3-D integrated readout multiplexer and purcell filter for quantum computing

Applications: Quantum Computing, Quantum Networks, Wireless Communication, Internet of Things

Circuit quantum electrodynamics (cQED) is a promising platform for quantum computing, enabling the preparation of stable quantum states with good lifetimes. Oxford have applied microwave engineering concepts to provide high quality, low loss readout multiplexing and Purcell filtering of qubits in a single novel structure.

Features	Benefits
A novel off-chip structure for multiplexing signals from resonators of a circuit quantum electrodynamics device.	Increases coupling rate between qubits. Significantly reduces the quantum processor wiring and peripheral hardware overheads. Minimizes heat loads in the architecture.
The structure uses a modular 3-D architecture without need for wire bonding.	Scalable to large numbers of qubits. Flexibility to add/swap multiplexer components.
The device structure and the coupling to the resonators can be tuned to produce notch filtering at the qubit frequencies.	Provides effective Purcell filtering at qubit frequencies, maintaining quantum coherence. Demonstrated 0.5ms T1 for 16-way multiplexing.
Readout resonators are coupled via pillars that are conductively shielded from each other.	Allows fast readout from multiple qubits while supressing cross-talk between resonators.

Patented (WO2024189298) & available for:

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3-D integrated readout multiplexer and purcell filter for quantum computing

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