| Date and time | 17:00-18:00, Wednesday 27 September, 2023 (JST) |
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| Speaker | Dr. Guoyi Zhu, University of Cologne, Germany |
| Registration | Visit here |
| Title | Nishimori's cat in a noisy quantum processor |
| 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. It has remained an open question whether these measurement-based state preparation protocols can lead to phases of matter 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. I will discuss our latest experimental implementation on an IBM 127-qubit quantum processor. |
| References | https://arxiv.org/abs/2309.02863, https://arxiv.org/abs/2208.11136 |
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