The Intel Quantum SDK extends C++ with quantum kernels that mix classical and quantum operations, but which are compiled to quantum basic blocks executable near-term devices. The exact rules for how classical and quantum operations can mix are currently given as informal programming guidelines. This extended abstract proposes a type system targeting the Intel Quantum SDK’s runtime, drawing on ideas from modal and linear type systems. It uses three modes—compile-time, classical runtime, and quantum runtime—to ensure that data written by the quantum machine is not consumed in the same quantum kernel. We also give a compilation strategy to a runtime language with a goal of showing that well-typed programs are compiled to quantum basic blocks with the same semantics.