Related papers: Variational waveguide QED simulators

Variational waveguide QED simulators

URL: http://arxiv.org/abs/2302.01922v1
Date: Fri, 3 Feb 2023 18:55:08 GMT
Title: Variational waveguide QED simulators
Authors: Cristian Tabares, Alberto Mu\~noz de las Heras, Luca Tagliacozzo, Diego Porras, Alejandro Gonz\'alez-Tudela
Abstract summary: Waveguide QED simulators are made by quantum emitters interacting with one-dimensional photonic band-gap materials. Here, we demonstrate how these interactions can be a resource to develop more efficient variational quantum algorithms.
Score: 58.720142291102135
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Waveguide QED simulators are analogue quantum simulators made by quantum emitters interacting with one-dimensional photonic band-gap materials. One of their remarkable features is that they can be used to engineer tunable-range emitter interactions. Here, we demonstrate how these interactions can be a resource to develop more efficient variational quantum algorithms for certain problems. In particular, we illustrate their power in creating wavefunction ans\"atze that capture accurately the ground state of quantum critical spin models (XXZ and Ising) with less gates and optimization parameters than other variational ans\"atze based on nearest-neighbor or infinite-range entangling gates. Finally, we study the potential advantages of these waveguide ans\"atze in the presence of noise. Overall, these results evidence the potential of using the interaction range as a variational parameter and place waveguide QED simulators as a promising platform for variational quantum algorithms.

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