What Are the Most Under-Discussed Security Risks in Quantum Computing Stacks?

Security of quantum computers is becoming a field of its own.

Beyond classical cyber risks, QC stacks face unique challenges: scheduler isolation, control electronics, SDK/API risks, firmware trust, multi-tenant cloud QC issues, and potential side-channel exposure.

What risks (or mitigations) do you think are currently underestimated?

Research, observations, and practitioner experience are all welcome.