An integrated microwave-to-optics interface for scalable quantum computing

Matthew J. Weaver

doi:10.1038/s41565-023-01515-y

An integrated microwave-to-optics interface for scalable quantum computing

2023-10-05

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Alexandra C. Bernasconi

DOI：10.1038/s41565-023-01515-y

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Microwave-to-optics transduction is emerging as a vital technology for scaling quantum computers and quantum networks. To establish useful entanglement links between qubit processing units, several key conditions must be simultaneously met: the transducer must add less than a single quantum of input-referred noise and operate with high efficiency, as well as large bandwidth and high repetition rate. Here we present a design for an integrated transducer based on a planar superconducting resonator coupled to a silicon photonic cavity through a mechanical oscillator made of lithium niobate on silicon. We experimentally demonstrate its performance with a transduction efficiency of 0.9% with 1 mu W of continuous optical power and a spectral bandwidth of 14.8MHz. With short optical pulses, we measure the added noise that is limited to a few photons, with a repetition rate of up to 100kHz. Our device directly couples to a 50 Omega transmission line and can be scaled to a large number of transducers on a single chip, laying the foundations for distributed quantum computing. An integrated transducer based on a planar superconducting resonator coupled to a silicon photonic cavity through a mechanical oscillator made from lithium niobate achieves a transduction efficiency of 0.9%.

Keywords:

SUPERCONDUCTING-QUBIT

LITHIUM-NIOBATE

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An integrated microwave-to-optics interface for scalable quantum computing

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