The Divincenzo’s criteria is a list of necessary request for constructing a quantum computer, which is proposed by Professor David P.DiVincenzo in 20001. During the last nearly two decades, various quantum candidates have being developed or put forward, meet the criteria more or less.
The DiVincenzo criteria consist of 5+2 conditions that an experimental setup must satisfy in order to successfully implement quantum algorithms.
The additional 2 conditions are for quantum network.
Here a summary is drawn from the roadmap in 20022, which gives comparison bwtween all the popular quantum computation candidates.
| candidates | #1 | #2 | #3 | #4 | #5 | #6 | #7 |
|---|---|---|---|---|---|---|---|
| Trapped ions | $\star$ | $\bullet$ | $\star$ | $\bullet$ | $\bullet$ | $\star$ | $\star$ |
| Neutral atoms | $\star$ | $\bullet$ | $\star$ | $\star$ | $\star$ | $\star$ | $\star$ |
| Photonics | $\bullet$ | $\star$ | $\bullet$ | $\star$ | $\star$ | $\star$ | $\bullet$ |
| Flux qubit | $\star$ | $\bullet$ | $\star$ | $\star$ | $\star$ | $\triangle$ | $\triangle$ |
| Cavity QED | $\triangle$ | $\bullet$ | $\star$ | $\bullet$ | $\bullet$ | $\star$ | $\star$ |
| NMR | $\triangle$ | $\star$ | $\star$ | $\bullet$ | $\star$ | $\triangle$ | $\triangle$ |
| Silicon | $\star$ | $\star$ | $\star$ | $\star$ | $\star$ | $\triangle$ | $\triangle$ |
$\triangle$: no protocol $\star$: theoretically possible $\bullet$: realized and verified by experiments
We can see the photonic realization among all the physics system is still possible to demonstrate a quantum computer. But as we all know, it is hard to make photon interact with other photons, i.e, it is still desirable to introduce new mechanics beyond current post-selection protocol.