RAQM: Eight qubits stored in a single superconducting memory module

Researchers have now stored eight qubits within a single superconducting memory module, a development addressing a critical gap in quantum processor design. The work, a collaboration spanning SLAC and Fermi National Accelerator Laboratory alongside Stanford, University of Chicago, NYU, and Rutgers, realizes an 8-bit cascaded random access quantum memory. This architecture introduces a key feature absent in current systems: a functional equivalent to classical dynamic random access memory (DRAM), enabling resource-efficient control of qubits and separate optimization of logic and storage. The team demonstrates arbitrary random access with an average infidelity per mode, characterizing the many-body interactions that contribute to errors. A single transmon qubit now addresses eight memory modes within a newly realized superconducting system, a development promising to significantly reduce the control complexity of scaling quantum processors. This cascaded random access quantum memory (RAQM) architecture achieves this by layering a buffer interface between the processor and a multimode storage cavity, effectively multiplexing control resources and isolating storage from processor-induced nonlinearities. The…