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European Quantum Electronics Conference (EQEC)

Efficient polarization squeezing in optical fibers

J. Heersink, Vincent Josse, Gerd Leuchs, Ulrik L. Andersen

Published Jan 18, 2006• 9 citations
Publisher

Abstract

A novel scheme to generate continuous variable polarization squeezing, using intense, femtosecond pulsed laser beams at 1500 nm in a single pass through a polarization maintaining fiber is reported in the paper. The system generates directly measurable polarization squeezing without the need for auxiliary resources and is thus in principle limited only by the system's linear losses. The experimental setup also allows for the direct measurement of the squeezing angle.

DOI
10.1109/eqec.2005.1567440

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A novel scheme to generate continuous variable polarization squeezing, using intense, femtosecond pulsed laser beams at 1500 nm in a single pass through a polarization maintaining fiber is reported in the paper. The system generates directly measurable polarization squeezing without the need for auxiliary resources and is thus in principle limited only by the system's linear losses. The experimental setup also allows for the direct measurement of the squeezing angle.
We experimentally demonstrate the generation of polarization-squeezed light in a short piece of solid-core chalcogenide (ChG) (As2S3) fiber via the Kerr effect for femtosecond pulses at 1.56 µm. Directly measured squeezing of −2.8 dB is obtained in a setup without active stabilization. Numerical simulations are in good agreement with the experimental results and indicate that the measured squeezing in our setup is mainly limited by the losses in the detection system rather than by the fiber properties.
Bright squeezed light can be generated in optical fibers utilizing the Kerr effect for ultrashort laser pulses. However, pulse propagation in a fiber is subject to nonconservative effects that deteriorate the squeezing. Here, we analyze two-mode polarization squeezing, which is SU(2)-invariant, robust against technical perturbations, and can be generated in a polarization-maintaining fiber. We perform a rigorous numerical optimization of the process and the pulse parameters using our advanced model of quantum pulse evolution in the fiber that includes various nonconservative effects and real fiber data. Numerical results are consistent with experimental results.
We report new experiments on polarization squeezing using ultrashort photonic pulses in a single pass of a birefringent fiber. We measure what is to our knowledge a record squeezing of -6.8+/-0.3 dB in optical fibers, which when corrected for linear losses is -10.4+/-0.8 dB. The measured polarization squeezing as a function of optical pulse energy, which spans a wide range from 3.5-178.8 pJ, shows a very good agreement with the quantum simulations, and for the first time we see the proof experimentally that Raman effects limit and reduce squeezing at high pulse energy.
Abstract Squeezed light is one of the resources of photonic quantum technology. Among the various nonlinear interactions capable of generating squeezing, the optical Kerr effect is particularly easy‐to‐use. A popular venue is to generate polarization squeezing, which is a special self‐referencing variant of two‐mode squeezing. To date, polarization squeezing generation setups have been very sensitive to fluctuations of external factors and have required careful tuning. In this work, a development of a new all‐fiber setup for polarization squeezing generation is reported. The setup consists of passive elements only and is simple, robust, and stable. More than 5 dB of directly measured squeezing is obtained over long periods of time without any need for adjustments. Thus, the new scheme provides a robust and easy‐to‐set‐up way of obtaining squeezed light applicable to different applications. The impact of pulse duration and pulse power on the degree of squeezing is investigated.