Quantum optics and quantum information processing in circuit quantum electrodynamics Florian Marquardt Ludwig-Maximilians University Munich (Center for NanoScience and Arnold Sommerfeld Center for Theoretical Physics) SFB 631
Circuit QED Qubit/Artificial atom: Cooper pair box Nakamura et al. 1998 Schoelkopf lab 2004 fully tunable two-level system: Josephson charging energy tunnel coupling
Circuit QED - reminder Coupling to a microwave resonator mode superconducting transmission line Cooper-pair box microwave resonator Blais et al., PRA 2004 (original proposal); Wallraff et al., Nature 2004 (first implementation) resonator coupling qubit mode 1-10 GHz 10-100 MHz
Circuit QED Coupling to a microwave resonator mode superconducting Cooper-pair box transmission line microwave resonator Blais et al., PRA 2004 (original proposal); Wallraff et al., Nature 2004 (first implementation) resonator coupling qubit mode 1-10 GHz 10-100 MHz
Vacuum Rabi splitting
Circuit QED - experimental achievements • strong coupling: spectroscopy, Rabi oscillations • dispersive qubit readout • Ramsey experiments: T1,T2 • Single photon generation • Photon number splitting • Two-qubit gates via cavity Yale : Schoelkopf lab since 2004 Delft : Mooij lab 2004 (Wallraff, Schuster, Houck, (Chiorescu, ...) Majer, ...), Devoret lab NIST : Simmonds lab since 2007 NTT : Johansson, Saito, Semba, (Sillanpäa, ...) Takayanagi et al. 2006
Dispersive 2-qubit gate: Yale setup setup Two-qubit gate Two ! qubit gate: iSWAP spectroscopy Majer et al., Nature 449, 443 (2007) (Yale, Schoelkopf lab) 2 J [see also NIST group: resonant 2-qubit gate 2 π via cavity Sillanpää, Park, Simmonds Nature 2007]
The cavity grid design Helmer, Mariantoni, Fowler, von Delft, Solano, Marquardt, Europhysics Letters 2009
The cavity grid design Helmer, Mariantoni, Fowler, von Delft, Solano, Marquardt, Europhysics Letters 2009
The cavity grid design Helmer, Mariantoni, Fowler, von Delft, Solano, Marquardt, Europhysics Letters 2009
The cavity grid design Helmer, Mariantoni, Fowler, von Delft, Solano, Marquardt, Europhysics Letters 2009
The cavity grid design 1 2 Helmer, Mariantoni, Fowler, von Delft, Solano, Marquardt, Europhysics Letters 2009
The cavity grid design 1 2 3 Helmer, Mariantoni, Fowler, von Delft, Solano, Marquardt, Europhysics Letters 2009
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