The two Josephson junction flux qubit with large tunneling amplitude

Physics – Condensed Matter – Superconductivity

Scientific paper

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7 pages, 4 figures

Scientific paper

10.1063/1.2967504

In this paper we discuss solid-state nanoelectronic realizations of Josephson flux qubits with large tunneling amplitude between the two wells. The latter can be controlled via the height and form of the barrier, which is determined by quantum-state engineering of the flux qubit circuit. The simplest circuit of the flux qubit is a superconducting loop interrupted by a Josephson nanoscale tunnel junction. The tunneling amplitude between two macroscopically different states can be essentially increased, by engineering of the qubit circuit, if tunnel junction is replaced by a ScS contact. However, only Josephson tunnel junctions are particularly suitable for large-scale integration circuits and quantum detectors with preset-day technology. To overcome this difficulty we consider here novel flux qubit with high-level energy separation between "ground" and "excited" states, which consists of a superconducting loop with two low-capacitance Josephson tunnel junctions in series. We demonstrate that for real parameters of resonance superposition the splitting amplitude can reach values greater than 1 K. Analytical results obtained with instanton technique show good correlation with a numerical exact solution.

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