Physics – Condensed Matter – Superconductivity
Scientific paper
2008-10-14
Phys. Rev. B 79, 024519 (2009)
Physics
Condensed Matter
Superconductivity
10 pages, 8 figures
Scientific paper
10.1103/PhysRevB.79.024519
Coherent control and the creation of entangled states are discussed in a system of two superconducting flux qubits interacting with each other through their mutual inductance and identically coupling to a reservoir of harmonic oscillators. We present different schemes using continuous-wave control fields or Stark-chirped rapid adiabatic passages, both of which rely on a dynamic control of the qubit transition frequencies via the external bias flux in order to maximize the fidelity of the target states. For comparison, also special area pulse schemes are discussed. The qubits are operated around the optimum point, and decoherence is modelled via a bath of harmonic oscillators. As our main result, we achieve controlled robust creation of different Bell states consisting of the collective ground and excited state of the two-qubit system.
Evers Joep
Keitel Christoph H.
Macovei Mihai
Xia Ke
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