A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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the study of the informational content of quantum states. The most common object of study is the "qubit", the information in a two-state quantum system such as spin-1/2 or photo…
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for questions relating to what, if anything, the quantum mechanical formalism and experimental results say about the way the world works.
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Quantum mechanics describes the microscopic properties of nature in a regime where classical mechanics no longer applies. It explains phenomena such as the wave-particle duality, quantization of energ…
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A research field within general optical physics concerned with light and its material interaction: where light is modelled by full quantum mechanical description.
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The quark model postulates that the hadrons such as protons and neutrons have an inner structure; quarks.
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a process in which energetic particles or energetic waves travel through a medium or space. The particles or waves radiate (i.e., travel outward in all directions) from a source.
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The property of some materials by which individual atoms decay, emitting energy or particles often transforming into different elements in the process.
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Randomness covers questions having to do with the concept of randomness in physical processes and questions about determinism vs indeterminism or interpretations thereof. Question related to concepts …
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a particular coordinate system chosen to represent physical entities. The notion is most often used in special and general relativity to dentoe particular coordinates chosen on th…
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Change in the direction of propagation of a wave when its transmitting medium changes.
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The union of special (SR) and general (GR) relativity. Use this tag if both SR and GR apply.