The generation of Continuous-Variable Entanglement Frequency Comb

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Three-color continuous-variable (CV) entangled beams can be produced by single-pass cascaded sum-frequency processes of third-harmonic generation by quasi-phase-matching technique in only one optical superlattice. Firstly, second-harmonic field is generated by the first double-frequency process of the fundamental field. Then, the third-harmonic field can be generated by the second cascaded sum-frequency process between the second-harmonic and the fundamental fields by quasi-phase-matching technique in the same optical superlattice. By using the quantum stochastic method, we investigated the conversion dynamics of the cascaded sum-frequency processes and the quantum correlation nature among the fundamental, second-harmonic, and third-harmonic fields. The results show that the higher conversion efficiency of third-harmonic generation can be achieved with the larger nonlinear coupling parameter of the second cascaded sum-frequency process. We also show that the fundamental, second-, and third-harmonic beams are CV entangled with each other according to the necessary and sufficient CV entanglement criterion. This scheme of three-color entanglement generation without involving optical cavity is easy to realize in experiment. Moreover, the three-color entangled beams are separated by an octave in frequency which has potential applications in quantum communication and computation networks.

Section: Introductionmentioning

confidence: 99%

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

Shi

et al. 2017

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“…Using a nondegenerate optical parametric oscillator process and its complementary process, sum frequency generation can directly produce two-color [8][9][10][11][12] or three-color CV entangled beams [13][14][15][16]. Additionally, cascaded or concurrent nonlinear processes can generate multipartite CV entanglement beams with different frequencies [17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Bright six-partite entanglement from coupled intracavity nondegenerate parametric down-conversion

Wang

Chen

et al. 2017

We propose an experimentally feasible scheme to produce bright six-partite continuousvariable (CV) entanglement by coupled intracavity non-degenerate parametric downconversion operating above-threshold. The six-partite entanglement properties of the output fields are theoretically analyzed according to the sufficient inseparability criterion for multipartite CV entanglement. Such compact tunable multipartite CV entanglement, generated from a coupled system, could be used in quantum communications and networks.

“…Quantum entanglement between electron spin qubits confined in two distant semiconductor quantum dots has recently been realized [11].Two-colour tripartite entangled beams among the fundamental and the second-harmonic fields, that can be produced through type-II SHG systems operating both below [12] and above [13] the threshold, has been proposed. Quantum entanglement can also be produced by cascaded nonlinear processes [14][15][16][17][18][19] and atomic system [20][21][22][23][24]. A traveling-wave without optical oscillator cavity can also generate continuous-variable entanglement by single-pass nonlinear processes [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Multi-colour entanglement directly generated by the enhanced Raman scattering

Shi

et al. 2017

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Multi-colour continuous-variable frequency comb entanglement can be directly generated by enhanced Raman scattering in a hexagonally-poled LiTaO 3 optical superlattice. Raman scattering signals are distinctly boosted by a coupled quasi-phase-matching optical parametric amplification process which has been realized in a previous experiment (Xu et al 2005 Phys. Rev. B 72 064307). The conversion dynamics of the coupled optical parametric amplification process is investigated here using quantum stochastic methodology, and the nature of entanglement among the Raman signals is discussed by applying a necessary and sufficient continuous variable criterion. Multi-colour entanglement with the same frequency interval can be obtained directly, with no optical oscillator cavity, in the enhanced Raman scattering process; this has potential application in quantum communication and computation networks.