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SUMMARY:Quantum Computational Physics - Simon Trebst (Cologne)
DTSTART:20250507T151500Z
DTEND:20250507T161500Z
UID:TALK228745@talks.cam.ac.uk
CONTACT:Lucas Sá
DESCRIPTION:Computational physics —the third pillar of physics explorati
 on next to theory and experiment — has\, for the past seven decades\, ev
 olved alongside tremendous progress in computing hardware. Today the field
  is on the verge of leaving behind classical computing resources\, and piv
 oting towards quantum hardware\, allowing for “quantum on quantum” sim
 ulations. In this talk will discuss the "assembler-level" of such quantum 
 computing\, asking what kind of quantum many-body phenomena one can induce
  in digital quantum circuits that employ not only the conventional set of 
 unitary gates\, but also mid-circuit measurements and active feedback. In 
 essence\, such quantum circuits allow for the dynamical creation\, manipul
 ation and decoding of collective entanglement structures. \n\n\n\nAs an ex
 ample\, I will discuss novel types of quantum criticality that can arise f
 rom shallow quantum circuits and which are generally described by (2+0)-di
 mensional non-unitary conformal field theories. Nishimori universality has
  emerged as a seemingly ubiquitous fixed point for such critical theories\
 , which we discuss for mixed-state transitions arising from weak measureme
 nt or incoherent noise (or both). Putting Nishimori physics in competition
  to other critical theories\, such as percolation\, self-dual (Kramers-Wan
 nier) quantum criticality or a novel tricritical theory at the intersectio
 n of phases with strong\, weak or broken Z_2 symmetry\, RG flows between t
 hese critical theories can be established and embedded in rich phase diagr
 ams — some of which we have numerically explored on IBM’s 127-qubit qu
 antum processors.
LOCATION:Lecture Teatre\, Ray Dolby Centre
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