Whispering galleries and the control of artificial atoms

Derek Michael Forrester, Feodor V. Kusmartsev
  • Scientific Reports, April 2016, Nature Publishing Group
  • DOI: 10.1038/srep25084

What is it about?

In this work two superconducting qubits/artificial atoms, operating with spontaneously generated magnetic moments (pi -ring qubits), are controlled by linear chains of whispering mode micro-resonators, incorporating nanoscale notches, that “pump” at terahertz frequencies to generate a quantum phase gate. For specific conditions between these whispering gallery/qubit hybrids it is found that a sudden death of entanglement occurs, only for its rebirth to occur at a later stage. This is the phenomenon of entanglement sudden death (ESD) and is shown through the measure of system concurrence. The work highlights that small system perturbations can lead to incredible dynamics and a breakdown of stability. This is essential information for designing robust; long-lifetime superconducting artificial atom systems based on quantum gating and novel control architectures. The work represents the first time that such a hybrid system has been proposed, where all the constituent parts can operate without any wiring (electrically isolated), and for the phase gate to develop ESD phenomena.

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