Infleqtion and UW–Madison Demonstrate 99.93% Qubit Readout Fidelity via Quadrupole Transition

Infleqtion and the University of Wisconsin–Madison have demonstrated a nondestructive measurement technique for neutral-atom qubits, achieving a readout fidelity of 99.93% and an atom retention rate of 99.54%. The research, published in Physical Review Letters, utilizes a “forbidden” electric-quadrupole (E2) transition in cesium (Cs) atoms to perform background-free imaging while simultaneously cooling the qubit array. […]

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