Reading-out the state inductively and microwave spectroscopy of an interferometer-type charge qubit

Details Reading-out the state inductively and microwave spectroscopy of an interferometer-type charge qubit Reading-out the state inductively and microwave spectroscopy of an interferometer-type charge qubit

2003-12-30

arxiv.org/abs/cond-mat/0312696v2

Phys. Rev. B 70, 180501 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, revised version, to appear in PRB Rapid Comm

Scientific paper

10.1103/PhysRevB.70.180501

We implemented experimentally an interferometer-type charge qubit consisting of a single-Cooper-pair transistor closed by a superconducting loop that is in flip-chip configuration inductively coupled to a radio frequency tank circuit. The tank permits to readout the qubit state, acting as inductance measuring apparatus. By applying continuous microwave power to the quantum device, we observed inductance alterations caused by redistributions of the energy level populations. From the measured data, we extracted the energy gap between ground and upper levels as a function of the transistor quasicharge as well as the Josephson phase across both junctions.

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