qudit

Definitions

noun computing A quantum unit of information that may take any of d states, where d is a variable.

Compare qubit, qutrit.

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The generic term for such a system is "qudit," where 'd' refers to the number of energy levels -- in this case, 'd' equals five.

Next Big Future 2009
We used the qudit to emulate the dynamics of single spins with principal quantum number s = 1/2, 1, and 3/2, allowing a measurement of Berry's phase and the even parity of integer spins (and odd parity of half-integer spins) under 2-rotation.

Next Big Future 2009
We demonstrate the operation of a superconducting phase qudit with a number of levels d up to d = 5 and show how to manipulate and measure the qudit state, including simultaneous control of multiple transitions.

Next Big Future 2009
With qudits, each computational unit that previously encoded a qubit — such as a trapped ion or a photon — can suddenly pack in more information, helping the machines to scale up faster.

Meet ‘qudits’: more complex cousins of qubits boost quantum computing Davide Castelvecchi 2025
Now researchers are producing the first applications of ‘qudits’: units of information that offer combinations of three or more simultaneous states.

Meet ‘qudits’: more complex cousins of qubits boost quantum computing Davide Castelvecchi 2025