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Entanglement is at the heart of quantum physics and future quantum technologies. Like other aspects of quantum science, the phenomenon of entanglement reveals itself at very tiny, subatomic scales. When two particles, such as a pair of photons or electrons, become entangled, they remain connected even when separated by vast distances.
Entanglement: This is a phenomenon that occurs when two or more objects are connected in such a way that they can be thought of as a single system, even if they are very far apart. The state of one object in that system can't be fully described without information on the state of the other object.
A different approach to quantum computing, called quantum annealing, is further along in development but limited to a specific kind of calculation. In this approach, a quantum computer housed in a cryogenic refrigerator uses thousands of qubits to quickly approximate the best solutions to complex problems.
The diagonal filter acts to "reset" the superposition of the light by making it more likely to be vertically polarized. One of the fundamental principles of quantum mechanics, superposition explains how a quantum state can be represented as the sum of two or more states.
New technologies that use properties of quantum mechanics have the potential to change how we think about encryption and computer cryptography in two main ways.
Caltech scientists explain the strange phenomenon of quantum entanglement in everyday language.
Caltech researchers explain how they design experiments using specialized tools and techniques to probe the elusive phenomena of quantum mechanics.
Learn about the basic concepts underlying the field of quantum science, including superposition, entanglement, and the uncertainty principle. Discover how quantum principles and our understanding of them have been harnessed to benefit society and catalyze new research across disciplines.
The generation of laser light relies on a technique called stimulated emission, in which a photon is used to stimulate an already excited atomic electron to drop down to a lower quantum energy state and release two identical photons that travel coherently.
How Will Quantum Science and Technology Change Materials, and Vice Versa? We asked Professor Nai-Chang Yeh, an experimental physicist and former Fletcher Jones Foundation co-director of Caltech's Kavli Nanoscience Institute, to answer this question.