(US) The fraction of a person's ancestors, out of their total ancestors, who are documented as full-blooded Native Americans. For instance, a person who has one parent who is a full-blood Native American and one who has no Native ancestry has a blood quantum of 1/2.

(metaphysics) The subjective experience of surviving quantum suicide, as a result of the observer surviving such a deadly experiment.

plural of quantum tomography

A laser that operates by analogy with an electronic waterfall, with electrons cascading down a series of small steps emitting a photon at each step.

(quantum mechanics) A solid in which small magnetic moments have a fluctuating random orientation, even at low temperature

(physics) A constant used as a unit of measurement for particle spin, equal to Planck's constant divided by 2π.

plural of quantum cascade laser

(physics) A theory which attempts to reconcile quantum mechanics and general relativity, according to which space can be regarded as an extremely fine fabric of finite loops.

(quantum mechanics) An effect marked by the quantization of the Hall resistance, observed in two-dimensional electron systems subjected to low temperatures and strong magnetic field.

(quantum mechanics) A method for describing a quantum process by probing with known quantum states.