The DiVincenzo’s criteria is a list of necessary requests 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 been developed or put forward, meeting 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 between 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 systems is still possible to demonstrate a quantum computer. But as we all know, it is hard to make photons interact with other photons, i.e., it is still desirable to introduce new mechanics beyond current post-selection protocol.