Deep neural networks as variational solutions for correlated open quantum systems

Johannes Mellak*, Enrico Arrigoni, Wolfgang von der Linden

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this work we apply deep neural networks to find the non-equilibrium steady state solution to correlated open quantum many-body systems. Motivated by the ongoing search to find more powerful representations of (mixed) quantum states, we design a simple prototypical convolutional neural network and show that parametrizing the density matrix directly with more powerful models can yield better variational ansatz functions and improve upon results reached by neural density operator based on the restricted Boltzmann machine. Hereby we give up the explicit restriction to positive semi-definite density matrices. However, this is fulfilled again to good approximation by optimizing the parameters. The great advantage of this approach is that it opens up the possibility of exploring more complex network architectures that can be tailored to specific physical properties. We show how translation invariance can be enforced effortlessly and reach better results with fewer parameters. We present results for the dissipative one-dimensional transverse-field Ising model and a two-dimensional dissipative Heisenberg model compared to exact values.

Original languageEnglish
Article number268
JournalCommunications Physics
Volume7
Issue number1
DOIs
Publication statusPublished - Dec 2024

ASJC Scopus subject areas

  • General Physics and Astronomy

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