2026-10-28 · arXiv Quantum Physics
arXiv:2512.17588v4 Announce Type: replace
Abstract: This paper presents an on-chip nonreciprocal space-time-periodic Josephson frequency multiplier that up-converts a single low-frequency input tone into a comb of high-order harmonics while enforcing directional signal propagation along the bus. We show that the harmonic content and bandwidth of the generated comb can be controlled through the applied DC and RF flux bias, and that individual output channels can be selectively addressed by tuning the bus operating point. We characterize the resulting nonreciprocal isolation between channels and discuss the associated design trade-offs, including the influence of modulation depth on harmonic-generation efficiency and back-reflection. The proposed device delivers multiple mutually isolated frequency channels from a single low-frequency source and it is well suited to applications requiring multiplexed delivery of tones to spatially distributed, frequency-addressable loads; we discuss multiplexed control of superconducting qubits as one such potential application area. Master-equation simulations of a four-qubit array driven by the harmonic comb, together with a one-dimensional line model of the directional conversion, quantify the resulting crosstalk and directional asymmetry; all results are simulations, and no experimental demonstration is claimed. The proposed architecture offers a compact, integrated route toward on-chip frequency multiplexing and directional isolation for cryogenic microwave systems.
原文链接：https://arxiv.org/abs/2512.17588
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