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SUMMARY:Simulating spin systems with dissipative-coupled lasers - Professo
 r Nir Davidson\, Weizmann Institute of Science\, Rehovot\, Israel
DTSTART:20161017T130000Z
DTEND:20161017T140000Z
UID:TALK68625@talks.cam.ac.uk
CONTACT:Prof Natalia Berloff
DESCRIPTION:Besides their potential for high brightness sources\, coupled
  laser networks reveal intriguing physics. First\, very large arrays of >1
 000 lasers with nearest-neighbor coupling are shown to rapidly “dissipat
 e” into long-range phase ordering\, identical to the ground state of a c
 orresponding XY spin Hamiltonian.  For negative coupling "anti-ferromagnet
 ic" phase order is observed\, which reveals "geometric frustration" in a K
 agome lattice  and odd-numbered rings. Second\, arrays of coupled lasers w
 ith fluctuating lengths reveal phase and power fluctuations that agree wit
 h extreme value distributions of random matrices. Thirdly\, long range di
 ssipative coupling is used for real-time wave-front shaping through scatte
 ring media\, for controlling spatial coherence\, and for observing “quan
 tum” phase transitions for spin-like systems with quenched disorder. Fou
 rthly\, complex laser networks with homogenous time delayed coupling are s
 hown to divide into phase-synchronized or chaos-synchronized clusters wher
 e the number of clusters is the greatest common divider of the number of l
 asers in simply connected loops. Finally\, complex light fields stored in 
 warm atomic media are shown to reveal identical dissipative dynamics into 
 a ground state of a corresponding continuous Hamiltonian. \n 
LOCATION:MR4
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