Experimental generation of bright two-mode quadrature squeezed light from a narrow-band nondegenerate optical parametric amplifier

Zhang, Yun; Wang, Hai; Li, Xiaoying; Jing, Jietai; Xie, Changde; Peng, Kunchi

doi:10.1103/physreva.62.023813

Cited by 232 publications

(128 citation statements)

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“…Indeed, the measurements of the frequency spectra of the variances of the output quadrature-phase amplitudes reveal up to 3.7 dB squeezing for NOPA [9], and up to 4.9 dB squeezing for NOPO operating above threshold [18]. However, we remind that our results pertain to the full squeezing of the system and not the spectral component squeezing.…”

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confidence: 43%

“…In the light of experimental investigations of CV quadrature entanglement in NOPA and NOPO [9,18], the obtained value for the highest achievable squeezing of 3 dB (V min = 0.5) may seem inadequate. Indeed, the measurements of the frequency spectra of the variances of the output quadrature-phase amplitudes reveal up to 3.7 dB squeezing for NOPA [9], and up to 4.9 dB squeezing for NOPO operating above threshold [18].…”

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confidence: 99%

“…Straightforward, but complicated analytical calculations on the formula (9) show that δn → −0.125 in the limit p → ∞, which leads to the asymptotic value V min = 0.75 < 1 (find in Appendix B several hints regarding our analysis of δn). Therefore, as our analysis shows with allowance for quantum fluctuations of arbitrary level, CV entanglement is always achieved in NOPO above threshold.…”

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confidence: 99%

“…Further experimental studies of bright two-mode entangled state from cw nondegenerate optical parametric amplifier have been made in Refs. [9]. The generation of CV polarization entanglement by mixing a pair of polarization squeezed beams is realized * gkryuchk@server.physdep.r.am † leman@ipr.sci.am in [10].…”

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Entangled light in transition through the generation threshold

Kryuchkyan

Manukyan

2004

Phys. Rev. A

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We investigate continuous variable entangling resources on the base of two-mode squeezing for all operational regimes of a nondegenerate optical parametric oscillator with allowance for quantum noise of arbitrary level. The results for the quadrature variances of a pair of generated modes are obtained by using the exact steady-state solution of Fokker-Planck equation for the complex Pquasiprobability distribution function. We find a simple expression for the squeezed variances in the near-threshold range and conclude that the maximal two-mode squeezing reaches 50% relative to the level of vacuum fluctuations and is achieved at the pump field intensity close to the generation threshold. The distinction between the degree of two-mode squeezing for monostable and bistable operational regimes is cleared up. [2,3]). An important example provides entangled Einstein-Podolski-Rosen (EPR) state of orthogonally polarized but frequency degenerate beams, efficiently generated via nonlinear optical process of parametric down-conversion. It has been pointed out in [4] and has been demonstrated experimentally in [5] for CV, employing sub-threshold nondegenarate optical parametric oscillator (NOPO). Then a CV entanglement source was built from two independent quadrature squeezed beams combined on a beam-splitter [2]. The generation of CV EPR entanglement using an optical fibre interferometer is also demonstrated [6]. It should be noted that so far most experimental realizations of the CV entanglement on NOPO's have only been operated below threshold. A natural next step is the extension of these investigations to laser-like systems generating entangled bright-light states. Unfortunately, both theoretical and experimental studies of these problems are very complicated and only rare examples are known up to now. Many efforts have been devoted to the study of intensity correlated twin beams from NOPO above threshold [7]. The conditional generation of sub-Poissonian light from bright twin beams in the CV regime is experimentally demonstrated in [8]. Further experimental studies of bright two-mode entangled state from cw nondegenerate optical parametric amplifier have been made in Refs.[9]. The generation of CV polarization entanglement by mixing a pair of polarization squeezed beams is realized * gkryuchk@server.physdep.r.am † leman@ipr.sci.amThe purpose of this paper is to investigate physical properties and the presence of CV entanglement for NOPO in its transition through the generation threshold as well as in the regime of lasing. One of the principal problems in this study is the description of quantum fluctuations. In most theoretical works nonclassical effects and entanglement resources of nonlinear quantum systems are usually described within linear treatment of quantum noise. It is obvious that such approach does not describe the critical ranges (threshold, point of multistability, etc) where the level of quantum noise increases substantially. We use a more adequate approach within the framework of exact nonlinear treatme...

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confidence: 43%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Entangled light in transition through the generation threshold

Kryuchkyan

Manukyan

2004

Phys. Rev. A

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“…Entanglement was produced using nondegenerate parametric amplification [1,2,3], Kerr effect in a silica fibre [4] and four-wave mixing in a fibre optic parametric oscillator [5]. One way to produce the entanglement is by interference of two squeezed light beams.…”

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confidence: 99%