Multipartite continuous-variable entanglement from concurrent nonlinearities

Pfister, Olivier; Feng, Sheng; Jennings, Gregory; Pooser, Raphael C.; Xie, Daruo

doi:10.1103/physreva.70.020302

Cited by 122 publications

(140 citation statements)

References 23 publications

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“…Besides, as an alternative to conventional crystals, a periodically-poled-non-linear waveguide medium and CW laser may be employed, aiming at the production of inherently single-mode (frequency) non-degenerate PDC light. Extension to the tripartite case [49,50,51,52,53,54,55,56,57,58,59] is also in progress and results will be reported elsewhere.…”

Section: Conclusion and Outlooksmentioning

confidence: 99%

Monitoring the quantum-classical transition in thermally seeded parametric down-conversion by intensity measurements

et al. 2009

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Abstract. We address the pair of conjugated field modes obtained from parametricdownconversion as a convenient system to analyze the quantum-classical transition in the continuous variable regime. We explicitly evaluate intensity correlations, negativity and entanglement for the system in a thermal state and show that a hierarchy of nonclassicality thresholds naturally emerges in terms of thermal and downconversion photon number. We show that the transition from quantum to classical regime may be tuned by controlling the intensities of the seeds and detected by intensity measurements. Besides, we show that the thresholds are not affected by losses, which only modify the amount of nonclassicality. The multimode case is also analyzed in some detail.

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Section: Conclusion and Outlooksmentioning

confidence: 99%

Monitoring the quantum-classical transition in thermally seeded parametric down-conversion by intensity measurements

et al. 2009

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“…For quantum key distribution and continuous variable teleportation it has been shown that inseparable three-mode entanglement is useful [6]. This has been demonstrated in optical crystals using consecutive nonlinear optical interactions in resonance [6][7][8][9]. Recently it has been demonstrated, theoretically and experimentally, that three-color tripartite entanglement is possible in an optical parametric oscillator across a wide frequency range [10,11].…”

Section: Introductionmentioning

confidence: 96%

Quantum frequency translation by four-wave mixing in a fiber: low-conversion regime

Mejling¹,

McKinstrie²,

Raymer³

et al. 2012

Opt. Express

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Abstract:In this paper we consider frequency translation enabled by Bragg scattering, a four-wave mixing process. First we introduce the theoretical background of the Green function formalism and the Schmidt decomposition. Next the Green functions for the low-conversion regime are derived perturbatively in the frequency domain, using the methods developed for three-wave mixing, then transformed to the time domain. These results are also derived and verified using an alternative time-domain method, the results of which are more general. For the first time we include the effects of convecting pumps, a more realistic assumption, and show that separability and arbitrary reshaping is possible. This is confirmed numerically for Gaussian pumps as well as higher-order Hermite-Gaussian pumps.

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“…We note, however, that in the one-way quantum computing the complexity is shifted from the state control and manipulation to its generation: the different algorithms are realized simply through different measurements. In particular, recent developments in bulk optics [55][56][57][58][59][60], indicate that quantum frequency combs may represent a viable solution for one-way quantum computing. In light of this, our recent results on the generation of wavelength multiplexed photon pairs in microring resonators demonstrate that this is a venue that should be investigated in integrated platforms.…”

Section: Cross-polarized Photon Pair Generationmentioning

confidence: 99%

Multifrequency sources of quantum correlated photon pairs on-chip: a path toward integrated Quantum Frequency Combs

et al. 2016

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Recent developments in quantum photonics have initiated the process of bringing photonic-quantumbased systems out-of-the-lab and into real-world applications. As an example, devices to enable the exchange of a cryptographic key secured by the laws of quantum mechanics are already commercially available. In order to further boost this process, the next step is to transfer the results achieved by means of bulky and expensive setups into miniaturized and affordable devices. Integrated quantum photonics is exactly addressing this issue. In this paper, we briefly review the most recent advancements in the generation of quantum states of light on-chip. In particular, we focus on optical microcavities, as they can offer a solution to the problem of low efficiency that is characteristic of the materials typically used in integrated platforms. In addition, we show that specifically designed microcavities can also offer further advantages, such as compatibility with telecom standards (for exploiting existing fibre networks) and quantum memories (necessary to extend the communication distance), as well as giving a longitudinal multimode character for larger information transfer and processing. This last property (i.e., the increased dimensionality of the photon quantum state) is achieved through the ability to generate multiple photon pairs on a frequency comb, corresponding to the microcavity resonances. Further achievements include the possibility of fully exploiting the polarization degree of freedom, even for integrated devices. These results pave the way for the generation of integrated quantum frequency combs that, in turn, may find important applications toward the realization of a compact quantum-computing platform.

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Multipartite continuous-variable entanglement from concurrent nonlinearities

Cited by 122 publications

References 23 publications

Monitoring the quantum-classical transition in thermally seeded parametric down-conversion by intensity measurements

Monitoring the quantum-classical transition in thermally seeded parametric down-conversion by intensity measurements

Quantum frequency translation by four-wave mixing in a fiber: low-conversion regime

Multifrequency sources of quantum correlated photon pairs on-chip: a path toward integrated Quantum Frequency Combs

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