Co-Designed Architectures for Modular Superconducting Quantum Computers

McKinney, Evan; Xia, Mingkang; Zhou, Chao; Lu, Pinlei; Hatridge, Michael; Jones, Alex K.

doi:10.1109/hpca56546.2023.10071036

Cited by 5 publications

References 44 publications

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Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router

Zhou

Praquin³

et al. 2023

npj Quantum Inf

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One of the primary challenges in realizing large-scale quantum processors is the realization of qubit couplings that balance interaction strength, connectivity, and mode confinement. Moreover, it is very desirable for the device elements to be detachable, allowing components to be built, tested, and replaced independently. In this work, we present a microwave quantum state router, centered on parametrically driven, Josephson-junction based three-wave mixing, that realizes all-to-all couplings among four detachable quantum modules. We demonstrate coherent exchange among all four communication modes, with an average full-iSWAP time of 764 ns and average inferred inter-module exchange fidelity of 0.969, limited by mode coherence. We also demonstrate photon transfer and pairwise entanglement between module qubits, and parallel operation of simultaneous iSWAP exchange across the router. Our router-module architecture serves as a prototype of modular quantum computer that has great potential for enabling flexible, demountable, large-scale quantum networks of superconducting qubits and cavities.

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Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router

Zhou

Praquin³

et al. 2023

npj Quantum Inf

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Integrating magnons for quantum information

Jiang,

Lim,

et al. 2023

Applied Physics Letters

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Magnons, the quanta of collective spin excitations in magnetically ordered materials, have distinct properties that make them uniquely appealing for quantum information applications. They can have ultra-small wavelengths down to the nanometer scale even at microwave frequencies. They can provide coupling to a diverse set of other quantum excitations, and their inherently gyrotropic dynamics forms the basis for pronounced nonreciprocities. In this article, we discuss what the current research challenges are for integrating magnetic materials into quantum information systems and provide a perspective on how to address them.

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