Continuous-Variable Entangled States of Light carrying Orbital Angular Momentum
arXiv:1805.05105 · doi:10.1103/PhysRevA.100.012321
Abstract
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 with photon-number states. Here, we present the first generation and complete experimental characterization of a bipartite continuous-variable Gaussian entangled state endowed with non-zero orbital angular momentum. A q-plate is used to transfer the continuous-variable entanglement initially generated in polarization into orbital angular momentum. We then apply a reconfigurable homodyne detector to various combinations of orbital angular momentum modes in order to reconstruct the entire quantum-state covariance matrix, by directly measuring the fluctuations of quadrature operators. Our work is a step towards generating multipartite continuous-variable entanglement in a single optical beam.
arXiv commentTo appear in Phys. Rev. A
References in corpus (31)
- Separability Criterion for Density Matrices
- Peres-Horodecki separability criterion for continuous variable systems
- Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
- Inseparability criterion for continuous variable systems
- Continuous variable quantum cryptography using coherent states
- Quantum key distribution using gaussian-modulated coherent states
- Electromagnetic Angular Momentum
- Electromagnetic Force and Momentum
- Separability criterion and inseparable mixed states with positive partial transposition
- Twisted Photons: New Quantum Perspectives in High Dimensions
- Ultra-Large-Scale Continuous-Variable Cluster States Multiplexed in the Time Domain
- Wavelength-Multiplexed Quantum Networks with Ultrafast Frequency Combs
- Experimental realization of multipartite entanglement of 60 modes of a quantum optical frequency comb
- Quantum optics in the phase space - A tutorial on Gaussian states
- Multi-photon entanglement in high dimensions
- Experimental generation of four-mode continuous-variable cluster states
- High-Dimensional Single-Photon Quantum Gates: Concepts and Experiments
- Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation
- Photon spin-to-orbital angular momentum conversion via an electrically tunable -plate
- Full characterization of Gaussian bipartite entangled states by a single homodyne detector
- Continuous Variable Entanglement and Squeezing of Orbital Angular Momentum States
- Quantum Teleportation with Continuous Variables: a survey
- A characterization of continuous variable entanglement
- Quantum characterization of bipartite Gaussian states
- Experimental analysis of decoherence of quantumness in a continuous variables bi-partite entangled system
- An effective method to estimate multidimensional Gaussian states
- Characterization of bipartite states using a single homodyne detector
- Non-Gaussian states produced by close-to-threshold optical parametric oscillators: role of classical and quantum fluctuations
- Direct generation of a multi-transverse mode non-classical state of light
- About the probability distribution of a quantity with given mean and variance
- Experimental pre-assessing entanglement in Gaussian states mixing