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The second generation of interferometric gravitational wave detectors arequickly approaching their design sensitivity. For the first time thesedetectors will become limited by quantum back-action noise. Several back-actionevasion techniques have been proposed to further increase the detectorsensitivity. Since most proposals rely on a flexible readout of the fullamplitude- and phase-quadrature space of the output light field, balancedhomodyne detection is generally expected to replace the currently used DCreadout. Up to now, little investigation has been undertaken into how balancedhomodyne detection can be successfully transferred from its ubiquitousapplication in table-top quantum optics experiments to large-scaleinterferometers with suspended optics. Here we derive implementationrequirements with respect to local oscillator noise couplings and highlightpotential issues with the example of the Glasgow Sagnac Speed Meter experiment,as well as for a future upgrade to the Advanced LIGO detectors.

Local-Oscillator Noise Coupling in Balanced Homodyne Readout for Advanced Gravitational Wave Detectors