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Quantum computers provide faster solutions to specific compute-intensive classical problems. However, building a fault-tolerant quantum computer architecture is challenging and demands integrating several qubits with optimized signal routing while maintaining its quantum coherence. Experimental realization of such quantum computers with diverse functional components in a planar monolithic device architecture is challenging due to material and thermodynamic mismatch between various elements. Furthermore, it requires complex control and routing, resulting in parasitic modes and reduced qubit coherence. Thus, a scalable interposer architecture is essential to merge and interconnect different functionalities within a sophisticated chip while maintaining qubit coherence. As such, heterogeneous integration is an optimum solution to scale the qubit technology. We propose a heterogeneously integrated quantum chip optoelectronics interposer as a solution to the high-density scalable qubit architecture. Our technology is high-volume manufacturable and provides novel optical I/O solutions for on-chip, chip-to-chip, and cryogenic-to-outside world interconnect. 

We designed and simulated an electro-optic quantum frequency transducer based on coupled micro-disk resonators with a conversion rate exceeding 7.35 kHz and footprint below 60 × 120 μm2. The conversion efficiency can be increased to 13% with optimized design.