ELFT HÍRADÓ

[Dr.Pályi András <palyi.andras AT ttk.bme.hu>]

Dear Colleagues,

This is to advertise the following talk of Izabella Lovas on "Quantum phases 
of matter under non-unitary dynamics”.

Time: Jan 27, Monday, 14:15
Location: seminar room of the Department of Theoretical Physics, BME F 
building, stairway III, ground floor. 

Izabella LOVAS (ETH Zurich)
Quantum phases of matter under non-unitary dynamics

Abstract: "Recent breakthroughs in the development of digital quantum devices 
promise to grant computational capacities far beyond the reach of classical 
architectures, and open unprecedented possibilities to study quantum 
many-body systems. This swift progress is fueling intense interest in the 
complex interplay of unitary quantum dynamics and non-unitary processes 
arising naturally in experiments, such as dissipation stemming from coupling 
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 challenges of 
protecting quantum coherence against environmental noise, and explore the 
dynamical phase diagram of dissipative quantum many-body systems. In contrast 
to the general expectation that in an open system coherent information is 
quickly lost to the dissipative environment, we construct a regime of open 
quantum dynamics, functioning as a quantum error-correcting code which is 
dynamically protected against generic boundary noise. We comment on the 
implications of these results for designing robust quantum devices. We then 
turn to the effects of local measurements performed on the system. 
Specifically, we demonstrate that appropriately chosen projective 
measurements can imprint highly non-trivial order on quantum many-body 
systems, realizing the out-of-equilibrium counterpart of spontaneous symmetry 
breaking and symmetry protected topological order.”

Guests are welcome.

Best regards,
Andras Palyi