ELFT HÍRADÓ

[tcsaba <tcsaba AT eik.bme.hu>]

                 M E G H Í V Ó - I N V I T A T I O N

    Seminar Series of the Department of Theoretical Physics at the
           Budapest University of Technology and Economics


                         Péter Domokos
             (Wigner Research Center for Physics)


   Observation of the Photon-Blockade Breakdown Phase Transition

Nonequilibrium phase transitions exist in damped-driven open quantum 
systems when the continuous tuning of an external parameter leads to a 
transition between two robust steady states. In second-order transitions 
this change is abrupt at a critical point, whereas in first-order 
transitions the two phases can coexist in a critical hysteresis domain. 
We report the observation of a first-order dissipative quantum phase 
transition in a driven circuit quantum electrodynamics system. It takes 
place when the photon blockade of the driven cavity-atom system is 
broken by increasing the drive power. The observed experimental 
signature is a bimodal phase space distribution with varying weights 
controlled by the drive strength. Our measurements show an improved 
stabilization of the classical attractors up to the millisecond range 
when the size of the quantum system is increased from one to three 
artificial atoms.


Időpont: 2018. május 11. péntek, 10:15
Helyszín: BME Fizikai Intézet, Elméleti Fizika Tanszék,
Budafoki út 8. F-épület, III lépcsőház, szemináriumi szoba