Continuous-variable entangled states of light carrying orbital angular momentum

@article{Pecoraro2019ContinuousvariableES,
  title={Continuous-variable entangled states of light carrying orbital angular momentum},
  author={Adriana Pecoraro and Filippo Cardano and Lorenzo Marrucci and Alberto Porzio},
  journal={Physical Review A},
  year={2019}
}
The orbital angular momentum of light, unlike spin, is an infinite-dimensional discrete variable and may hence offer enhanced performances for encoding, transmitting, and processing information in the quantum regime. Hitherto, this degree of freedom of light has been studied mainly in the context of quantum states with definite number of photons. On the other hand, field-quadrature continuous-variable quantum states of light allow implementing many important quantum protocols not accessible… 

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References

SHOWING 1-10 OF 49 REFERENCES

Continuous variable entanglement and squeezing of orbital angular momentum states.

We report the first experimental characterization of the first-order continuous variable orbital angular momentum states. Using a spatially nondegenerate optical parametric oscillator (OPO) we

Multi-photon entanglement in high dimensions

A three-photon entangled state with 3 × 3 × 2 dimensions of its orbital angular momentum is created by using two independent entangled photon pairs from two nonlinear crystals, enabling the

High-Dimensional Single-Photon Quantum Gates: Concepts and Experiments.

This work experimentally demonstrates a four-dimensional generalization of the Pauli X gate and all of its integer powers on single photons carrying orbital angular momentum, which forms the first complete set of high-dimensional quantum gates implemented experimentally.

Quantum characterization of bipartite Gaussian states

Gaussian bipartite states are basic tools for the realization of quantum information protocols with continuous variables. Their complete characterization is obtained by the reconstruction of the

Quantum teleportation with continuous variables: A survey

The concepts of quantum entanglement and teleportation in the CV framework are developed by analogy with the qubit-based approach by addressing the study of CV quantum teleportation networks where more users share a multipartite state and an arbitrary pair of them performs quantum teleportation.

Experimental characterization of continuous-variable entanglement

We present an experimental analysis of quadrature entanglement produced from a pair of amplitude squeezed beams. The correlation matrix of the state is characterized within a set of reasonable

Direct generation of a multi-transverse mode non-classical state of light.

It is shown that this device, which is an Optical Parametric Oscillator using a self-imaging cavity, produces a multimode quantum resource made of three squeezed transverse modes.

Survival of continuous variable entanglement over long distances

Any quantum system, in interacting with the external classical environment, slowly loses its quantumness and entanglement degrades. In this paper, we experimentally found that, even in the presence

Continuous-variable hyperentanglement in a parametric oscillator with orbital angular momentum.

The quantum stochastic equations for the multimode parametric interaction are derived and solved allowing for calculation of the quadrature noise spectra that characterize continuous-variable entanglement.

Quantum key distribution using gaussian-modulated coherent states

This work proposes and experimentally demonstrate a quantum key distribution protocol based on the transmission of gaussian-modulated coherent states and shot-noise-limited homodyne detection, which is in principle secure for any value of the line transmission, against gaussian individual attacks based on entanglement and quantum memories.