Interference from RF Communication Signals on Qubit Cavities and Quantum-Coherent Links in Cryogenic Enclosures

Characterize and quantify how RF communication fields propagate inside metallic cryocooler enclosures of quantum computers, leak into superconducting qubit cavities and quantum-coherent waveguides, and interfere with qubit operation; derive validated channel and interference models and mitigation strategies enabling reliable wireless control and readout without degrading quantum coherence.

Background

In cryogenic quantum computers, communications occur within a heavily enclosed metallic cryocooler, which causes RF fields to reverberate throughout the enclosure. This increases delay spread and poses risks to quantum operation.

The authors explicitly note that communication signals may leak into qubit cavities and quantum-coherent waveguides, potentially interfering in ways that are not yet fully understood, indicating a need for detailed modeling and mitigation.

References

On the one hand, it increases the delay spread significantly, limiting the speed of wireless links; on the other hand, the RF signals used to communicate might leak inside the qubit cavities and quantum-coherent link waveguides, interfering them in ways that are not yet fully understood.

— Electromagnetic Nanonetworks Beyond 6G: From Wearable and Implantable Networks to On-chip and Quantum Communication (2405.07812 - Abadal et al., 13 May 2024) in Section 3.3 Quantum Computing (Enclosed environment challenge)