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Superconducting Qubits

Implementing generalized measurements with superconducting qubits

arXiv
Authors: Justin Dressel, Todd A. Brun, Alexander N. Korotkov

Year

2013

Paper ID

31587

Status

Preprint

Abstract Read

~2 min

Abstract Words

94

Citations

N/A

Abstract

We describe a method to perform any generalized purity-preserving measurement of a qubit with techniques tailored to superconducting systems. First, we consider two methods for realizing a two-outcome partial projection: using a thresholded continuous measurement in the circuit QED setup, or using an indirect ancilla qubit measurement. Second, we decompose an arbitrary purity-preserving two-outcome measurement into single qubit unitary rotations and a partial projection. Third, we systematically reduce any multiple-outcome measurement to a sequence of such two-outcome measurements and unitary operations. Finally, we consider how to define suitable fidelity measures for multiple-outcome generalized measurements.

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  • This paper contributes to the Superconducting Qubits research area in the Quantum Articles archive.
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  • We describe a method to perform any generalized purity-preserving measurement of a qubit with techniques tailored to superconducting systems.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1312.1319 [2] arXiv https://arxiv.org/abs/1312.1319 [3] Publisher https://arxiv.org/abs/1312.1319

Local Citation Graph (Related-Paper Links)

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