A research team at the University of Warwick believes it has found a new way to connect the “brains” of future quantum computers—without redesigning everything from the ground up. Their idea targets one of the most stubborn bottlenecks in scaling up: how to make qubits communicate efficiently across large distances on a single chip.
Instead of relying on nearby qubits talking directly, the researchers propose Quantum Phononic Links (QPLs), which use sound-like vibrations to carry quantum information. In this approach, specially engineered vibrational modes—phonons—function as a quantum “bus,” letting distant qubits exchange information while staying integrated with semiconductor materials.
The work, published in APL Quantum, focuses on hole spin qubits embedded in a compressively strained germanium on silicon platform (cs-GoS). The material’s engineered strain makes the qubits unusually sensitive to tiny lattice vibrations within the thin germanium layer, enabling controlled transfer of quantum states through the crystal itself.
Long-range connectivity is essential because practical quantum processors are expected to coordinate millions of qubits spread across an entire wafer, not just clusters that sit next to one another. By turning phonons into an on-chip communication channel, QPLs aim to extend coupling beyond what today’s architectures can manage through direct neighbor interactions.
Importantly, the team argues their phonon-based wiring can, in principle, span an exceptionally large area—potentially connecting qubits separated across a semiconductor chip with diameters up to 300 mm. That scale matters for manufacturing realities, where uniformity and integration with standard processes can determine whether a concept ever leaves the lab.
Compared with earlier long-distance strategies that often require additional hardware—such as microwave components or externally generated surface acoustic waves—QPLs are designed to be built into the semiconductor stack hosting the qubits. The promise: a more compact, potentially lower-cost route to scalability that aligns with established fabrication methods.
As Dr Maksym Myronov of Warwick puts it, the key challenge is long-range qubit connectivity, and QPLs offer a mechanism for distant exchange while remaining compatible with semiconductor technology. If experimental implementations match theoretical expectations, phonons could become an unlikely but powerful infrastructure layer for quantum computing.
ENDS
Subject of Research: Quantum Phononic Links (QPLs) for long-range on-chip coupling of hole spin qubits using phonons in compressively strained germanium on silicon.
Article Title: Quantum phononic links for on-chip long-range coupling of hole spin qubits in compressively strained germanium on silicon
News Publication Date: 15-Jun-2026
Web References: https://doi.org/10.1063/5.0332643
References: DOI: 10.1063/5.0332643 (APL Quantum)
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Keywords: quantum computing, qubit connectivity, phonons, on-chip communication, quantum phononic links, semiconductor quantum technologies, germanium on silicon, hole spin qubits
