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SUMMARY:Quantum circuit as a lens into quantum phases and phase transition
 s - Prof. Xie Chen (Caltech)
DTSTART:20260217T190000Z
DTEND:20260217T200000Z
UID:TALK241423@talks.cam.ac.uk
CONTACT:Ruize Li
DESCRIPTION:Quantum systems host fascinating phases like superconductivity
 \, quantum Hall\, topological order\, etc that have no classical counterpa
 rt. Understanding what quantum phases exist and how phase transitions happ
 en between them is the ultimate goal of condensed matter. But this is noto
 riously hard\, especially in systems with strong interactions. We find tha
 t the Quantum Circuit\, a tool in quantum computation\, provides surprisin
 gly useful insight into the many-body entanglement structure of quantum wa
 vefunctions and correspondingly the structure of the quantum phase diagram
 . In this talk\, we start by reviewing how a decade ago defining gapped qu
 antum phases using finite-depth quantum circuits led us to the systematic 
 construction and classification of Symmetry Protected Topological Phases. 
 Recently\, we took another step forward by realizing that the transition b
 etween different gapped phases can be achieved with sequential quantum cir
 cuits. This opens the door to the systematic study of defects in quantum s
 ystems\, their condensation\, and the induced phase transitions in strongl
 y interacting systems. 
LOCATION:Wolfson Lecture Theatre Yusuf Hamied Department of Chemistry
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