A scalable physical system with well characterized qubit.
The ability to initialize the state of the qubits to a simple fiducial state.
Long relevant decoherence times.
A "universal" set of quantum gates.
A qubit-specific measurement capability.
Di Vincenzo criteria
“The Di Vincenzo criteria are conditions necessary for constructing a quantum computer, conditions proposed in 2000 by the theoretical physicist David P. Di Vincenzo, as being those essential to building such a computer—a computer first submitted by mathematician Yuri Manin, in 1980, and physicist Richard Feynman, in 1982—as a means to efficiently simulate quantum systems, such as in solving the quantum many-body problem.”
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