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Quantum Electronics and Laser Science Conference

Efficient polarization squeezing as a resource for quantum communication

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

Published Dec 10, 2005• 0 citations
Publisher

Abstract

We report on a novel and efficient source of polarization squeezing using a single pass through an optical fiber. Simply passing this Kerr squeezed beam through a carefully aligned /spl lambda//2 waveplate and splitting it on a polarization beam splitter, we find polarization squeezing of up to 5.1/spl plusmn/0.3 dB. The experimental setup allows for the direct measurement of the squeezing angle.

DOI
10.1109/qels.2005.1548870

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We report on a novel and efficient source of polarization squeezing using a single pass through an optical fiber. Simply passing this Kerr squeezed beam through a carefully aligned /spl lambda//2 waveplate and splitting it on a polarization beam splitter, we find polarization squeezing of up to 5.1/spl plusmn/0.3 dB. The experimental setup allows for the direct measurement of the squeezing angle.
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.
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.
Photonic crystal fibres (PCF) can be tailored to introduce a high effective nonlinear Kerr effect and to create lower amounts of excess noise compared to standard fibres. By exploiting both polarisation axes of the polarisation maintaining PCF we can generate two independent polarisation squeezed beams that can be used to create polarisation entanglement. We generated a maximum squeezing of-3.9 Aring plusmn 0.3 dB and a corresponding anti-squeezing of 16.8 Aring plusmn 0.3 dB. Furthermore we investigate the generation of polarisation squeezing in photonic crystal fibres by using a single pass setup where both the slow and fast axis has to be utilized. Taking advantage of these features and using ultrashort pulses we create polarisation squeezed states with notably higher purity than obtained in standard fibres.