The next level of experimental "cat state" claims involves putting lots of particles into the same superposition states. One of the earliest examples of this comes from a 2000 paper in Nature and ...

The state of the system "collapses" from an indeterminate state with a wavefunction spread over multiple possible outcomes to a definite single reality.

In other words, researchers can use the indeterminate state of whether or not a photon is in a crystal cavity to represent a qubit. The logic gates act on two qubits together, and can create ...