Chinese Scientists Achieve Progress in Quantum Acoustics
Chinese researchers have achieved a breakthrough in quantum acoustics, successfully generating and transmitting complex, multi-mode entangled states between separate components.
A team of Chinese scientists, led by academician Yu Dapeng and including researchers from the Shenzhen Institute for Quantum Science and Engineering and the University of Stuttgart in Germany, has made significant progress in the field of quantum acoustics. They have successfully generated and transmitted complex, multi-mode entangled states between separate components on a scalable quantum chip platform.
The research, published in "Science", utilized two High-Bulk Acoustic Resonators (HBARs) coupled with superconducting qubits. The team managed to prepare and characterize multi-mode, genuine multipartite entangled states within two separate HBAR components. These entanglements, involving two, four, and six modes, were achieved with high fidelity, reaching up to 0.912. They further demonstrated the transmission of two- and four-mode entangled states between the HBAR components with fidelities of 0.785 and 0.601, respectively.
Genuine entanglement, as highlighted in the study, signifies a deeper quantum correlation that cannot be reduced to independent lower-order entanglements. This multi-mode entanglement is a crucial resource for building multi-node quantum networks and distributed quantum information processing systems. HBARs, with their capacity for multiple modes and long lifetimes, are seen as a key component for constructing next-generation quantum information processing platforms.
This new experimental approach differs from traditional methods that often rely on complex three-dimensional structures. Instead, the research group integrated HBAR resonators, qubits, and couplers onto a single two-dimensional quantum chip. This approach overcomes previous spatial and engineering limitations while enabling the transmission of multi-mode entanglement across different quantum nodes. This achievement marks a shift in quantum acoustics research from manipulating a few mechanical modes to enabling scalable, multi-mode, and multi-node quantum information processing via phonons.