Researchers Protect Quantum Data during Storage with Noise Correction

Researchers at Shanghai Jiao Tong University, in collaboration with Anhui University, Hefei National Laboratory, and Shanghai Research Center for Quantum Sciences, have developed a new protocol to preserve the precision of quantum measurements during storage. Quantum metrology relies on maintaining Heisenberg-limited precision, but current error correction methods largely address noise during signal encoding, neglecting degradation that occurs when a quantum probe is stored before measurement. This team proposes a correlated-noise correction (CNC) protocol which converts memory errors into measurable syndromes via entanglement with auxiliary qubits, protecting the accumulated metrological information against various noise types including dephasing, bit-flip, and amplitude-damping. Importantly, the research demonstrates that preserving quantum Fisher information, a key…