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The numerical simulation of quantum circuits is an indispensable tool fordevelopment, verification and validation of hybrid quantum-classical algorithmson near-term quantum co-processors. The emergence of exascale high-performancecomputing (HPC) platforms presents new opportunities for pushing the boundariesof quantum circuit simulation. We present a modernized version of the TensorNetwork Quantum Virtual Machine (TNQVM) which serves as a quantum circuitsimulation backend in the eXtreme-scale ACCelerator (XACC) framework. The newversion is based on the general purpose, scalable tensor network processinglibrary, ExaTN, and provides multiple configurable quantum circuit simulatorsenabling either exact quantum circuit simulation via the full tensor networkcontraction, or approximate quantum state representations via suitable tensorfactorizations. Upon necessity, stochastic noise modeling from real quantumprocessors is incorporated into the simulations by modeling quantum channelswith Kraus tensors. By combining the portable XACC quantum programming frontendand the scalable ExaTN numerical backend we introduce an end-to-end virtualquantum development environment which can scale from laptops to future exascaleplatforms. We report initial benchmarks of our framework which include ademonstration of the distributed execution, incorporation of quantumdecoherence models, and simulation of the random quantum circuits used for thecertification of quantum supremacy on the Google Sycamore superconductingarchitecture.

Tensor Network Quantum Virtual Machine for Simulating Quantum Circuits at Exascale