Generation of quadripartite continuous-variable entanglement in two coupled opto-mechanical systems

Wu, E; Liu, Jia; Chao, Luomeng; Qiao, Jie; Niu, Jinyan; He, Jianli; Zhang, Yong; Ma, Yonghong

doi:10.1088/1555-6611/ab8933

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…Quantum entanglement, a particular form of quantum correlation, has garnered extensive investigation across diverse quantum systems. [17][18][19][20] It offers a profound insight into the foundational structure of quantum mechanics, serving as the principal demarcation between macroscopic (classical) and microscopic (quantum) systems. [21][22][23] Moreover, quantum entanglement has evolved into an indispensable asset in the realm of quantum information processing, where it underpins the remarkable computational speed of quantum computing and the unequivocal security of quantum communication.…”

Section: Introductionmentioning

confidence: 99%

Quantum correlations and entanglement in coupled optomechanical resonators with photon hopping via Gaussian interferometric power analysis

Lahlou,

Maroufi,

Daoud

2024

Chinese Phys. B

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Quantum correlations that surpass entanglement are of great importance in the realms of quantum information processing and quantum computation. Essentially, for quantum systems prepared in pure states, it is difficult to differentiate between quantum entanglement and quantum correlation. Nonetheless, this indistinguishability is no longer holds for mixed states. To contribute to a better understanding of this differentiation, we have explored a simple model for both generating and measuring these quantum correlations. Our study concerns two macroscopic mechanical resonators placed in separate Fabry-Perot cavities, coupled through the photon hopping process. this system offers a comprehensively way to investigate and quantify quantum correlations beyond entanglement between these mechanical modes. The key ingredient in analyzing quantum correlation in this system is the global covariance matrix. It forms the basis for computing two essential metrics: the Logarithmic Negativity ($E_\mathcal{N}^m$) and the Gaussian Interferometric Power ($\mathcal{P}_{\mathcal{G}}^{m}$). These metrics provide the tools to measure the degree of quantum entanglement and quantum correlations, respectively. Our study reveals, that the Gaussian Interferometric Power ($\mathcal{P}_{\mathcal{G}}^{m}$) proves to be a more suitable metric for characterizing quantum correlations among the mechanical modes in an optomechanical quantum system, particularly in scenarios featuring resilient photon hopping.

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Section: Introductionmentioning

confidence: 99%

Quantum correlations and entanglement in coupled optomechanical resonators with photon hopping via Gaussian interferometric power analysis

Lahlou,

Maroufi,

Daoud

2024

Chinese Phys. B

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“…Squeezed states of light, in which the quantum noise of one quadrature is reduced below that of coherent state, have become a key resource in quantum optics [1][2][3]. They also have attracted great attention in various practical applications in quantum communications [4], quantum information processing [5,6], ultrahigh-precision measurement [7,8]. For these applications, one of the important issues is to obtain a high-level squeezed state.…”

Section: Introductionmentioning

confidence: 99%

Generation of Long-Term Stable Squeezed Vacuum States Using Dither-Locking Technique

Han

Zhu

et al. 2022

Photonics

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We report the generation of long-term stable squeezed vacuum states at 1064 nm using a degenerate optical parametric amplifier (DOPA) with a periodically poled KTiOPO4 crystal (PPKTP). The OPA is pumped by a 532 nm light produced by frequency doubling the fundamental light with a bow-tie enhancement second harmonic generator (SHG). When the DOPA and relative phases are locked using a dither-locking method, the squeezed vacuum states are stably measured over 2 h at 11 MHz. The highly compact and simple squeezed light source is suitable for applications in quantum optics experiments.

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“…Unquestionably, the different kinds of quantum correlations [24], like quantum entanglement [25,26], non-locality, are playing a paramount role in various areas of quantum information processing. Indeed, the entanglement was recognized as an essential resource employed for quantum computing [27], cryptographic protocols [28], and realized quantum teleportation [24].…”

Section: Introductionmentioning

confidence: 99%

Quantifying quantum correlations in noisy Gaussian channels

Lahlou¹,

Baqmou²,

Maroufi³

et al. 2022

Preprint

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The Gaussian states are essential ingredients in many tasks of quantum information processing.The presence of the noises imposes limitations on achieving these quantum protocols. Therefore, examining the evolution of quantum entanglement and quantum correlations under the coherence of Gaussian states in noisy channels is of paramount importance. In this paper, we propose and analyze a scheme that aims to specify and examine the dynamic evolution of the quantum correlations in twomodes Gaussian states submitted to the influence of the Gaussian thermal environment. We describe

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Generation of quadripartite continuous-variable entanglement in two coupled opto-mechanical systems

Cited by 6 publications

References 39 publications

Quantum correlations and entanglement in coupled optomechanical resonators with photon hopping via Gaussian interferometric power analysis

Quantum correlations and entanglement in coupled optomechanical resonators with photon hopping via Gaussian interferometric power analysis

Generation of Long-Term Stable Squeezed Vacuum States Using Dither-Locking Technique

Quantifying quantum correlations in noisy Gaussian channels

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