noun ·Uncommon ·Advanced level

Definitions

Noun

1. 1
   A quantum bit; the basic unit of quantum information described by a superposition of two states; a quantum bit in a quantum computer capable of being in a state of superposition; A binary qudit.

   "Quantum computing, on the other hand, is based on quantum bits, or qubits."

Synonyms

All synonyms

qbitquantum bitquantum bit

Example

More examples

"Quantum computing, on the other hand, is based on quantum bits, or qubits."

Etymology

Blend of quantum + bit, a play on cubit (“historical unit of length”). Coined by American physicist Benjamin Schumacher in 1995.

Related phrases

sub-qubitquantum bitquantum computer

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.