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

Abstract

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.

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

References in corpus (1)

• Radio-frequency Bloch-transistor electrometer

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• Flux Qubit in Charge-Phase Regime
• Current-Phase Relation and Josephson Inductance of Superconducting Cooper Pair Transistor
• Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits
• Ground-state characterization of Nb charge-phase Josephson qubits
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• Rf-induced transport of Cooper pairs in superconducting single electron transistors in a dissipative environment
• Quasi-particle transitions in charge-phase qubits probed by rf oscillations
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