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p
 probability amplitude
“Probability amplitude” is a term used in quantum physics. It’s a number that appears in Schrodinger’s Wave Equation. Let’s(...)  Read More

q
 QFT
See Quantum Field Theory.  Read More
 quantities of dimension one
For “quantities of dimension one,” see “dimensionless number.”  Read More
 quantum
One definition of “quantum” is: a tiny packet of energy at the atomic level. A quantum is the smallest possible unit of(...)  Read More
 quantum angular momentum
For quantum angular momentum, see angular momentum.  Read More
 quantum decoherence
For quantum decoherence, see decoherence.  Read More
 quantum entanglement
What is quantum entanglement? {This article is under construction.]
In quantum physics, if two particles are entangled,(...)  Read More
 Quantum Field Theory
Quantum Field Theory (QFT) is the current theory of how atomic and subatomic particles behave. It is the most uptodate(...)  Read More
 quantum mechanics
In quantum mechanics, physicists study how tiny particles behave. These include atoms, the components of atoms like(...)  Read More
 quantum number
Electrons have a few handfuls of properties. Four have been selected as the electron’s “quantum numbers.” The quantum(...)  Read More
 quantum physics
For an understanding of quantum physics, see the definition of "quantum mechanics." Often, the two terms are used to mean(...)  Read More
 quantum randomness
Many quantum physicists view quantum mechanics as differing from classical physics in a fundamental way—quantum mechanics is(...)  Read More
 quantum spin
See "spin."  Read More
 quantum theory
“Quantum theory” is the original name for the field that became known as “quantum mechanics" (which see). The connotations(...)  Read More

r
 random
In classical physics, events are random only due to insufficient information. Let’s take the example of a coin toss. With an(...)  Read More
 renormalization
Renormalization is a technique for achieving greater precision in certain physics theories.* In quantum mechanics,(...)  Read More
 rotational momentum
Rotational momentum is the same thing as “angular momentum.” It is the momentum or oomph that an object has when it rotates(...)  Read More

s
 scanning tunneling microscope
A scanning tunneling microscope (STM) is a type of electron microscope. It is much more powerful than an ordinary microscope(...)  Read More
 Schrodinger's Cat Experiment
[This article is under construction.]
The Schrodinger Cat(...)  Read More
 singularity
“Singularity” has a physics definition and a mathematical definition. Both definitions are given here. They fit together(...)  Read More