Strained Germanium Could Carry Quantum Information Between Distant Qubits
Simulations suggest buried acoustic waves could turn strained germanium into a compact quantum bus, linking distant qubits without piezoelectric transducers. In a recent research article published in the journal APL Quantum, researchers at the University of Warwick, UK, introduced Quantum Phononic Links (QPLs), an architecture that uses compressively strained germanium on silicon (cs-GoS) and is designed to support scalable, coherent, long-range coupling of hole-spin qubits via engineered phononic waveguides and cavities. Quantum Phononic Link Concept Scalable quantum computing using semiconductor spin qubits demands coherent coupling between qubits separated by distances beyond immediate neighbors. Among candidate platforms, hole spin qubits in cs-GoS are especially compelling due to their long coherence times, strong spin–orbit interaction, and compatibility with CMOS fabrication processes.
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