ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarVukics AndrásWigner RCP SZFIFinite-size scaling and thermodynamic 
limit of a first-order dissipative phase transition in zero dimensionTuesday, 
29 March 2022, 10:00, Bldg 1, auditorium, 
https://wigner-hu.zoom.us/j/92964941243?pwd=TU9rTi8xRHRBMTBUbXUwUzZNVExydz09  
 Meeting ID: 929 6494 1243  Passcode: 955720I present our studies over the 
last several years related to the photon-blockade breakdown (PBB) effect, 
occurring most simply in a coupled system of a bosonic mode and a two-level 
system. Having been identified as a first-order dissipative phase transition 
in a thermodynamic limit where the coupling between the subsystems goes to 
infinity without affecting the system size [1] (hence the designation 
zero-dimensional), PBB was studied in a finite-size scaling approach [2], 
with finite-size scaling exponents determined numerically. I describe the 
experimental studies where we participated from the theoretical/computational 
side. PBB was first observed in a circuit QED platform [3], and the 
thermodynamic limit can also be modeled with artificial superconducting atoms 
[4]. I present our computational technology – involving on the software side 
quantum-trajectory simulations implemented in a high-level C++ framework [5], 
and on the hardware side a virtual cluster in an OpenStack cloud environment 
(ELKH cloud).[1] H. J. Carmichael, Phys. Rev. X 5, 031028 (2015).[2] A. 
Vukics, A. Dombi, J. M. Fink, P. Domokos, Quantum 3, 150 (2019).[3] J. M. 
Fink, A. Dombi, A. Vukics, A. Wallraff, and P. Domokos, Phys. Rev. X 7, 
011012 (2017).[4] R. Sett, F. Hassani, D. Phan, Sh. Barzanjeh, A. Vukics, and 
J. M. Fink, in preparation.[5] A. Vukics, Comp. Phys. Comm. 183, 1381-1396 
(2012). https://github.com/vukics/cppqed Minden érdeklődőt szívesen 
látunk! - Everyone is welcome to attend.Róbert Juhászsem-admin AT szfki.hu