Balanced homodyne detection with on-off detector systems: Observable nonclassicality criteria
1 Arbeitsgruppe Theoretische Quantenoptik, Institut für Physik, Universität Rostock - D-18051 Rostock, Germany
2 Department of Physics, Oklahoma State University - Stillwater, OK 74078, USA
Received: 26 November 2014
Accepted: 20 January 2015
Driven by single photon detection requirements, the theory of arrays of off-on detectors has been developed and applied. However, for a comprehensive characterization of nonclassicality, one also needs phase sensitive properties. This missing link is introduced with the derived theory of phase sensitive click counting measurements. It unifies the balanced homodyne detection for high intensities with the click detection in the few-photon regime. We formulate a hierarchy of nonlinear squeezing conditions to probe quantum effects beyond standard squeezing. Imperfections stemming from fluctuations, detector efficiency, and dark count rates are considered. Experimentally accessible sampling formulas are given. Our theory paves the way towards novel applications of light in quantum metrology.
PACS: 42.50.-p – Quantum optics / 42.50.Dv – Quantum state engineering and measurements
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