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      Long-Range ZZ Interaction via Resonator-Induced Phase in Superconducting Qubits

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          Abstract

          Superconducting quantum computing emerges as one of leading candidates for achieving quantum advantage. However, a prevailing challenge is the coding overhead due to limited quantum connectivity, constrained by nearest-neighbor coupling among superconducting qubits. Here, we propose a novel multimode coupling scheme using three resonators driven by in-phase and quadrature microwaves, based on the resonator-induced phase gate, to extend the ZZ interaction distance between qubits. We demonstrate a CZ gate fidelity exceeding 99.9\% within 160 ns at free spectral range (FSR) of 1.3 GHz, and by optimizing driving pulses, we further reduce the residual photon to nearly 103 within 100 ns at FSR of 0.2 GHz. These facilitate the long-range CZ gate over separations reaching sub-meters, thus significantly enhancing qubit connectivity and making a practical step towards the scalable integration and modularization of quantum processors. Specifically, our approach supports the implementation of quantum error correction codes requiring high connectivity, such as low-density parity check codes that paves the way to achieving fault-tolerant quantum computing.

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          Author and article information

          Journal
          29 August 2024
          Article
          2408.16617
          f5f6df48-b2a4-4162-acad-aeabf4dd19d8

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Custom metadata
          7 pages, 4 figures
          quant-ph

          Quantum physics & Field theory
          Quantum physics & Field theory

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