High fidelity measurement and quantum feedback control in circuit QED

Details High fidelity measurement and quantum feedback control in circuit QED High fidelity measurement and quantum feedback control in circuit QED

2005-08-31

arxiv.org/abs/quant-ph/0508232v2

Phys. Rev. A, 72, 062327 (2005)

Physics

Quantum Physics

11 pages, 6 figures. Typos fixed. Published version

Scientific paper

10.1103/PhysRevA.72.062327

Circuit QED is a promising solid-state quantum computing architecture. It also has excellent potential as a platform for quantum control -- especially quantum feedback control -- experiments. However, the current scheme for measurement in circuit QED is low efficiency and has low signal-to-noise ratio for single shot measurements. The low quality of this measurement makes the implementation of feedback difficult, and here we propose two schemes for measurement in circuit QED architectures that can significantly improve signal-to-noise, and potentially achieve quantum limited measurement. Such measurements would enable the implementation of quantum feedback protocols and we illustrate this with a simple entanglement stabilization scheme.

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