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SUMMARY:Quantum phases of matter under non-unitary dynamics - Izabella Lov
 as\, ETH Zurich
DTSTART:20250213T140000Z
DTEND:20250213T150000Z
UID:TALK225550@talks.cam.ac.uk
CONTACT:Gaurav
DESCRIPTION:Recent breakthroughs in the development of digital quantum dev
 ices promise to grant computational capacities far beyond the reach of cla
 ssical architectures\, and open unprecedented possibilities to study quant
 um many-body systems. This swift progress is fueling intense interest in t
 he complex interplay of unitary quantum dynamics and non-unitary processes
  arising naturally in experiments\, such as dissipation stemming from coup
 ling to the environment or projective measurements performed on the system
 . This talk illustrates the rich dynamical phase diagrams that can emerge 
 in these non-unitary settings. In the first part\, we address the challeng
 es of protecting quantum coherence against environmental noise\, and explo
 re the dynamical phase diagram of dissipative quantum many-body systems. I
 n contrast to the general expectation that in an open system coherent info
 rmation is quickly lost to the dissipative environment\, we construct a re
 gime of open quantum dynamics\, functioning as a quantum error-correcting 
 code which is dynamically protected against generic boundary noise. We com
 ment on the implications of these results for designing robust quantum dev
 ices. We then turn to the effects of local measurements performed on the s
 ystem. Specifically\, we demonstrate that appropriately chosen projective 
 measurements can imprint highly non-trivial order on quantum many-body sys
 tems\, realizing the out-of-equilibrium counterpart of spontaneous symmetr
 y breaking and symmetry protected topological order.
LOCATION:TCM Seminar Room
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