PROPOSAL READS AN ANDREEV QUBIT'S STATE THROUGH ITS SUPERCURRENT AND A SQUID, WITH NO ANCILLA QUBITS

Summary from the TLDR Hardware newsletter

A theory paper proposes reading an Andreev qubit without ancilla qubits: its state shows up as an oscillating supercurrent in a large superconducting loop, and a small coil coupled to a SQUID picks up the magnetic signal. The method still disturbs the qubit, but within standard error-correction thresholds. It's a proposal in Physical Review B, supported by FAPESP, with no experiment yet.