Quantum Photonics 101: How Light Is Powering the Next Generation of Quantum Networks

Quantum Photonics 101: How Light Is Powering the Next Generation of Quantum Networks

Quantum photonics takes light, one of nature’s most familiar phenomena, and puts it to work in an entirely different way. Researchers can control individual particles of light called photons and nonclassical states of light to transmit and process information in ways that classical photonics cannot.^{1, 2}

Those capabilities could make highly secure communication possible across networks that connect quantum devices over significant distances. This post introduces the fundamental principles of quantum photonics and explains the role of photon detection, the development of quantum communication networks and the career opportunities emerging alongside these technologies.

The Fundamental Principles of Quantum Photonics

Classical photonics deals with the generation, transmission, and detection of light. Quantum photonics goes further, focusing on individual photons and nonclassical states of light whose behavior cannot be adequately explained by classical physics.^{1, 2}

Quantum states of light can carry and process information in ways that have no classical equivalent.³ A photon, for example, can exist in a superposition of horizontal and vertical polarization states until it is measured. Researchers can use those states to encode quantum information in a qubit.⁴

These properties make photons particularly valuable for distributed quantum systems. Photons can carry quantum information between devices, creating connections that could eventually allow quantum computers and other technologies to operate as parts of larger networks.³ Their usefulness also depends on something deceptively difficult: the ability to detect individual photons accurately and reliably.

How Single-Photon Detection Enables Quantum Computing

Quantum technologies depend not only on the ability to create and transmit photons, but also on the ability to measure them accurately. Single-photon detectors register individual photons and convert their arrival into measurable signals, making reliable detection a foundational capability for quantum networks.⁵

Researchers have made significant progress toward creating the extremely high detection efficiencies these systems require. Superconducting nanowire single-photon detectors have achieved system detection efficiencies as high as 98% at telecommunications wavelengths.⁶ These detectors operate at very low temperatures, which helps limit noise that can interfere with accurate measurements.

Even highly efficient detectors face challenges. Dark counts can produce signals when no photon has arrived, while afterpulsing can create additional false detections after a genuine event.⁵ Researchers are also improving the other side of the equation: the ability to generate single photons reliably when they are needed. In another important step toward practical quantum systems, recent advances in single-photon sources are helping overcome this challenge.⁷

Together, more reliable photon generation and detection bring researchers closer to quantum networks capable of transmitting information securely and consistently.

Building the Future with Quantum Communication and Networking

Quantum networking could extend the capabilities of quantum technologies beyond individual devices by allowing quantum systems to exchange information across greater distances.³

Security is one of the most compelling potential applications. A measurement changes a photon’s quantum state, so an attempt to intercept quantum information can reveal that the transmission has been disturbed.³ This principle is central to quantum cryptography and could help protect sensitive information as quantum communication technologies advance.

Distance presents a significant technical challenge. Researchers are working toward developing systems that can transmit quantum information over hundreds of kilometers through optical fiber, but photons cannot simply be copied or amplified along the way.⁴ Quantum repeaters offer a potential solution by distributing and swapping entanglement across longer distances.⁴

The U.S. Department of Energy identified the development of a nationwide quantum internet as a research priority and outlined a strategy for advancing the technologies needed to build it.⁸ Potential early applications include protecting information used in areas such as banking, health services and national security.⁸

The commercial market is developing alongside the research. One estimate projects that the global quantum communication market will reach $5.4 billion by 2030.⁹ Although significant scientific and engineering challenges remain, progress toward practical quantum networks is increasing the need for professionals with the expertise to help solve them.

Pursuing a Career in Quantum Technologies

As quantum technologies move from research laboratories toward commercial applications, employers need professionals who understand both the science and the engineering challenges involved. U.S. job postings requiring quantum skills tripled between 2011 and mid-2024, with engineering accounting for a significant share of the demand.¹⁰ Career paths extend across mechanical, optical and electrical engineering, as well as software development and technical laboratory work.¹¹

That range reflects the interdisciplinary nature of the field. Quantum technologies draw on expertise in photonics, materials, electronics, computing and systems engineering, making collaboration across technical disciplines essential to their development.

Broader occupational data also point to strong prospects in related fields. The U.S. Bureau of Labor Statistics (BLS) projects 22% employment growth for computer and information research scientists between 2025 and 2035.¹² As of the BLS’s most recently published wage data from 2025, the occupation had a median annual salary of $140,300, while physicists and astronomers had a median annual salary of $166,880.^{12, 13}

For engineers and technology professionals interested in quantum photonics, advanced education can provide the specialized technical knowledge needed to engage with an evolving field while strengthening the leadership skills required to guide complex projects and multidisciplinary teams.

Build the Expertise to Help Shape Quantum Technology

Quantum photonics could help make secure quantum communication and large-scale quantum networks possible. Turning that potential into practical technology will require professionals who understand the science and can also guide the teams, projects and decisions that move complex ideas toward real-world use.

UC Santa Barbara’s 100% online Master of Engineering and Technology Leadership (METL) program brings those capabilities together. The 38-unit curriculum combines advanced technical study with coursework in business, leadership and technology management. You can specialize in Quantum Information, Semiconductor Technology, AI and Technology Leadership, or Technology Management while developing skills in communication, decision-making, and strategic leadership.

Designed for working professionals, METL can be completed in 10 months of full-time study or paced part time over as many as four years. You’ll learn from leading engineering faculty and industry experts while gaining the technical depth and leadership perspective to take on greater responsibility in rapidly evolving technology fields.

Explore the METL curriculum and admission requirements, start your application, or contact us to discuss how the program can support your goals.

Sources

1. Retrieved on August 21, 2026, from nist.gov/programs-projects/single-photonics-and-quantum-information 
2. Retrieved on August 21, 2026, from nist.gov/pml/quantum-measurement/objectives/quantum-nature-light-and-matter 
3. Retrieved on August 21, 2026, from energy.gov/science/doe-explainsquantum-networks
4. Retrieved on August 21, 2026, from nist.gov/cybersecurity-and-privacy/what-quantum-cryptography
5. Retrieved on August 21, 2026, from nist.gov/pml/productsservices/quantum-networks-nist/technologies-quantum-networks/single-photon-detectors
6. Retrieved on August 21, 2026, from nist.gov/noac/technology/quantum-optics-and-radiometry/superconductive-nanowire-single-photon-detectors
7. Retrieved on August 21, 2026, from nist.gov/noac/technology/quantum-optics-and-radiometry/single-photon-sources
8. Retrieved on August 21, 2026, from energy.gov/articles/us-department-energy-unveils-blueprint-quantum-internet-launch-future-quantum-internet
9. Retrieved on August 21, 2026, from grandviewresearch.com/industry-analysis/quantum-communication-market-report
10. Retrieved on August 21, 2026, from spectrum.ieee.org/quantum-computing-jobs
11. Retrieved on August 21, 2026, from chicagoquantum.org/news/fast-growing-quantum-tech-industry-has-well-paid-jobs-and-most-dont-require-graduate-degree
12. Retrieved on August 21, 2026, from bls.gov/ooh/computer-and-information-technology/computer-and-information-research-scientists.htm
13. Retrieved on August 21, 2026, from bls.gov/ooh/life-physical-and-social-science/physicists-and-astronomers.htm