From the article:
“Somewhere between one and ten million qubits are needed for a fault-tolerant quantum computer, whereas IBM has only just realized a 1,200-qubit computer,” says Aoki.
While this approach isn’t limited to any specific platform for quantum computers, it does lend itself to trapped ions and neutral atoms since they don’t need to be cooled to cryogenic temperatures, which makes them much easier to connect.
A hybrid approach
Aoki and his team are investigating the possibility of using a hybrid quantum system of atoms and photons known as a cavity quantum electrodynamics (QED) system as a promising way to connect units. “Cavity QED provides an ideal interface between optical qubits and atomic qubits for distributed quantum computing,” says Aoki. “Recently, key building blocks for realizing quantum computers based on cavity QED, such as single-photon sources and various quantum gates, have been demonstrated using free-space cavities.”
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