Simulating IBM's Kicked Ising Experiment with Quantum-Inspired Tensor Networks NoviembreNov 16 2023 00:00 - 00:00 UTC


Román Orús, PhD
Cofounder and Chief Scientific Officer, Multiverse Computing
Ikerbasque Research Professor, Donostia International Physics Center (DIPC)


We show how quantum-inspired 2d tensor networks can be used to efficiently and accurately simulate the largest quantum processors from IBM, namely Eagle (127 qubits), Osprey (433 qubits) and Condor (1121 qubits). We simulate the dynamics of a complex quantum many-body system -- specifically, the kicked Ising experiment considered recently by IBM in Nature 618, p. 500-505 (2023) -- using graph-based Projected Entangled Pair States (gPEPS) [PRB 99, 195105 (2019)]. Our results show that simple tensor updates are already sufficient to achieve very large unprecedented accuracy with remarkably low computational resources for this model. Apart from simulating the original experiment for 127 qubits, we also extend our results to 433 and 1121 qubits, and for evolution times around 8 times longer, thus setting a benchmark for the newest quantum processors. We also report accurate simulations for infinitely-many qubits. We discuss also on the implications of these results.


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