Dressing control of three-mode entanglement in two cascaded four-wave mixing

Abstract

We report the control of the dressed state in three-mode optical entanglement in an N-type four-level system using two cascaded parametric amplification four-wave mixing steps inside an atom-like optical cavity and injected by thermal optical fields: a coherent field and the Einstein-Podolsky-Rosen field. First, cavity dressing results in Aulter-Towns-like (AT-like peak) anti-squeezing. And the three-cavity dressing interaction induces multi-AT-like peaks. Meanwhile, the cavity enhanced nonlinear gain results in one squeezing dip polariton. In addition, the coupling of three enhanced nonlinear gains brings about multi-dip squeezing. Second, as two nonlinear coefficients change, the nonlinear phase makes the squeezing profile (in phase, amplification) turn into an anti-squeezing profile due to nonlinear loss (out of phase, de-amplification). Finally, the squeezing profile can also be modified by field dressing (AT splitting, enhancement and suppression), and the squeezing degree is affected by injection fields. Thus, by judging the squeezing of three nonseparability criteria, we get three-mode optical entanglement.

Three-color entanglement generated by single-pass cascaded sum-frequency processes

“…Quantum entanglement is the key resource in applications such as quantum communication and quantum computation. Multicolor entanglement (multipartite entangled beams with different frequencies) has attracted considerable interest recently [1][2][3][4][5][6][7][8][9] since it has potential applications such as quantum communication and quantum networks. Two-color continuousvariable (CV) entanglement was first proposed to be generated by nondegenerate optical parametric oscillator (NOPO) [10].…”

Temperature switch and router of two and three-mode noise correlation in Pr3+:YSO crystal

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Two- and three-mode intensity-difference squeezing in cascaded four-wave mixing inside an optical cavity

“…With κ 2 = 0.9, we get maximum squeezing, −10 dB, at Δ/(γ + γ c ) = ±1. As the number of quantum modes increases, the total degree of quantum correlations enhances [22]. Subsequently, we investigate the control of the cavity dressing on three-mode squeezing with different nonlinear coefficients in figures 3 and 4.…”