Physics – Condensed Matter – Superconductivity
Scientific paper
2010-08-25
Phys. Rev. B 84, 104505 (2011)
Physics
Condensed Matter
Superconductivity
4 figures
Scientific paper
We demonstrate experimentally the creation and measurement of an entangled state between a microscopic two level system and a macroscopic superconducting resonator where their indirect interaction is mediated by an artificial atom, a superconducting persistent current qubit (PCQB). We show that the microscopic two level system, formed by a defect in an oxide layer, exhibits an order of magnitude longer dephasing time than the PCQB, while the dephasing time of the entangled states between the microscopic two level system and macroscopic superconducting resonator is significantly longer than the dephasing time in the persistent current qubits. This demonstrates the possibility that a qubit of moderate coherence properties can be used in practice to address low decoherence quantum memories by connecting them to macroscopic circuit QED quantum buses, leading future important implications for quantum information processing tasks.
Kemp Alexander
Munro William J.
Nemoto Kae
Saito Shiro
Semba Kouichi
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