The experimental setup of the ETH researchers. The trap chip is located inside the container underneath the silver cupola, in which a lens captures the light emitted by the trapped ions. Credit: ETH Zurich / Pavel Hrmo
Researchers at ETH have now created an ion trap on a microfabricated chip using only static fields – an electric field and a magnetic field – in which quantum operations can be performed. In this way, it has been possible in recent years to build quantum computers with ion traps containing around 30 qubits. Much larger quantum computers, however, cannot straightforwardly be realized with this technique. The oscillating fields make it difficult to combine several such traps on a single chip, and using them heats up the trap – a more significant problem as systems get larger. Meanwhile, transport of ions is restricted to pass along linear sections connected by crosses.
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