Quantum Chip Creates Entanglement Across Six Sound Modes and Transfers It Between Resonators

Two acoustic resonators share a quantum advance

A research team led by Dian Tan at the Shenzhen International Quantum Academy, working with the University of Stuttgart and other institutions, has created quantum entanglement involving two, four and six acoustic modes on a hybrid chip. The team also transferred entangled states involving two and four modes between two separate mechanical resonators, demonstrating both the preparation and movement of quantum information carried by vibrations.

The strongest result for preparing an entangled state was a fidelity of 0.912 ± 0.003 for two modes. Fidelity measures how closely an experimental quantum state matches the intended state, with 1 representing a perfect match. The corresponding values were 0.790 ± 0.003 for four modes and 0.570 ± 0.001 for six modes.

The study in Science, titled Deterministic generation and distribution of genuine multipartite entanglement in macroscopic acoustic resonators, carries a publication date of October 15, 2026. The Shenzhen institute announced the work on October 16.

The experiment brings together three tasks that a larger acoustic quantum system would need: creating shared quantum states, moving them between hardware units and measuring them. Its most ambitious state involved six acoustic modes, while its transfer experiments involved two and four modes.

How vibrations carry quantum information

The chip uses phonons, the quantum units of mechanical vibration. A phonon plays a role in vibrations comparable to the role a photon plays in light: it describes a discrete amount of energy in a quantum system.

The mechanical devices are high overtone bulk acoustic resonators, or HBARs. Each supports many acoustic modes, meaning distinct patterns of vibration at different frequencies. An instrument can support several musical notes; a resonator similarly supports several vibration patterns, although controlling their quantum states requires much more precise equipment.

HBARs are attractive to researchers because they combine multiple modes, relatively long storage lifetimes and compatibility with chip integration. Several modes inside one device can provide several places to encode quantum information, reducing the need for a separate mechanical component for every mode.

What makes the entanglement genuine?

Tan and his colleagues generated genuine multipartite entanglement. In simple terms, the quantum connections belong to the entire group of participating modes. The state cannot be divided into independent smaller groups that contain all of its entanglement.

For example, six modes arranged as three independent entangled pairs would have a different structure from genuine entanglement shared across all six. The latter gives researchers a collective quantum resource that could support operations spanning several parts of a processor or network.

Tan described this shared connection as a resource for quantum networks with multiple nodes and for distributed quantum information processing. A node is an individual unit that can hold or process quantum information. Distributed processing would divide a task among connected units.

The paper's authors describe their experimental achievement in its abstract:

We report the generation and transfer of genuine multimode entanglement across two multimode acoustic resonators.

The hardware therefore addresses both the creation of a collective state and the ability to move that state between distinct mechanical devices. Those are separate requirements for connecting acoustic quantum components into a larger system.

A superconducting qubit controls several modes

The researchers coupled the acoustic resonators to tunable superconducting qubits. A qubit is a controllable quantum information unit. In this experiment, the qubits provide a way to prepare, manipulate and measure the mechanical quantum states.

The team carefully designed the distribution of acoustic mode frequencies and the interaction between qubits and phonons. This allowed one superconducting qubit to interact strongly with multiple mechanical modes, giving researchers access to several vibration patterns through a shared control element.

Strong coupling means the interaction is sufficient for controlled exchanges of quantum information before losses and unwanted disturbances overwhelm the process. Selecting and controlling several modes is central to turning a resonator's many vibration patterns into useful quantum resources.

The resulting architecture combines different kinds of quantum hardware: mechanical resonators hold acoustic states, superconducting qubits control them, and a tunable quantum coupler connects parts of the circuit. Integrating these elements on a chip is the basis of the team's proposed modular design.

What the preparation figures show

The Science paper reports the following fidelities for preparing the target entangled states:

• Two modes: 0.912 ± 0.003, or 91.2% fidelity.
• Four modes: 0.790 ± 0.003, or 79.0% fidelity.
• Six modes: 0.570 ± 0.001, or 57.0% fidelity.

The decrease makes the cost of greater complexity visible. Moving from two to six participating modes reduced the measured fidelity by 34.2 percentage points. More modes expand the size of the shared quantum state, while also increasing the demands on preparation and control.

Fidelity describes the resemblance between the measured state and the target state. The uncertainty shown after each value gives the reported uncertainty in that measurement. The researchers identify all three prepared states as genuinely entangled.

The authors also describe their approach as deterministic. This means preparation is designed to occur through a controlled sequence, instead of depending on selecting occasional successful random events. Deterministic operation and fidelity describe different aspects of performance: a controlled preparation sequence can still produce an imperfect state.

Moving entanglement between mechanical nodes

The transfer experiment used two separate HBAR resonators integrated with superconducting qubits and a tunable coupler in the same hybrid chip architecture. The team exchanged quantum information between the resonators and transferred entangled states from one mechanical node to the other.

For states involving two modes, the reported transfer fidelity was 0.785 ± 0.006. For states involving four modes, it was 0.601 ± 0.006. Expressed as percentages, those values are 78.5% and 60.1%.

The transfer results extend the experiment beyond preparing entanglement within the acoustic hardware. They demonstrate a route for moving a shared quantum state to another resonator, a necessary operation when different nodes must store or process different parts of a computation.

The reported transfer demonstrations cover two and four modes; extending transfer to six modes is a further task. The demonstrated connection is between resonators on the same chip, with the proposed larger network built by adding more connected hardware units.

Two qubits measure a larger acoustic state

The researchers also developed a method for quantum state tomography that reuses superconducting qubits across several acoustic modes. Tomography reconstructs a quantum state from many measurements made on repeated preparations of the experiment.

This step matters because producing a control sequence is only part of an experiment. Researchers need measurements that reveal the state they actually created, including the correlations between its different modes.

The team used just two superconducting qubits to perform tomography of the multimode entangled phonon states. By reusing those measurement resources across different modes, they avoided assigning a separate measurement qubit to every acoustic mode.

Tan described the result as the largest experimental characterization of multimode phonon states reported on a quantum acoustics platform at the time. That claim concerns the scale of state reconstruction. The practical contribution is a measurement method that makes fuller use of a limited number of qubits as the acoustic system grows.

Why the chip layout matters

The team's two dimensional chip architecture addresses a physical constraint in expanding these experiments. Traditional designs relying on three dimensional microwave cavities face space and engineering demands when researchers try to connect more components.

Tan said the chip approach offers modularity, integration and room for expansion. The proposed arrangement would couple individual superconducting qubits to separate mechanical resonators, then link the qubits through controllable couplers.

Each added resonator could contribute multiple acoustic modes. The design therefore offers two directions for growth: connecting more resonator nodes and using more of the modes supported by each resonator.

The preparation and transfer figures also show the work still required. Fidelity fell as the number of participating modes increased, and the demonstrated transfer fidelities were lower than the corresponding preparation values. A larger processor would need to preserve useful states while increasing both the number of modes and the number of connections.

From this experiment to a larger network

The immediate achievement is a laboratory platform that combines multimode entanglement, transfer between mechanical nodes and state reconstruction. Its sequence of demonstrated and proposed steps is:

• October 15, 2026: The Science publication records preparation of genuine entangled states involving two, four and six modes, and transfer involving two and four modes.
• October 16, 2026: The Shenzhen institute announces the collaboration's results and describes its approach to control and measurement.
• Next proposed stage: Add more HBAR resonators and superconducting qubits, connected through controllable couplers, to expand the available entanglement resources.

The team has given no date for a larger network. Its proposal builds directly on the demonstrated hardware: use resonators as modules, their acoustic modes as quantum resources, and superconducting circuits as the means of controlling and connecting them.

For quantum computing research, the contribution is concrete. The experiment shows how several vibration modes can share a genuine quantum state, how an entangled state can move between resonators, and how two qubits can help reconstruct a larger acoustic state. Better fidelity and more connected nodes are the next requirements for extending that approach.

Key Points

• Dian Tan's team and international collaborators prepared genuine entanglement involving two, four and six acoustic modes.
• Preparation fidelities were 91.2%, 79.0% and 57.0%, respectively.
• Entangled states involving two and four modes were transferred between separate resonators, with fidelities of 78.5% and 60.1%.
• Two superconducting qubits were reused to reconstruct the multimode phonon states through tomography.
• The team proposes expanding the chip architecture with more resonators, qubits and controllable connections.