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

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

2006-02-24

arxiv.org/abs/cond-mat/0602585v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

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

Scientific paper

10.1088/0953-8984/18/21/S14

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.

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