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[Lecture] Nishimori's cat in a noisy quantum processor
Sep. 14, 2023

Speaker: Guo-Vi Zhu (University of Cologne)

Time: 16:00-17:00 p.m., September 14, 2023, GMT+8

Venue: Zoom ID: 963 5796 8034 Password: 125125


Traditionally, measurements have been synonymous with extracting information from physical systems. Yet in the quantum realm, the extraordinary nature of measurements allows them to actively modify and steer quantum states, forging a new route to entanglement has remained an open question whether these measurement-based state preparation protocols can lead to phases ofmatter which are stable to gate imperfections. In this talk I will focus on a shallow circuit targeting at the “hydrogen atom” of long-range entangled states - the Greenberger-Horne-Zeilinger state. We analytically find that its long range order is stable against certain coherent and incoherent errors, up to a finite threshold. The threshold is governed by a hidden Nishimori criticality, featuring a conspiracy of disorder and effective temperature enforced by the Born's rule. Illdiscuss our latest experimental implementation on an IBM 127-qubit quantum processor.

Source: School of Physics