrumental in supporting this research, underscoring the strategic importance of bridging fundamental science with technological innovation in the rapidly evolving quantum field.

Looking ahead, the practical adoption of this pulse-operated amplifier could redefine quantum computer architectures. By integrating energy-efficient, fast-responsive amplifiers, next-generation quantum systems can operate with more qubits, longer coherence times, and improved error rates, thereby bringing closer the realization of quantum advantages in various sectors including optimization problems, complex simulations, and secure communications.

The Chalmers team’s findings were published in the April 2025 issue of the IEEE Transactions on Microwave Theory and Techniques under the title “Pulsed HEMT LNA Operation for Qubit Readout.” This study lays the foundation for a new class of quantum measurement hardware essential for the next evolution in quantum computing.

Subject of Research:
Not applicable

Article Title:
Pulsed HEMT LNA Operation for Qubit Readout

News Publication Date:
April 17, 2025

Web References:
https://doi.org/10.1109/TMTT.2025.3556982
https://www.chalmers.se/en/centres/wacqt/
https://www.chalmers.se/en/centres/witech/

References:
Zeng, Y., Grahn, J., Stenarson, J., & Sobis, P. (2025). Pulsed HEMT LNA Operation for Qubit Readout. IEEE Transactions on Microwave Theory and Techniques. DOI: 10.1109/TMTT.2025.3556982

Image Credits:
Chalmers University of Technology | Yin Zeng | Maurizio Toselli

Keywords:
Quantum computing, qubit readout, low-noise amplifier, pulsed amplifier, semiconductor transistors, quantum decoherence, superposition, microwave technology, quantum measurement, scalability, energy-efficient amplifiers, genetic programming