Pulsed entanglement measured by parametric amplifier assisted homodyne detection

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

8 Scopus Citations
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Author(s)

  • Jiamin LI
  • Yuhong LIU
  • Nan HUO
  • Liang CUI
  • Chang FENG
  • Xiaoying LI

Detail(s)

Original languageEnglish
Pages (from-to)30552-30562
Journal / PublicationOptics Express
Volume27
Issue number21
Online published8 Oct 2019
Publication statusPublished - 14 Oct 2019
Externally publishedYes

Link(s)

Abstract

Balanced homodyne detection relies on a beam splitter to superpose the weak signal input and strong local oscillator. However, recent investigation shows that a high gain phase sensitive amplifier (PSA) can be viewed as homodyne detector, in which the strong pump of PSA serves as the local oscillator [1]. Here, we analyze a new method of measuring the continuous variable entanglement by assisting a balanced homodyne detector with the PSA and implement it experimentally. Before measuring quadrature amplitude with the balanced homodyne detectors, two entangled fields generated from a pulse pumped fiber optical parametric amplifier are simultaneously coupled into the PSA. We find that the normalized noise for both the difference and sum of the quadrature amplitudes of the two entangled fields fall below the shot noise limit by about 4.6 dB, which is the record degree of entanglement measured in optical fiber systems. The experimental results illustrate that the advantages of the new measurement method include but not limit to tolerance to detection loss and characterizing entanglement with only one homodyne detector. The influence of mode-mismatching due to multi-mode property of entanglement on the measured noise reduction can also be greatly mitigated, indicating the new method is advantageous over the traditional measurement in multi-mode case.

Research Area(s)

Citation Format(s)

Pulsed entanglement measured by parametric amplifier assisted homodyne detection. / LI, Jiamin; LIU, Yuhong; HUO, Nan; CUI, Liang; FENG, Chang; OU, Z. Y.; LI, Xiaoying.

In: Optics Express, Vol. 27, No. 21, 14.10.2019, p. 30552-30562.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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