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Figure 9 | EPJ Quantum Technology

Figure 9

From: Geometric control theory for quantum back-action evasion

Figure 9

Normalized power spectral densities of the noise. The black solid line represents the SQL (35), and the dot-dashed blue line does the case without feedback. The dotted green and dashed red lines show the cases for the feedback controlled system, with coherent and squeezed probe field, respectively.

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