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Quantum Criticality Using a Superconducting Quantum Processor

Maxime Dupont, Joel E. Moore

6 pages (3 figures) + 12 pages (12 figures)
License: not stated (all rights reserved)

Abstract: Quantum criticality emerges from the collective behavior of many interacting quantum particles, often at the transition between different phases of matter. It is one of the cornerstones of condensed matter physics, which we access on noisy intermediate-scale (NISQ) quantum devices by leveraging a dynamically-driven phenomenon. We probe the critical properties of the one-dimensional quantum Ising model on a programmable superconducting quantum chip via a Kibble-Zurek process, obtain scaling laws, and estimate critical exponents despite inherent sources of errors on the hardware. A one-parameter noise model captures the effect of imperfections and reproduces the experimental data. Its systematic study reveals that the noise, analogously to temperature, induces a new length scale in the system. We introduce and successfully verify modified scaling laws, directly accounting for the noise without any prior knowledge, enhancing the power of NISQ processors considerably for addressing quantum criticality and potentially other phenomena and algorithms.

Submitted to arXiv on 22 Sep. 2021