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arXiv · 1906.07213

Polarization-Based Truncated SU(1,1) Interferometer based on Four-wave Mixing in Rb vapor

Nikunjkumar Prajapati·Irina Novikova
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Abstract

We propose and demonstrate a polarization-based truncated SU(1,1) interferometer that outputs the desired optical joint-quadrature of a two-mode squeezed vacuum field and allows its measurements using a single balanced homodyne detector. Using such setup we demonstrated up to $\approx$2 dB of quantum noise suppression below the shot-noise limit in intensity-difference and phase-sum joint quadratures, and confirmed entanglement between the two quantum fields. Our proposed technique results in a better balance between the two ports of the detector and, consequently, in better common noise suppression for differential measurements. As a result, we were able to observe flat joint-quadrature squeezing and entanglement at wide range of detection frequencies: from several MHz (limited by the photodiode gain bandwidth) down to a few hundred Hz (limited by electronic noises).

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Nikunjkumar Prajapati, Irina Novikova. 2019-06-17. Polarization-Based Truncated SU(1,1) Interferometer based on Four-wave Mixing in Rb vapor. https://doi.org/10.1364/ol.44.005921

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