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Optical Fiber Communication Conference

Adaptively optimized detection of bright pico-second twin beams generated in fiber

Hong-Yi Yan, Wen Zhen Zhao, Xueshi Guo, Xiaoying Li

Published Jan 1, 2025• 0 citations
Publisher

Abstract

We demonstrate an adaptive electrical gain optimized detection scheme for pulsed twin beams in optical fiber. Intensity difference squeezing level of -7.5 dB has been measured without the need of accurately calibrating channel losses.
DOI
10.1364/ofc.2025.th2a.60

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Twin beams are useful tools in quantum technologies. However, due to their asymmetry in photon number distribution, a scheme needs to be optimized in order to fully exploit their quantum advantage. Here, we demonstrate a detection scheme for bright pico-second twin beams generated from a fiber optical parametric amplifier, in which the electronic gain of the detecting process is optimized in real time by digital signal processing without accurately calibrating the detection channels. Twin beams of -7.5 dB intensity difference squeezing (IDS) (the highest in an optical fiber system) is generated at a brightness of about 0.1 W in peak power. Our result paves the way for applications of twin beams in time-varying channels with asymmetric loss or noise.
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nonlinearity in an optical fiber can generate optical pulses with continuous variable quantum correlation. However, pairwise correlation of the generated pulses in this system has not been demonstrated. Here we report a time-domain measurement of an intensity difference squeezed state generated in a fiber. With a fast response differential detection system, we show the generated twin-beam pulses are pairwisely correlated, and -3.8-dB (-8.1 dB after detection losses correction) intensity difference squeezing degree is measured in the time domain. Our result is beneficial for generating multi-mode entangled state by time-division multiplexing in fiber system.
We report generation of pulsed twin beams of light through optical parametric amplification in a fiber Sagnac loop. By pumping the Sagnac loop with picosecond pulses at a wavelength near the zero-dispersion wavelength of the fiber, we achieve phase-matched nondegenerate four-wave mixing with gain. For a gain of 2.2, the intensity noises of the amplified signal and the generated idler (conjugate) pulses are found to be correlated by 5.0 dB, and the subtracted noise drops below the shot-noise limit by 1.1 dB (2.6 dB when corrected for losses). We have investigated the gain dependence of the quantum-noise reduction as well as of the intensity noises of the amplified signal and idler pulses. As the gain increases, we observe the onset of excess noise on the idler pulses.
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