Quantum random access memory with transmon-controlled phonon routing

Physical Review Letters (2025)

 

In this paper, scientists present a new design for quantum random access memory (QRAM), which allows a quantum computer to look up multiple memory locations at once in a superposition.

The team proposes using an architecture of tiny devices that route sound waves (phonons) based on the state of a quantum element called a transmon. Their design is small, fast, and avoids technical issues such as frequency collisions. They also introduce a way to detect common energy loss errors without needing extra hardware.

Their analysis shows the system could work well using today’s technology, with performance limited mostly by how long the transmons can hold maintain phase coherence of their quantum state.

The paper authors are Zhaoyou Wang, Hong Qiao, Andrew Cleland and Liang Jiang, who conducted their work at the University of Chicago and Argonne National Laboratory.