Scientists have been debating D-Wave's quantumness since the company
announced its first device in 2004. It is an argument that continues
both online, in blog posts and forums, and in scientific journals.

One side argues there is too much noise in the D-Wave system, which
prevents consistent entanglement. But in an adiabatic device, certain
types of entanglement are not as vital as they are in the traditional
model of a quantum computer.

Some researchers are attempting to solve this conundrum by proving the
presence or absence of entanglement. If they show entanglement is
absent, that would be the end of the discussion. On the other hand,
even if some of D-Wave's qubits are entangled, this doesn't mean the
device is taking advantage of it.

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