Adaptive homodyne phase discrimination and qubit measurement

Details Adaptive homodyne phase discrimination and qubit measurement Adaptive homodyne phase discrimination and qubit measurement

2007-06-18

arxiv.org/abs/0706.2507v2

Phys. Rev. A, 76, 052316 (2007)

Physics

Quantum Physics

9 pages, 8 figures. Published version

Scientific paper

10.1103/PhysRevA.76.052316

Fast and accurate measurement is a highly desirable, if not vital, feature of quantum computing architectures. In this work we investigate the usefulness of adaptive measurements in improving the speed and accuracy of qubit measurement. We examine a particular class of quantum computing architectures, ones based on qubits coupled to well controlled harmonic oscillator modes (reminiscent of cavity-QED), where adaptive schemes for measurement are particularly appropriate. In such architectures, qubit measurement is equivalent to phase discrimination for a mode of the electromagnetic field, and we examine adaptive techniques for doing this. In the final section we present a concrete example of applying adaptive measurement to the particularly well-developed circuit-QED architecture.

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