Quantum networks get a boost from a memory that stores high-dimensional qubits

Researchers at South China Normal University in Guangzhou have demonstrated a quantum memory capable of storing high-dimensional qudits, using an approach different from single-qubit methods. Operating on 11-dimensional spatial modes, the memory achieves over 80% efficiency and greater than 99% qubit storage fidelity. This high-performance system, developed with affiliations at the Guangdong-Hong Kong Joint Laboratory of Quantum Matter and the Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area, estimates a distribution of 3.56 ± 0.16 bits of quantum information over 1000 kilometers in one minute. A new quantum memory developed by researchers at South China Normal University achieves over 80%…