Seminar of the Quantum Information Working Group: Jean-Philip Piquemal (Laboratoire de Chimie Théorique, Sorbonne Université)

phlam Vie du laboratoire Séminaire
Amphitheater Pierre Glorieux

The "Maison de la Simulation" and the "Quantum Information and Quantum Computing" working group invite you to a seminar given by Jean-Philip Piquemal (Laboratoire de Chimie Théorique, Sorbonne University)

Zoom link for virtual broadcasting: https://univ-lille-fr.zoom.us/j/95889688614?pwd=UUtmckVHUVlkbGRSQm14em5GZ2VRdz09

14:00-14:45: Jean-Philip Piquemal (Laboratoire de Chimie Théorique, Sorbonne Université)

Title: Hybrid quantum-classical Adaptive Variational Quantum Eigensolvers for quantum chemistry

Abstract:

Hybrid quantum-classical Adaptive Variational Quantum Eigensolvers (VQE) hold the potential to outperform classical computing for simulating quantum many-body systems. However, their practical implementation on current quantum processing units (QPUs) faces challenges in measuring a polynomially scaling number of observables during the operator selection so as to optimise a high- dimensional and noisy cost function. In this talk, I will present an extension of the ADAPT-VQE strategy denoted Overlap-ADAPT-VQE. The algorithm iteratively generates a compact quantum approximation of a classical target wave function through a quasi-greedy procedure that maximises, at each iteration, the overlap of the current iterate with the target. This is achieved by adding on-the-fly, the most relevant unitary operator from a finite size pool of admissible operators, with a selection criterion based on the gradient of the overlap of the ansatz with the target. I will also detail how the approach can be used for state preparation purpose and shows a first implementaion on a real quantum processing unit. Finally, I will present some initial results obtained with our in-house GPU-accelerated quantum emulator and explain how one can use it through a direct coupling with a quantum computer to perform full adaptive-VQE simulations.

  • Overlap-ADAPT-VQE: Practical Quantum Chemistry on Quantum Computers via Overlap-Guided Compact Ansätze. C. Feniou, M. Hassan, D. Traoré, E. Giner, Y. Maday, J.-P. Piquemal, Commun. Phys., 2023, 6, 192 (Open Access), DOI: 10.1038/s42005-023-01312-y
  • Sparse Quantum State Preparation for Strongly Correlated Systems. C. Feniou, B. Claudon, J. Zylberman, O. Adjoua, E. Giner, J.-P. Piquemal, 2023, DOI: 10.48550/arXiv.2311.03347
  • Greedy Gradient-free Adaptive Variational Quantum Algorithms on a Noisy Intermediate Scale Quantum Computer.C. Feniou, B. Claudon, M. Hassan, A. Courtat, O. Adjoua, Y. Maday, J.-P. Piquemal, 2023, DOI: 10.48550/arXiv.2306.17159

14:45-15:15: Coffee break


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