



@article {3368,
	title = {Quantum computation of dynamical quantum phase transitions and entanglement tomography in a lattice gauge theory},
	year = {2023},
	month = {10/6/2023},
	abstract = {<p>Strongly-coupled gauge theories far from equilibrium may exhibit unique features that could illuminate the physics of the early universe and of hadron and ion colliders. Studying real-time phenomena has proven challenging with classical-simulation methods, but is a natural application of quantum simulation. To demonstrate this prospect, we quantum compute non-equal time correlation functions and perform entanglement tomography of non-equilibrium states of a simple lattice gauge theory, the Schwinger model, using a trapped-ion quantum computer by IonQ Inc. As an ideal target for near-term devices, a recently-predicted [Zache et al., Phys. Rev. Lett. 122, 050403 (2019)] dynamical quantum phase transition in this model is studied by preparing, quenching, and tracking the subsequent non-equilibrium dynamics in three ways: i) overlap echos signaling dynamical transitions, ii) non-equal time correlation functions with an underlying topological nature, and iii) the entanglement structure of non-equilibrium states, including entanglement Hamiltonians. These results constitute the first observation of a dynamical quantum phase transition in a lattice gauge theory on a quantum computer, and are a first step toward investigating topological phenomena in nuclear and high-energy physics using quantum technologies.</p>},
	url = {https://arxiv.org/abs/2210.03089},
	author = {Niklas Mueller and Joseph Carolan and Andrew Connelly and Zohreh Davoudi and Eugene F. Dumitrescu and K{\"u}bra Yeter-Aydeniz}
}
