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Hybrid quantum systems in which acoustic resonators couple to superconductingqubits are promising quantum information platforms. High quality factors andsmall mode volumes make acoustic modes ideal quantum memories, while thequbit-phonon coupling enables the initialization and manipulation of quantumstates. We present a scheme for quantum computing with multimode quantumacoustic systems, and based on this scheme, propose a hardware-efficientimplementation of a quantum random access memory (QRAM). Quantum information isstored in high-Q phonon modes, and couplings between modes are engineered byapplying off-resonant drives to a transmon qubit. In comparison to existingproposals that involve directly exciting the qubit, this scheme can offer asubstantial improvement in gate fidelity for long-lived acoustic modes. We showhow these engineered phonon-phonon couplings can be used to access data insuperposition according to the state of designated address modes--implementinga QRAM on a single chip.

Hardware-efficient quantum random access memory with hybrid quantum acoustic systems