Quantum computing and condensed matter physics with microwave photons

Condensed matter physics with photons

Photons do not in general interact.  However, in a cavity QED system, a qubit can mediate an effective interaction between photons.  In coupled arrays of such cQED elements, photons can hop between neighboring cavities and experience on-site interactions in any one cavity.  Such arrays are expected to support many-body states of photons and interesting matter-like behavior.  Because photon number is not a conserved quantity, such behavior is far from equilibrium and an area of particular interest.  We are building large cavity arrays to study these predictions experimentally.

Associated Publications:

  1. Dispersive Photon Blockade in a Superconducting Circuit
    A. J. Hoffman, S. J. Srinivasan, S. Schmidt, L. Spietz, J. Aumentado, H. E. Türeci, and A. A. Houck
    Phys. Rev. Lett. 107, 053602 (2011) (pdf)
  2. Time-reversal-symmetry breaking in circuit-QED-based photon lattices
    Jens Koch, Andrew A. Houck, Karyn Le Hur, and S. M. Girvin
    Phys. Rev. A 82, 043811 (2010) (pdf)
  3. Nonequilibrium delocalization-localization transition of photons in circuit quantum electrodynamics
    S. Schmidt, D. Gerace, A. A. Houck, G. Blatter, and H. E. Türeci
    Phys. Rev. B 82, 100507(R) (2010) (pdf)