Readout methods and devices for Josephson-junction-based solid-state qubits

Abstract

We discuss the current situation concerning measurement and readout of Josephson-junction based qubits. In particular we focus attention of dispersive low-dissipation techniques involving reflection of radiation from an oscillator circuit coupled to a qubit, allowing single-shot determination of the state of the qubit. In particular we develop a formalism describing a charge qubit read out by measuring its effective (quantum) capacitance. To exemplify, we also give explicit formulas for the readout time.

20 pages, 7 figures. To be published in J. Phys.: Condensed Matter, 18 (2006) Special issue: Quantum computing

References in corpus (3)

• Scalable multi-particle entanglement of trapped ions
• Approaching Unit Visibility for Control of a Superconducting Qubit with Dispersive Readout
• Cavity QED in superconducting circuits: susceptibility at elevated temperatures

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• Displacement Detection with a Vibrating RF SQUID: Beating the Standard Linear Limit
• Probing the quantum coherence of a nanomechanical resonator using a superconducting qubit II: Implementation