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

• URL: http://arxiv.org/abs/2109.06848v4
• Date: Tue, 30 May 2023 19:56:32 GMT
• Title: Realizing all-to-all couplings among detachable quantum modules using a microwave quantum state router
• Authors: Chao Zhou, Pinlei Lu, Matthieu Praquin, Tzu-Chiao Chien, Ryan Kaufman, Xi Cao, Mingkang Xia, Roger Mong, Wolfgang Pfaff, David Pekker and Michael Hatridge
• Abstract summary: We present a microwave quantum state router, centered on 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 764ns and average inferred inter-module exchange fidelity of 0.969, limited by mode coherence. 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.
• Score: 1.2402408527122377
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 764ns 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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