Superconducting microwave links have enabled deterministic state transfer and remote entanglement between qubits, but deterministic links have so far operated with an effectively two-dimensional transmitted Hilbert space. Here we demonstrate a superconducting qutrit link between two independently packaged nodes connected by a microwave channel. Each node combines a transmon qutrit, a transmission resonator, and a tunable Purcell-filter interface, allowing the two remote microwave-photon interfaces to be matched in both frequency and bandwidth. We implement two transition-selective photon-mediated operations that transfer the $|e\rangle$ and $|f\rangle$ qutrit components in distinct temporal modes of the same channel. We tomographically characterize arbitrary qutrit-state transfer, obtaining a mean transferred-state fidelity of 83.68% and a qutrit process fidelity of 77.12%, exceeding both the classical qutrit-transfer benchmark and the best possible average fidelity of an effective qubit channel used to transmit an arbitrary qutrit. Using partial-transfer operations, we reconstruct a remote two-qutrit state with negativity 0.730, a tomography-inferred dense-coding capacity of 2.273 bits, and a tomography-inferred Collins-Gisin-Linden-Massar-Popescu (CGLMP) parameter $I_3=2.332$ , all beyond the corresponding qubit or local bounds. These results demonstrate a superconducting microwave link that uses the native three-level structure of transmons as a genuine high-dimensional communication resource.Superconducting microwave links have enabled deterministic state transfer and remote entanglement between qubits, but deterministic links have so far operated with an effectively two-dimensional transmitted Hilbert space. Here we demonstrate a superconducting qutrit link between two independently packaged nodes connected by a microwave channel. Each node combines a transmon qutrit, a transmission resonator, and a tunable Purcell-filter interface, allowing the two remote microwave-photon interfaces to be matched in both frequency and bandwidth. We implement two transition-selective photon-mediated operations that transfer the $|e\rangle$ and $|f\rangle$ qutrit components in distinct temporal modes of the same channel. We tomographically characterize arbitrary qutrit-state transfer, obtaining a mean transferred-state fidelity of 83.68% and a qutrit process fidelity of 77.12%, exceeding both the classical qutrit-transfer benchmark and the best possible average fidelity of an effective qubit channel used to transmit an arbitrary qutrit. Using partial-transfer operations, we reconstruct a remote two-qutrit state with negativity 0.730, a tomography-inferred dense-coding capacity of 2.273 bits, and a tomography-inferred Collins-Gisin-Linden-Massar-Popescu (CGLMP) parameter $I_3=2.332$, all beyond the corresponding qubit or local bounds. These results demonstrate a superconducting microwave link that uses the native three-level structure of transmons as a genuine high-dimensional communication resource.

quant-pharXiv:2606.29475Jun 30, 20260 citations

Deterministic transfer for an unknown atomic entangled state via cavity QED

Yan Zhao, Yan-Lin Liao

The Journal of Atomic and Molecular SciencesJan 1, 20100 citations

Deterministic Generation of a Three-Qutrit GHZ State

Jinwon Yoo, Stefania Sciara, Nicola Montaut +2 more

Photonics North (PN)Jun 1, 20260 citations

Microwave-Assisted Resonant Collisional Energy Transfer in Na Rydberg States

Ravinder Kachru, Nam Huu Tran, Thomas F. Gallagher

Microwave-assisted resonant collisional energy transfer process $\mathrm{Na}(\mathrm{ns})+\mathrm{Na}(\mathrm{ns})+h\ensuremath{\nu}\ensuremath{\rightarrow}\mathrm{Na}(\mathrm{np})+\mathrm{Na}((n\ensuremath{-}1)p)$ is observed between two colliding $\mathrm{Na}(\mathrm{ns})$ atoms. The collisional resonance occurs when the microwave frequency $\ensuremath{\nu}$ equals the collisional energy defect $\frac{\ensuremath{\Delta}W}{h}$. The observed cross sections are very large (\ensuremath{\sim} ${10}^{8}$ ${\mathrm{\AA{}}}^{2}$ ) and require very low microwave power, \ensuremath{\sim}10 W/ ${\mathrm{cm}}^{2}$ . These observations are in good agreement with an intuitive two-photon absorption model for these collisions.Microwave-assisted resonant collisional energy transfer process $\mathrm{Na}(\mathrm{ns})+\mathrm{Na}(\mathrm{ns})+h\ensuremath{\nu}\ensuremath{\rightarrow}\mathrm{Na}(\mathrm{np})+\mathrm{Na}((n\ensuremath{-}1)p)$ is observed between two colliding $\mathrm{Na}(\mathrm{ns})$ atoms. The collisional resonance occurs when the microwave frequency $\ensuremath{\nu}$ equals the collisional energy defect $\frac{\ensuremath{\Delta}W}{h}$. The observed cross sections are very large (\ensuremath{\sim}${10}^{8}$ ${\mathrm{\AA{}}}^{2}$) and require very low microwave power, \ensuremath{\sim}10 W/${\mathrm{cm}}^{2}$. These observations are in good agreement with an intuitive two-photon absorption model for these collisions.

Physical Review LettersJul 19, 198215 citations

Preparation of arbitrary quantum states in a microwave resonator

M. Hofheinz

Bulletin of the American Physical SocietyMar 19, 20090 citations

|e\rangle

and

|f\rangle

qutrit components in distinct temporal modes of the same channel. We tomographically characterize arbitrary qutrit-state transfer, obtaining a mean transferred-state fidelity of 83.68% and a qutrit process fidelity of 77.12%, exceeding both the classical qutrit-transfer benchmark and the best possible average fidelity of an effective qubit channel used to transmit an arbitrary qutrit. Using partial-transfer operations, we reconstruct a remote two-qutrit state with negativity 0.730, a tomography-inferred dense-coding capacity of 2.273 bits, and a tomography-inferred Collins-Gisin-Linden-Massar-Popescu (CGLMP) parameter

I_3=2.332

, all beyond the corresponding qubit or local bounds. These results demonstrate a superconducting microwave link that uses the native three-level structure of transmons as a genuine high-dimensional communication resource.

\mathrm{Na}(\mathrm{ns})

atoms. The collisional resonance occurs when the microwave frequency $\ensuremath{\nu}$ equals the collisional energy defect $\frac{\ensuremath{\Delta}W}{h}$. The observed cross sections are very large (\ensuremath{\sim}

{10}^{8}

{\mathrm{\AA{}}}^{2}

) and require very low microwave power, \ensuremath{\sim}10 W/

{\mathrm{cm}}^{2}

. These observations are in good agreement with an intuitive two-photon absorption model for these collisions.