Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 12: Poster I
QI 12.1: Poster
Tuesday, March 19, 2024, 11:00–14:30, Poster B
Entanglement informed construction of variational quantum circuits in the context of circuit cutting — •Alina Joch1,2 and Benedikt Fauseweh1,2 — 1DLR, Cologne, Germany — 2TU Dortmund, Dortmund, Germany
Circuit cutting is a method to divide a quantum circuit into smaller parts and solve these parts separately. The method is only reasonable for few cuts due to the exponential overhead in classical information exchange between the different parts. We look at two spin chain models, both with an additional impurity at the central spin of the chain, forming an entanglement barrier. We then benchmark the accuracy of the ground state energy of these models obtained by a variational quantum eigensolver with finite-depth quantum circuit with varying number of entanglement gates with the central spin. After a certain number of layers, plateaus are formed whose values only depend on the absolute number of entanglement gates with the central spin. We analyze the dependence of the achieved accuracy on the number and localization of entangling gates. We identify model parameters in which a low number of entangling gates is sufficient to achieve high accuracy, allowing for efficient circuit cutting.
Keywords: Quantum Simulation; Variational Quantum Eigensolver; Condensed Matter Systems; Entanglement; Circuit Cutting