Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 4: Quantum Optics I
Q 4.2: Vortrag
Montag, 6. März 2017, 15:00–15:15, P 5
Phase-insensive test of phase-squeezed state nonclassicality — •Melanie Mraz1, Benjamin Kühn2, Semjon Köhnke1, Werner Vogel2, and Boris Hage1 — 1AG Experimentelle Quantenoptik, Institut für Physik, Universität Rostock — 2AG Theoretische Quantenoptik, Institut für Physik, Universität Rostock
We experimentally realized the homodyne cross correlation detection (HCCD) proposed in [1]. This technique is based on an intensity noise correlation. Three different normally ordered moments of field amplitude and intensity are extracted from the recorded correlation in two dissimilar ways; by phase periodicity and by order of the local oscillator strength. We used a coherently displaced phase-squeezed state at 1064 nm with approx. -2.7dB squeezing generated in an optical parametric amplifier (OPA). To verify the presented method and to analyze the amount of squeezing, we used a standard balanced homodyne detector (BHD). The special features of our HCCD are an unbalanced splitting ratio of 14:86 and a matched local oscillator (LO) power to the order of magnitude of the signal power. This delivers us the needed information of three different normal ordered moments of field amplitude and intensity. A nonclassicality criterion is developed which is solely based on these moments. Remarkably, this test certifies quantum correlations for all phases, i.e., even in the antisqueezed region, of the generated squeezed state. Furthermore, the analysis of the data is free of quantum physical assumptions as present in the standard balanced homodyne detection.
[1] W. Vogel, Phys. Rev. A 51, 4160 (1995).