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Results in Physics

Multi-color quantum steering frequency comb produced by enhanced Raman scattering

Kaisen Pan, T.H. Chen, C. Xiao, Youbin Yu, Aixi Chen

Published Apr 18, 2022• 3 citations
Publisher

Abstract

A scheme is proposed to generate multi-color quantum steering frequency comb in a two-dimensional hexagonal-poled LiTaO3 crystal through enhanced Raman scattering. The quantum steering correlations among the Stokes and anti-Stokes Raman beams are demonstrated by applying the criteria for genuine multipartite steering. Multi-color quantum steering frequency comb generated in present scheme has potential application prospects in quantum information processing.

DOI
10.1016/j.rinp.2022.105518

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A scheme is proposed to generate multi-color quantum steering frequency comb in a two-dimensional hexagonal-poled LiTaO3 crystal through enhanced Raman scattering. The quantum steering correlations among the Stokes and anti-Stokes Raman beams are demonstrated by applying the criteria for genuine multipartite steering. Multi-color quantum steering frequency comb generated in present scheme has potential application prospects in quantum information processing.
Abstract 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.
Continuous-variable (CV) entanglement frequency comb can be produced by enhanced Raman scattering in an above-threshold optical oscillator cavity in which a hexagonally-poled LiTaO3 crystal resides as a Raman gain medium. The Stokes and anti-Stokes Raman signals are enhanced by a coupled quasi-phase-matching optical parametric process and the entanglement natures among these Raman signals and pump are demonstrated by applying a sufficient inseparability criterion for CV entanglement. Such entanglement frequency comb source with different frequencies and continuously tunable frequency interval may be very significant for the applications in quantum communication and networks.
We propose a scheme to produce continuous-variable pair-entanglement frequency comb by enhanced Raman scattering in an optical oscillator cavity in which a hexagonally poled LiTaO3{\text{LiTaO}}_{3}LiTaO3​ locates as a Raman gain crystal. The Stokes and anti-Stokes Raman signals are enhanced by a coupled quasi-phase-matching optical parametric process and their entanglement characteristics are studied by applying necessary and sufficient inseparability criterion for continuous-variable entanglement. This scheme of generating continuous-variable pair-entanglement frequency comb source may be very significant for the application in quantum communication and computation networks.
Multipartite quantum steering is an important quantum resource and the basis of quantum computing and quantum secure communication. In this paper, a scheme is proposed to produce genuine five-partite quantum steering by an injected signal optical parametric oscillation cascaded with two sum-frequency processes. First, an idler beam is generated by a difference-frequency generation process between the pump and the injected signal in an optical superlattice. By using the quasi-phase-matching technique, two sum-frequency beams are generated by the sum-frequency processes of pump and idler beams as well as pump and injected signals in the same optical superlattice. It is found that the genuine five-partite steering exists by applying a criterion for genuine multipartite quantum steering. Finally, the variation properties of the quantum steering with parameters are discussed. The genuine five-partite quantum steering generated by the present scheme has potential applications in quantum computing and quantum secure communication.
Multipartite quantum steering is an important quantum resource and the basis of secure quantum communication network. Multipartite quantum steering can be generated by beam splitter networks, optical frequency comb systems and nonlinear processes. Different types of quantum steering will be produced by different projects. In this paper, we design two different schemes, i.e. series cascaded four-wave mixing and hybrid cascaded four-wave mixing, and based on these two schemes tripartite quantum steering and quinquepartite quantum steering are generated respectively. The steering characters among different users are quantified based on the covariance matrix. In theory, we investigate steering parameters among different modes created by two schemes versus the amplitude gain of four-wave mixing process. We find that one mode can steer the other two modes separately, but the other two modes cannot steer the one mode simultaneously. By comparing the steering characters of joint multimodes to a certain single mode with the individual mode to the single mode respectively, it can be seen that the steerability of the former is stronger than the latter in the whole gain region, and there exists only the steering of joint multimodes to a single mode in the partial gain region. More importantly, the steerability of joint multimodes to a single mode can be enhanced with the quantity of joint multimodes increasing. The results show that multiple types of quantum steering can be realized by using these two schemes, which are helpful in understanding the distribution of quantum steering in multipartite system and have important significance in practical secure quantum communication and quantum secret sharing.
Quantum steering is the essential resource for quantum information processing. In this letter, a scheme is proposed to generate genuine quadripartite Einstein-Podolsky-Rosen (EPR) steering by an optical parametric oscillation cascaded with a sum-frequency process. Idler beam is generated by a difference frequency generation process between pump and injected signal in an optical superlattice. Then, a sum-frequency beam is produced by the cascaded sum-frequency process between pump and idler beams in the same optical superlattice by the quasi-phase-matching technique. The genuine quadripartite EPR steering among pump, signal, idler, and sum-frequency beams is confirmed in this scheme by applying a criteria for genuine multipartite EPR steering. The variation properties of the EPR steering with pump and nonlinear coupling coefficients are also discussed.