Physicists Propose a 'Supercurrent' To Read Qubits Without Destroying Their Quantum State

Essentially, it involves reading the electrical current produced by a qubit, rather than the qubit itself.

Here, the researchers have proposed that qubits known as Andreev qubits could help.

Based on the researchers' calculations, Andreev qubits in superposition produce oscillating electrical currents without any external voltage needed – powered by the quantum behavior itself.

Andreev qubits have been extensively investigated before, but the idea of their electrical behavior producing a signal that can be read is new.

"Our method doesn't eliminate the fundamental problem of quantum measurement," says Egues.