  To harness the power of quantum computing (QC) in the near future, tight and
efficient integration of QC with high performance computing (HPC)
infrastructure (both on the software (SW) and the hardware (HW) level) is
crucial. This paper addresses the development of a unified quantum platform
(UQP) and how it is being integrated into the HPC ecosystem. It builds on the
concepts of hybrid high performance computing - quantum computing (HPCQC)
workflows and a unified HPCQC toolchain, introduced in our previous work and
makes the next needed step: it unifies the low-level interface between the
existing classical HPC systems and the emerging quantum hardware technologies,
including but not limited to machines based on superconducting qubits, neutral
atoms or trapped ions. The UQP consists of three core components: a runtime
library, an instruction set architecture (ISA) and a quantum control processor
(QCP) micro-architecture. In particular, this work contributes a unified HPCQC
runtime library that bridges the gap between programming systems built on
quantum intermediate representation (QIR) standard with a novel, unified hybrid
ISA. It then introduces the initial extension of an ISA and QCP
micro-architecture to be platform and technology agnostic and enables it as an
efficient execution platform. The UQP has been verified to ensure correctness.
Further, our performance analysis shows that the execution time and memory
requirements of the runtime library scale super-linearly with number of qubits,
which is critical to support scalability efforts in QC hardware.
