|Title||Mixed-state entanglement as a probe of topological order, quantum phase transitions and quasiparticles|
|Speaker||Tarun Grover (UC San Diego)|
📅 June 22
🕓 5.00 PM Rome
Quantum entanglement of pure states has led to new insights into a wide variety of topics. Entanglement of mixed states is however less well understood. In this talk I will focus on a few themes where mixed-state entanglement leads to new insights that are difficult to obtain otherwise. I will mainly focus on two topics: (i) Characterizing finite-temperature topological order  and classicality/quantum-ness of phase transitions  (ii) Detecting presence of quasiparticles and quantum chaos .
Work done in collaboration with Tsung-Cheng Lu, Tim Hsieh, Kai-Hsin Wu, Chia-Min Chung and Ying-Jer Kao.
 Phys. Rev. Lett. 125, 116801 (2020).
|🔗 Past seminars|
|Title||Adiabatic eigenstate deformations: A probe for quantum chaos|
|Speaker||Rajat Kumar Panda|
📅 July 8
|Abstract||Quantum chaos is essential for the emergence of statistical mechanics and thermodynamics. It manifests itself in the effective description of the eigenstates of chaotic Hamiltonians through random matrix ensembles and the eigenstate thermalization hypothesis. Standard measures of chaos in quantum many-body systems are level statistics and the spectral form factor. In this seminar, following the paper [PhysRevX.10.041017], we will see how the norm of the adiabatic gauge potential, the generator of adiabatic deformations between eigenstates, serves as a measure of quantum chaos. Using two generic classes of spin chains, I will compare the sensitivity of different probing methods.|
|🔗 Past journal club meetings|