Cooper-pair qubit and Cooper-pair electrometer in one device

Details Cooper-pair qubit and Cooper-pair electrometer in one device Cooper-pair qubit and Cooper-pair electrometer in one device

2001-12-19

arxiv.org/abs/cond-mat/0112351v1

Physica C, 368, 284 (2002)

Physics

Condensed Matter

Superconductivity

4 pages incl. 3 figues; the SQUID'2001 paper, to be published in Physica C

Scientific paper

10.1016/S0921-4534(01)01182-0

An all-superconductor charge qubit enabling a radio-frequency readout of its quantum state is described. The core element of the setup is a superconducting loop which includes the single-Cooper-pair (Bloch) transistor. This circuit has two functions: First, it operates as a charge qubit with magnetic control of Josephson coupling and electrostatic control of the charge on the transistor island. Secondly, it acts as the transducer of the rf electrometer, which probes the qubit state by measuring the Josephson inductance of the transistor. The evaluation of the basic parameters of this device shows its superiority over the rf-SET-based qubit setup.

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