  Quantum computers promise exponential speed ups over classical computers for
various tasks. This emerging technology is expected to have its first huge
impact in High Performance Computing (HPC), as it can solve problems beyond the
reach of HPC. To that end, HPC will require quantum accelerators, which will
enable applications to run on both classical and quantum devices, via hybrid
quantum-classical nodes. Hybrid quantum-HPC applications should be scalable,
executable on Quantum Error Corrected (QEC) devices, and could use
quantum-classical primitives. However, the lack of scalability, poor
performances, and inability to insert classical schemes within quantum
applications has prevented current quantum frameworks from being adopted by the
HPC community.
  This paper specifies the requirements of a hybrid quantum-classical framework
compatible with HPC environments, and introduces a novel hardware-agnostic
framework called Q-Pragma. This framework extends the classical programming
language C++ heavily used in HPC via the addition of pragma directives to
manage quantum computations.
