Scientists develop a fluorescent-protein spin qubit, enabling precise quantum sensing and biological measurement with future commercial potential.
Fluorescent-Protein Spin Qubit Breakthrough Opens New Path for Quantum Sensing
A recent scientific report introduces a new type of optically addressable protein spin qubit built from a fluorescent protein. This fluorescent-protein qubit represents a major step in quantum technology research by showing that small, biologically compatible molecules can act as quantum bits. Unlike traditional solid-state systems, this innovation uses an enhanced yellow fluorescent protein tested at low temperatures and in living cells.
Feder, J. S., Soloway, B. S., Verma, S., Geng, Z. Z., Wang, S., Kifle, B. B., Riendeau, E. G., Tsaturyan, Y., Weiss, L. R., Xie, M., Huang, J., Esser-Kahn, A., Gagliardi, L., Awschalom, D. D., & Maurer, P. C. conducted this research and published it under the title “A fluorescent-protein spin qubit”, in August 2025.
ENTECH STEM Magazine has included this research in its list of Top 10 Physics Discoveries and Innovation of 2025.
How Fluorescent-Protein Spin Qubit Works
A protein spin qubit is a system that uses quantum spin states to encode information. Traditional qubits are often made from solid-state structures like diamond defects or quantum dots. However, this study shows that fluorescent proteins commonly used for biological imaging can also support qubit operations.
In this innovation, researchers used an enhanced yellow fluorescent protein (EYFP) as a basis for the qubit. They employed a near-infrared laser pulse to read the protein spin qubit state in its metastable triplet configuration. When controlled with coherent microwave fields at liquid-nitrogen temperatures, the qubit showed substantial coherence and measurable spin contrast.
Validating Coherent Control
The team achieved control over the protein’s spin states using microwave pulses and observed electron spin coherence times that reached tens of microseconds under sophisticated decoupling sequences. This level of coherence, while measured at cryogenic temperatures, shows that the fluorescent-protein spin qubit can maintain quantum information long enough for useful sensing tasks.
Interestingly, the protein spin qubit maintained its performance even when expressed inside living mammalian cells, suggesting a path toward real-world biological quantum sensors.
Why Fluorescent-Protein Spin Qubits Matter
Advantages Over Other Qubit Platforms
Traditionally, quantum bits have been built using complicated solid structures that are not genetically encodable. In contrast, a fluorescent-protein spin qubit offers several unique advantages:
- Its genetic compatibility allows targeted tagging inside biological systems.
- It has a physical size of only a few nanometers.
- It responds to optical excitation, enabling precise initialization and readout.
These features may allow quantum sensing directly inside cells, a major milestone for quantum biotechnology.
Real-Life Applications
This new qubit platform offers a range of practical applications. For example, it could enable highly sensitive measurement of magnetic fields, electrical fields, or temperature gradients at the nanoscale. Such capabilities are valuable in areas like
- Biological imaging at resolutions that surpass conventional methods.
- Medical diagnostics necessitate precise sensing within living systems.
- Fundamental physics research involves the use of quantum sensors to measure subtle changes in the environment.
When Could This Innovation Be Used More Broadly?
Near-Term Expectations
Currently, the fluorescent-protein qubit remains mainly a research-stage technology. Scientists have demonstrated its potential in controlled laboratory settings, including at low temperatures and in cell cultures. However, it has yet to be incorporated into commercial devices.
Future Outlook
Researchers anticipate that over the course of the next 10 years, they will investigate methods to enhance coherence, expand usefulness at higher temperatures, and incorporate fluorescent-protein qubits into sensing systems. Early goods could be developed as a result of such efforts by research laboratories and biotechnology corporations. Over more extended periods, these qubits might eventually become a component of sophisticated imaging or diagnostic systems that have an influence in the actual world.
Research Areas and Careers Connected to This Work
Quantum Engineering and Physics
Students interested in the physics behind spin qubits can, therefore, pursue careers in quantum engineering. Specifically, this field focuses on designing devices that use quantum states for information processing and sensing. Moreover, work in this area often involves quantum optics, coherent control techniques, and quantum measurement.
Biophysics and Molecular Engineering
Quantum science and biology intersect at the forefront of this innovation. Scientists that specialize in biophysics and molecular engineering are able to investigate the behavior of biological molecules, such as fluorescent proteins, as quantum systems. Knowledge and expertise in molecular tagging and genetic encoding are very valuable in this context.
Medical Imaging and Diagnostics
Opportunities may present themselves for medical technologists in the process of modifying fluorescent-protein qubits for imaging or diagnostic purposes. Career opportunities in research hospitals or biotechnology companies may be available to individuals who possess expertise in optical microscopy, biomedical instrumentation, and sensor integration.
Finally, computational physicists can contribute by modeling qubit behaviors and optimizing control protocols. As quantum sensor research grows, demand for simulation specialists will rise.
Why This Innovation Advances Science
For the first time, researchers have shown that genetically encoded proteins can serve as quantum bits. This finding expands the range of materials suitable for quantum technologies. In addition, it bridges the gap between quantum physics and life sciences. As research continues, fluorescent-protein spin qubits may provide tools that enrich both fundamental science and practical applications.
Additionally, to stay updated with the latest developments in STEM research, visit ENTECH Online. Basically, this is our digital magazine for science, technology, engineering, and mathematics. Further, at ENTECH Online, you’ll find a wealth of information.
Reference:
- Feder, J. S., Soloway, B. S., Verma, S., Geng, Z. Z., Wang, S., Kifle, B. B., Riendeau, E. G., Tsaturyan, Y., Weiss, L. R., Xie, M., Huang, J., Esser-Kahn, A., Gagliardi, L., Awschalom, D. D., & Maurer, P. C. (2025). A fluorescent-protein spin qubit. Nature, 645(8079), 73–79. https://doi.org/10.1038/s41586-025-09417-w
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