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10-15
2026
Every layer counts: Worst-case depth hierarchy for shallow quantum circuits
时 间：14:30-16:30, Oct 15, 2026 (Thu)地 点：RM S527, MMW Building内容：Circuit depth is a fundamental proxy for computational time. As has long been studied in the classical field, a similar question central in quantum complexity is: Does each additional layer of gates really increase computational power? We answer this question in the affirmative within the quantum complexity class $\math...
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10-09
2026
High-rate qLDPC processors
时 间：11:00-12:00, Oct 9, 2026 (Fri)地 点：RM S527, MMW Building or Venue: https://caltech.zoom.us/j/87834027070 (password: BB1984)内容：Despite significant progress on quantum low-density parity-check (qLDPC) codes, building qLDPC processors that are high-rate, high-throughput, hardware-friendly, and fast-to-decode remains a challenge. In this work, we introduce mitten codes, a family of ...
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09-24
2026
Quantum Computing and Quantum Advantage
时 间：11:00-12:00, Sep 24, 2026 (Thu)地 点：RM 1-202, FIT Building内容：Quantum computers have the potential to solve problems that are intractable for classical computers. However, building a universal, fault-tolerant quantum computer remains a significant technological challenge. Before fully fledged quantum computers become available, a more immediate question is what can be achieved wi...
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09-09
2026
State retrieval beyond Bayes’ retrodiction and reverse processes
时 间：15:00-17:00, Sep 9, 2026 (Wed)地 点：MMW-727会议室 (腾讯会议： 422-776-136)内容：In the context of irreversible dynamics, the meaning of the reverse of a physical evolution can be quite ambiguous. It is a standard choice to define the reverse process using Bayes' theorem, but, in general, this is not optimal with respect to the relative entropy of recovery. In this work we explore wh...
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08-25
2026
Detecting quantum resources in mixed states
时 间：11:00-12:00, Aug 13, 2026 (Thu)地 点：RM S527, MMW Building内容：Detecting quantum resources, especially in mixed quantum states, is a highly challenging task. Starting from the widely-used concept of resource witnesses, we propose a framework that systematically generate analytical and experimentally accessible criteria based on a single witness and a group of free unitaries.Our co...
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08-21
2026
Global Dualities in Quantum Integrable Systems and Markov Processes
时 间：11:00-12:00, Aug 21, 2026 (Fri)地 点：腾讯会议：188-585-149（会议链接：https://meeting.tencent.com/dm/ueSfCeE8ENCB）内容：Duality transformations reveal unexpected equivalences between seemingly distinct models. We introduce a concept of global duality, in which a duality operator intertwines two one-dimensional local Hamiltonians via generalised exchange relations, in contrast to lo...