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Any candidates for quantum computing hardware should be assessed against this ‘DiVincenzo checklist’ .
A number of two-level systems have been examined as candidates for qubits and quantum computation for recent few years.
These include ions in an electromagnetic trap, atoms in beams interacting with cavities, electronic states and spin states in quantum dots, nuclear spins in molecules or solids, charged states of nano-scale superconductors, flux states of circuits at superconducting condition, quantum Hall systems, electrons in superfluid helium and nano-scale magnetic particles.
