Theoretical Physics

15 December 2015
Time: 15:00 to 16:00
Location: EC Stoner 8.60

Theoretical Physics Seminar: Juan Jose Garcia Ripoll (Instituto de Física Fundamental)

Tuesday, 15/12 @ EC Stoner 8.60 3pm

Superconducting Circuit Microwave Photonics
Juan Jose Garcia Ripoll
Instituto de Física Fundamental
Quantum circuits represent a unique platform for studying new regimes of
light-matter interaction. An excellent impedance match between photonic
degrees of freedom and artificial atoms (superconducting qubits) allows
reaching very strong couplings [1], while preserving broadband
tunability. Inspired by these possibilities, and supported by numerical
tools based on Matrix Product States, we are studying the Ohmic
spin-boson model [2], focusing not only on the dissipative dynamics of
qubits, but also on their effects on the photonic field, few photon
scattering and strongly correlated phenomena [3]. I will report on such
results, including additional theoretical efforts [4] to model these
strongly interacting light-matter systems at low dimensions. Finally, I
will connect our results with ongoing experimental work of our
collaborators at the group of Prof. R. Gross (WMI, Garching)
[1] Circuit quantum electrodynamics in the ultrastrong-coupling regime.
T. Niemczyk et al, Nat. Phys. 6, 772-776 (2010)
[2] Nonequilibrium and nonperturbative dynamics of ultrastrong coupling
in open lines, B. Peropadre, D. Zueco, D. Porras, J. J. GarciaRipoll,
Phys. Rev. Lett. 111, 243602 (2013)
[3] Hybrid quantum magnetism in circuit-QED: from spin-photon waves to
many-body spectroscopy. A. Kurcz, A. Bermudez, J. J. García-Ripoll,
Phys. Rev. Lett. 112, 180405 (2014)
[4] Photon-mediated qubit interactions in 1D discrete and continous
models, G. Diaz-Camacho, D. Porras, J. J. Garcia-Ripoll, accepted
in PRA



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