aspuru-list September 2018

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[Aspuru-Guzik Group List] ITAMP lunch seminar - Jamir Marino, Harvard University (September 6th)

by Zhu, Bihui

*ITAMP Lunch Seminar* *Speaker: *Jamir Marino (Harvard University) *Date:* Thursday, September 6th *Time:* 12:00-1:00 pm Includes Pizza. *Title: *Orthogonality catastrophe in gapless dissipative quantum many body systems *Abstract: *I will present an analog of the phenomenon of orthogonality catastrophe in quantum many body systems subject to a local dissipative impurity. I will show that the fidelity displays an exponential decay at a rate which signals the onset of environmental decoherence, accompanied by a critical algebraic slow down induced by the presence of gapless modes in the system. This picture is substantiated, in a second order cumulant expansion, for the one-dimensional integrable quantum spin chains subject to a local dephasing jump operator, as well as for the two dimensional Bose gas deep in the superfluid phase with local particle heating. I will also discuss ideal set-ups for the measurement of this effect as well as possible ways to extend calculations beyond perturbation theory. *Location: *B-106 @ Center for Astrophysics (60 Garden Street <https://maps.google.com/?q=60+Garden+Street&entry=gmail&source=g>) *Directions: *After entering the lobby of the CfA, turn right to enter the hallway of the B building. In the hallway, turn right again, B-106 will be at the end of the hallway on the left side.

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aspuru-list September 2018