Quantum optics and quantum information processing in circuit - - PowerPoint PPT Presentation

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Jan 17, 2024 341 likes •484 views

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

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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

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Circuit QED Qubit/Artificial atom: Cooper pair box Josephson tunnel coupling charging energy fully tunable two-level system:

Nakamura et al. 1998 Schoelkopf lab 2004

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Circuit QED - reminder Coupling to a microwave resonator mode

Blais et al., PRA 2004 (original proposal); Wallraff et al., Nature 2004 (first implementation)

superconducting transmission line microwave resonator Cooper-pair box

qubit resonator mode coupling 1-10 GHz 10-100 MHz

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Circuit QED Coupling to a microwave resonator mode

Blais et al., PRA 2004 (original proposal); Wallraff et al., Nature 2004 (first implementation)

superconducting transmission line microwave resonator Cooper-pair box

qubit resonator mode coupling 1-10 GHz 10-100 MHz

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Vacuum Rabi splitting

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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 (Wallraff, Schuster, Houck, Majer, ...), Devoret lab Delft: Mooij lab 2004 (Chiorescu, ...) NIST: Simmonds lab since 2007 (Sillanpäa, ...) NTT: Johansson, Saito, Semba, Takayanagi et al. 2006

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Dispersive 2-qubit gate: Yale setup

2J 2π

Majer et al., Nature 449, 443 (2007) (Yale, Schoelkopf lab)

Two!qubit gate: iSWAP

setup spectroscopy