Measuring charge based quantum bits by a superconducting single-electron transistor

Details Measuring charge based quantum bits by a superconducting single-electron transistor Measuring charge based quantum bits by a superconducting single-electron transistor

2002-11-08

arxiv.org/abs/cond-mat/0211154v1

Phys. Rev. B 68, 020506 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, submitted to Phys.Rev.Lett., RevTex4

Scientific paper

10.1103/PhysRevB.68.020506

Single-electron transistors have been proposed to be used as a read-out device for Cooper pair charge qubits. Here we show that a coupled superconducting transistor at a threshold voltage is much more effective in measuring the state of a qubit than a normal-metal transistor at the same voltage range. The effect of the superconducting gap is to completely block the current through the transistor when the qubit is in the logical state 1, compared to the mere diminishment of the current in the normal-metal case. The time evolution of the system is solved when the measuring device is driven out of equilibrium and the setting is analysed numerically for parameters accessible by lithographic aluminium structures.

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