Circuit Quantum Electrodynamics

Two Transmon Resonator (Logo)

We have built an integrated circuit in which a superconducting “qubit,” or artificial atom, is coupled to a single microwave photon trapped in a superconducting transmission line “cavity.” It has direct analogies with the field of cavity quantum electrodynamics (cavity QED) in quantum optics.

Cavity Bus Frequently Asked Questions (html, doc, pdf)

Single Photon Frequently Asked Questions (html)

A layman's guide to Circuit Quantum Electrodynamics (html, doc, pdf)

cQED Frequently Asked Questions (html, doc, pdf)

Publications:

  • Randomized benchmarking and process tomography for gate errors in a solid-state qubit
    J. M. Chow, J. M. Gambetta, L. Tornberg, Jens Koch, Lev S. Bishop, A. A. Houck, B. R. Johnson, L. Frunzio, S. M. Girvin, and R. J. Schoelkopf. Phys. Rev. Lett. 102, 090502 (2009), doi:10.1103/PhysRevLett.102.090502. (cond-mat/0811.4387)
  • Nonlinear response of the vacuum Rabi resonance
    Lev S. Bishop, J. M. Chow, Jens Koch, A. A. Houck, M. H. Devoret, E. Thuneberg, S. M. Girvin, and R. J. Schoelkopf. Nature Physics 5, 105 - 109 (2009). doi:10.1038/nphys1154. (cond-mat/0807.2882, supplement pdf, movie 1, movie 2)
  • Charge Insensitive Qubit Design from Optimizing the Cooper-Pair Box
    Jens Koch, T.M. Yu, J.M. Gambetta, A.A. Houck, D.I Schuster, J. Majer, A. Blais, M.H. Devoret, S.M. Girvin, and R.J. Schoelkopf. Phys. Rev. A 76, 042319 (2007), doi:10.1103/PhysRevA.76.042319. (cond-mat/0703002)
  • Coupling superconducting qubits via a cavity bus
    J. Majer, J. M. Chow, J. M. Gambetta, Jens Koch, B. R. Johnson, J. A. Schreier, L. Frunzio, D. I. Schuster, A. A. Houck, A. Wallraff, A. Blais, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf. Nature (London) 449 443 (2007), doi:10.1038/nature06184 (cond-mat/0709.2135)
  • Generating single microwave photons in a circuit
    A. A. Houck, D. I. Schuster, J. M. Gambetta, J. A. Schreier, B. R. Johnson, J. M. Chow, L. Frunzio, J. Majer, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf. Nature (London) 449 328 (2007), doi:10.1038/nature06126 (cond-mat/0702648)
  • Sideband Transitions and Two-Tone Spectroscopy of a Superconducting Qubit Strongly Coupled to an On-Chip Cavity A. Wallraff, D.I. Schuster, A. Blais, J.M. Gambetta, J. Schreier, A. Houck, L. Frunzio, M.H. Devoret, S.M. Girvin, and R.J. Schoelkopf. Phys Rev Lett 99, 050501 (2007), doi:10.1103/PhysRevLett.99.050501 (cond-mat/0703632)
  • Protocols for Optimal Readout of Qubits Using a Continuous Quantum Nondemolition Measurement J. Gambetta, W.A. Braff, A. Wallraff, S.M. Girvin, and R.J. Schoelkopf. Phys Rev A 76, 012325 (2007), doi:10.1103/PhysRevA.76.012325 (cond-mat/0701078)
  • Quantum Information Processing with Circuit Quantum Electrodynamics A. Blais, J. Gambetta, A. Wallraff, D.I. Schuster, S.M. Girvin, M.H. Devoret, and R.J. Schoelkopf. Phys Rev A 75, 032329 (2007), doi:10.1103/PhysRevA.75.032329 (cond-mat/0612038)
  • Resolving photon number states in a superconducting circuit.
    D. I. Schuster, A. A. Houck, J. A. Schreier, A. Wallraff1, J. M. Gambetta, A. Blais1, L. Frunzio, J. Majer, B. R. Johnson, M. H. Devoret, S. M. Girvin, and R. J. Schoelkopf. Nature (London) 445 515 (2007), doi:10.1038/nature05461 (preprint | cond-mat/0608693)
  • Qubit-Photon Interactions in a Cavity: Measurement Induced Dephasing and Number Splitting J. Gambetta, A. Blais, D.I. Schuster, A. Wallraff, L. Frunzio, J. Majer, M.H. Devoret, S.M. Girvin, and R.J. Schoelkopf. Phys Rev A 74, 042318 (2006), doi:10.1103/PhysRevA.74.042318 (cond-mat/0602322)
  • AC-Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
    D. I. Schuster, A. Wallraff, A. Blais, L. Frunzio, R.-S. Huang, J. Majer, S. M. Girvin and R. J. Schoelkopf. Physical Review Letters 94, 123602 (2005), (HiRes preprint | cond-mat/0408367)
  • Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
    A. Wallraff, D. I. Schuster, A. Blais, L. Frunzio, J. Majer, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf. Physical Review Letters 95, 060501 (2005), (preprint)
  • Circuit quantum electrodynamics: Coherent coupling of a single photon to a Cooper pair box
    A. Wallraff, D. I. Schuster, A. Blais, L. Frunzio, R.-S. Huang, J. Majer, S. Kumar, S. M. Girvin and R. J. Schoelkopf. Nature (London) 431 162 (2004) (HiRes Reprint | News and Views | cond-mat/0407325)
  • Cavity quantum electrodynamics for superconducting electrical circuits: an architecture for quantum computation
    Alexandre Blais, Ren-Shou Huang, Andreas Wallraff, S. M. Girvin and R. J. Schoelkopf Physical Review A 69, 062320 (2004) (reprint | cond-mat/0402216)
  • Prospects of strong cavity quantum electrodynamics with superconducting circuits
    S. M. Girvin, Ren-Shou Huang, Alexandre Blais, Andreas Wallraff and R. J. Schoelkopf. Proceedings of Les Houches Summer School, Session LXXIX, Quantum Entanglement and Information Processing (2003) (cond-mat/0310670)
  • Fabrication and characterization of superconducting circuit QED devices for quantum computation,
    L. Frunzio, A. Wallraff, D. I. Schuster, J. Majer, and R. J. Schoelkopf
    IEEE Transactions on Applied Superconductivity 15, 860 (2005)
    Proceedings of Applied Superconductivity Conference, Jacksonville, FL (2004)
    (reprint | preprint)

Image Gallery

Images may be used when credited to "Schoelkopf Lab, Yale University".

The Circuit QED Team

Media Coverage

Author Contact information:

Professor Robert Schoelkopf rob.schoelkopf@yale.edu (203) 432-4289
Professor Steven Girvin steven.girvin@yale.edu (203) 432-5082

Additional contact at Yale:

Professor Michel Devoret michel.devoret@yale.edu (203) 432-4277