Schrödinger Cat States and Quantum Error Correction for Bosonic Modes (Prof. S. Girvin)

  • Date: Feb 7, 2017
  • Time: 02:30 PM - 03:30 PM (Local Time Germany)
  • Speaker: Prof. Dr. Steven Girvin, Department of Physics, Yale University, USA
  • Room: Herbert Walther Lecture Hall
  • Host: MPQ
Recent remarkable experimental progress in ‘circuit QED’ now allows realization of extremely strong dispersive coupling between superconducting qubits and microwave photons in resonators.

The resulting ‘quantum toolbox’ permits universal control of qubit and resonator states and the ability to test new error correction codes which extend the lifetime of quantum information stored in the collective system beyond the time it could be stored in the best individual component of the system. Paradoxically, some of these successful codes are based on Schrödinger cat states, normally thought to be extremely fragile holders of quantum information. These ‘cat codes’ are members of a general class of quantum error correction codes which store quantum information in coherent superpositions of photon Fock states and which can survive various errors including photon loss, gain and dephasing.

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