The inner life
Quantum Superposition
Direct answer
Quantum Superposition: Quantum superposition is the principle that a quantum system can exist in a combination of several distinct states at once, each with its own weight, until a measurement gives one of them.
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At a glance
- Also called
- superposition principle, superposition of states, two states at once
- Found in
- Consciousness & Spiritual Psychology
- Related
- Schrödinger's Cat, Wave Function, Double-Slit Experiment, Quantum Entanglement
Quantum superposition is the principle that a quantum system can exist in a combination of several distinct states at once, each with its own weight, until a measurement gives one of them.
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What is quantum superposition in simple terms?
If a quantum system can be in state A and can be in state B, it can also be in a weighted sum of the two. An electron's spin can be a combination of up and down; a photon can be in a combination of two paths. The weights fix the odds of each result when the system is measured, and they can also cancel or reinforce, which is what produces interference.
A superposition is not the same as ignorance of which state holds, and it is not quite both at once in the everyday sense either; it is a third kind of condition with no familiar counterpart. Superpositions are fragile. Contact with air, light or heat carries the delicate relation between the parts off into the surroundings, a process called decoherence, within a tiny fraction of a second for anything large. That is why chairs and people are never found in two places.
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What sets Quantum Superposition apart
The detail that carries the weight is phase. The parts of a superposition are added with amplitudes that have a sign or angle as well as a size, and it is the relation between those angles that lets alternatives cancel. A coin hidden under a cup has odds but no phases, so its two possibilities can never interfere; a photon in two paths has both, and does. Lose the phase relation to the environment and the superposition becomes, for every practical purpose, an ordinary either-or.
- Rule: if A and B are possible states, any weighted sum of them is one too
- Textbook statement: Paul Dirac, The Principles of Quantum Mechanics, 1930
- Sign of it: interference between the alternatives
- What ends it: decoherence through contact with the surroundings
- Applied in: the qubit of a quantum computer
Often mistaken for something else: Entanglement is a superposition shared by two or more systems so that neither has a state of its own; plain superposition concerns the states of a single system.
The story behind Quantum Superposition
The principle was built into quantum mechanics by its founders in 1925 and 1926, and Paul Dirac gave it pride of place in The Principles of Quantum Mechanics (1930). Schrödinger's cat of 1935 dramatised what it would mean for large things. Heinz-Dieter Zeh in 1970 and Wojciech Zurek in the 1980s developed the theory of decoherence. Laboratories have since put atoms, superconducting circuits and large molecules into superpositions.
Why Quantum Superposition matters
Quantum Superposition is the feature that separates quantum from everyday physics, and the working principle of quantum computers.
How to read Quantum Superposition
Engineers prepare and protect superpositions in qubits, the units of quantum computing; in common speech the word is a metaphor for being undecided.
Quantum Superposition in practice: an example
A reader who says they are in superposition about a decision is borrowing the word; an undecided mind is unsure, not in two states.
Where readings of Quantum Superposition go wrong
Quantum Superposition applies to carefully isolated systems; it does not mean a person exists in several lives or can pick an outcome by intent.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Consciousness & Spiritual Psychology
- Aliases
- superposition, superposition principle, quantum superposition meaning, superposition of states, two states at once
- Last updated
- 2026-09-26
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Common questions
What is quantum superposition in simple terms?
It is a state made by adding other states together. A particle in a superposition of two positions is not secretly in one of them; it is in a combination that gives set odds for each when measured.
Why do we not see superposition in everyday objects?
Because large objects constantly interact with their surroundings. Those interactions destroy the coherence of a superposition almost instantly, a process called decoherence, leaving ordinary definite states.
How is superposition used in quantum computing?
A quantum bit can be held in a superposition of 0 and 1. Algorithms arrange for the weights of wrong answers to cancel and those of right answers to add, which for some problems beats ordinary computers.
