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

Abstract:

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 generation.lt 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