Title: Orthogonality Catastrophe as a Consequence of the Quantum Speed Limit
Speaker: Dr. Steve Campbell (UCD)
Abstract: A remarkable feature of quantum many-body systems is the orthogonality catastrophe which describes their extensively growing sensitivity to local perturbations and plays an important role in condensed matter physics. In this talk we will see that the dynamics of the orthogonality catastrophe can be understood as a direct consequence of the energy-time uncertainty relation, and as such can be fully characterized by the quantum speed limit. More specifically, we will see that any quantum many-body system whose energy scales with the number of particles exhibits the orthogonality catastrophe. Our rigorous findings are demonstrated by two paradigmatic classes of many-body systems – the trapped Fermi gas and the long-range interacting Lipkin-Meshkov-Glick spin model.
Time: Thursday, 28th November 2019, 2.30pm
Location: Lecture Room, School of Theoretical Physics, DIAS,
10 Burlington Road, Dublin 4
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Posted: 21st November 2019 by Kevin Kavanagh
Thursday 28th November: Orthogonality Catastrophe as a Consequence of the Quantum Speed Limit
Title: Orthogonality Catastrophe as a Consequence of the Quantum Speed Limit
Speaker: Dr. Steve Campbell (UCD)
Abstract: A remarkable feature of quantum many-body systems is the orthogonality catastrophe which describes their extensively growing sensitivity to local perturbations and plays an important role in condensed matter physics. In this talk we will see that the dynamics of the orthogonality catastrophe can be understood as a direct consequence of the energy-time uncertainty relation, and as such can be fully characterized by the quantum speed limit. More specifically, we will see that any quantum many-body system whose energy scales with the number of particles exhibits the orthogonality catastrophe. Our rigorous findings are demonstrated by two paradigmatic classes of many-body systems – the trapped Fermi gas and the long-range interacting Lipkin-Meshkov-Glick spin model.
Time: Thursday, 28th November 2019, 2.30pm
Location: Lecture Room, School of Theoretical Physics, DIAS,
10 Burlington Road, Dublin 4
Category: Regular seminars, School of Theoretical Physics News & Events
The Theroretical Physics theme for the 80th anniversary is "Quantum, Inifinity and Beyond" The events will tie in the main research topics of the School and draw on its rich history. More on DIAS 2020 can be found here: dias.ie/dias2020/
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@petertgallagher will be on @PatKennyNT at 11.20 talking about the @esa #SolarOrbiter launch that took place at 4.03 yesterday morning from Cape Canaveral. ☀️🛰️ Listen now: newstalk.com #DIASdiscovers
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Tickets still available for our Statutory Public Lecture this evening by @hfalcke: “The First Image of a Black Hole” More here➡️eventbrite.ie/e/dias-scp-sta… Tickets are free! #DIASdiscovers #blackhole