For centuries, humanity has utilized light for survival, navigation, and energy. While traditional education often describes light as a wave that refracts through a prism into a rainbow, modern physics reveals a more complex reality. In the early 1900s, physicists like Albert Einstein discovered that light is composed of discrete packets of energy called photons. Whether light behaves as a wave or a particle depends on how it is observed. This duality is fundamental to understanding our world; everything we see is the result of photons interacting with our eyes. Understanding light as a stream of particles is the first step toward harnessing it for advanced technologies beyond simple illumination or solar power.
Australia has a rich history in physics research and maintains several leading organizations dedicated to the study of optics and nuclear science.
To utilize light for quantum technology, we must operate at the nanoscale—a scale where an atom is to a blueberry what a blueberry is to the entire Earth. At this size, the rules of physics change. To encode information onto a single photon, scientists must reliably create and detect them one by one. In labs like those at UNSW, researchers use silicon (the material in computer chips) doped with a rare element called erbium. By striking this erbium atom with a laser, they produce precisely controlled photons. However, this process requires extreme environments; the equipment must be cooled to near absolute zero (-273 degrees Celsius), which is significantly colder than deep space, to ensure the photons remain stable and detectable by sensitive nanowire sensors.
Leading Australian universities and research centres are at the forefront of engineering quantum systems and nanotechnology.
The ability to control single photons unlocks revolutionary applications. One major field is information security. Photons can act like 'locked diaries' or 'golden snitches' carrying secret data. If someone attempts to intercept or 'unlock' this information with the wrong key, the laws of quantum mechanics cause the information to disappear entirely, making the data tamper-proof. Furthermore, photons can serve as 'qubits'—the building blocks of quantum computers. Unlike classical bits, photonic qubits can store complex data and travel easily between different nodes of a computer. By mastering the creation and detection of these light particles, we are laying the foundation for computers that can solve problems currently impossible for standard machines.
The Australian government and national science agencies have developed specific roadmaps for the adoption and development of quantum technologies.