期刊
SCIENCE
卷 380, 期 6649, 页码 1030-1033出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.adg8715
关键词
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Linear optical quantum computing is an ideal approach to quantum computing, requiring only a small number of computational elements. The similarity between photons and phonons suggests the potential for using phonons instead of photons in linear mechanical quantum computing. In this study, we demonstrate a beam splitter element with single phonons by using two superconducting qubits for full characterization. We also show two-phonon interference using the beam splitter, a requirement for two-qubit gates in linear computing. This advances a new solid-state system for implementing linear quantum computing and provides a straightforward conversion between itinerant phonons and superconducting qubits.
Linear optical quantum computing provides a desirable approach to quantum computing, with only a short list of required computational elements. The similarity between photons and phonons points to the interesting potential for linear mechanical quantum computing using phonons in place of photons. Although single-phonon sources and detectors have been demonstrated, a phononic beam splitter element remains an outstanding requirement. Here we demonstrate such an element, using two superconducting qubits to fully characterize a beam splitter with single phonons. We further use the beam splitter to demonstrate two-phonon interference, a requirement for two-qubit gates in linear computing. This advances a new solid-state system for implementing linear quantum computing, further providing straightforward conversion between itinerant phonons and superconducting qubits.
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