Quantum mechanics once baffled scientists. Now it's changing the world
Science News from research organizations Quantum mechanics once baffled scientists. Now it's changing the world Date: July 5, 2026 Source: Texas A&M University Summary: Quantum mechanics has journeyed from a strange and controversial idea to the foundation of some of humanity’s most advanced...
Science News from research organizations Quantum mechanics once baffled scientists. Now it's changing the world Date: July 5, 2026 Source: Texas A&M University Summary: Quantum mechanics has journeyed from a strange and controversial idea to the foundation of some of humanity’s most advanced technologies. Now researchers are pushing its boundaries even further, with potential breakthroughs in energy, medicine, computing, and our understanding of the universe. Share: Facebook Twitter Pinterest LinkedIN Email FULL STORY A century after baffling Einstein and Schrödinger, quantum mechanics is powering world-changing technologies—and its biggest surprises may still be coming. Credit: AI/ScienceDaily.com For much of the early 20th century, quantum mechanics was one of the most puzzling ideas in science. The theory challenged conventional thinking and left even leading physicists struggling to make sense of its implications. A century later, it has become the foundation of technologies that influence daily life, including lasers, microchips, secure communications, and emerging quantum computers. In a new perspective article published in Science, Dr. Marlan Scully of Texas A&M University reflects on the remarkable evolution of quantum mechanics, from an abstract theory about tiny particles to a powerful framework helping researchers tackle some of the most difficult questions in science. "Quantum mechanics started as a way to explain the behavior of tiny particles," said Scully, who is also affiliated with Princeton University. "Now it's driving innovations that were unimaginable just a generation ago." Scully has played a major role in advancing the field. He co-authored the influential textbook Quantum Optics, a resource that has educated generations of physicists. His research in coherent nanoscale laser spectroscopy helped make it possible to study molecules with atomic-scale precision. He has also developed groundbreaking concepts involving quantum heat engines, which challenge traditional assumptions about thermodynamic efficiency and may one day lead to new energy technologies. From Schrödinger's Cat to Quantum Technology One of the most famous illustrations of quantum mechanics came in 1935, when Erwin Schrödinger proposed his cat paradox. The thought experiment suggested that a cat could exist in a state that is both alive and dead until it is observed. Schrödinger introduced the idea to highlight how strange quantum theory appeared. Today, those once-bizarre concepts have moved far beyond philosophical debates. "That 'quantum weirdness' is no longer just a philosophical puzzle," said Scully. "It's the foundation of quantum computing, quantum cryptography and even gravitational wave detection." The foundations of quantum mechanics were built by pioneers including Schrödinger and Werner Heisenberg. They developed two different mathematical approaches, wave mechanics and matrix mechanics, to describe quantum systems. Over time, these approaches were unified and contributed to the development of quantum field theory, which explains how particles interact through electromagnetic and nuclear forces. Their work expanded on Niels Bohr's early atomic model, which pictured electrons orbiting the nucleus much like planets orbit the sun. While later discoveries refined that picture, Bohr's model helped pave the way for modern quantum theory. Quantum Coherence and the Rise of Lasers Among the most important concepts in quantum mechanics is quantum coherence. This phenomenon allows particles such as atoms and photons to remain linked in a coordinated state, even across significant distances. Quantum coherence led directly to the development of the laser, a technology that many once believed could never work. Today, lasers are used throughout modern society, from supermarket barcode scanners to vision correction procedures and advanced scientific instruments. Coherence is also closely tied to quantum entanglement, the phenomenon that prompted Albert Einstein to describe it as "spooky action at a distance." Entanglement enables particles to share information through uniquely quantum properties. These effects form the basis of quantum encryption systems and improve the sensitivity of sophisticated instruments such as the Laser Interferometer Gravitational-Wave Observatory (LIGO), which detects tiny ripples in spacetime. Quantum Heat Engines Challenge Classical Limits One of the more surprising applications of quantum physics involves quantum heat engines. Traditional engines are constrained by the Carnot Limit, which defines the maximum efficiency allowed by classical thermodynamics. Researchers have found that by exploiting quantum coherence, it may be possible to create engines that exceed those classical limits. "It's a striking example of how quantum principles can rewrite the rules of classical physics," Scully said. Quantum Biology, Gravity, and Turbulence The influence of quantum mechanics now extends far beyond physics. In biology, techniques such as coherent Raman spectroscopy allow researchers to examine viruses and other structures at the nanoscale, providing valuable insights into the microscopic world. Quantum ideas are also shaping efforts to understand the universe itself. Scientists working on concepts such as string theory and quantum gravity are attempting to reconcile quantum mechanics with Einstein's theory of relativity, one of the biggest unsolved problems in modern physics. Researchers are even applying quantum concepts to the long-standing challenge of understanding turbulence. The chaotic motion of air and fluids affects weather patterns, climate systems, and aircraft performance. By studying superfluid helium, a substance that displays unusual quantum behavior, scientists are uncovering patterns that could improve climate modeling, storm prediction, and aviation safety. The Next Century of Quantum Discovery Despite a century of success, quantum mechanics continues to raise profound questions. Can gravity be quantized (i.e., does gravity behave like other forces at the quantum level)? Could quantum computers transform medicine and materials science? What new insights about the universe might emerge from future quantum technologies? Scully believes the search for answers is only beginning. "At the start of the 20th century, many thought physics was complete," he said. "Now, in the 21st century, we know the adventure is just beginning." Five Ways Quantum Mechanics Affects Everyday Life Lasers From grocery store scanners to eye surgery, lasers depend on quantum principles that amplify light. Secure communication Quantum cryptography can create highly secure codes that help protect sensitive information. Faster computing Quantum computers have the potential to solve certain problems in seconds that could take classical computers thousands of years. Better measurements Gravitational wave observatories use quantum techniques such as "squeezed light" to detect tiny distortions in spacetime and reveal new details about the universe. Medical breakthroughs Quantum imaging methods help scientists study viruses, molecules, and other biological structures at the atomic scale. RELATED TOPICS Health & Medicine Eye Care Medical Devices Medical Imaging Matter & Energy Physics Albert Einstein Optics Computers & Math Computers and Internet Computer Modeling Hacking RELATED TERMS Introduction to quantum mechanics Quantum computer Quantum entanglement Potential energy Computing Physics Solar power Edwin Hubble Story Source: Materials provided by Texas A&M University. Original written by Lesley Henton. Note: Content may be edited for style and length. Journal Reference: Marlan O. Scully, William G. Unruh. One hundred years of quantum mechanics. Science, 2025; 390 (6777): 998 DOI: 10.1126/science.ady6092 Cite This Page: MLA APA Chicago Texas A&M University. "Quantum mechanics once baffled scientists. Now it's changing the world." ScienceDaily. ScienceDaily, 5 July 2026. . Texas A&M University. (2026, July 5). Quantum mechanics once baffled scientists. Now it's changing the world. ScienceDaily. Retrieved July 13, 2026 from www.sciencedaily.com/releases/2026/06/260624025516.htm Texas A&M University. "Quantum mechanics once baffled scientists. Now it's changing the world." ScienceDaily. www.sciencedaily.com/releases/2026/06/260624025516.htm (accessed July 13, 2026). Explore More from ScienceDaily RELATED STORIES The 19th-Century Mathematical Clue That Led to Quantum Mechanics Mar. 9, 2026 More than a century before quantum mechanics was born, Irish mathematician William Rowan Hamilton stumbled onto an idea that would quietly foreshadow one of the deepest truths in physics. While ... Physicists Found a Way to Make Thermodynamics Work in the Quantum World Dec. 23, 2025 More than 200 years ago, Count Rumford showed that heat isn’t a mysterious substance but something you can generate endlessly through motion. That insight laid the foundation for thermodynamics, ... Quantum Theory and Thermodynamics: Maxwell's Demon? 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