Researchers at the University of New South Wales (UNSW) in Australia have demonstrated a compact sensor for accessing information stored in the electrons of individual atoms.
The team thinks quantum bits (qubits) built from electrons hosted on single atoms in semiconductors hold promise as a large-scale quantum computing platform; the approach involves generating qubits by precisely positioning and encapsulating individual phosphorus atoms within a silicon chip.
This was complicated by the need to add in the various connections and gates required to scale up the atomic architecture.
Integrating a read-out sensor into a control gate halved the minimum requirement for four gates for each qubit.
Said UNSW's Prasanna Pakkiam, "By integrating a superconducting circuit attached to the gate, we now have the sensitivity to determine the quantum state of the qubit by measuring whether an electron moves between two neighboring atoms."
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