Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversion

Abstract

We address the intrinsic multimode nature of the quantum state of light obtained by pulsed spontaneous parametric downconversion and develop a theoretical model based only on experimentally accessible quantities. We exploit the pairwise entanglement as a resource for conditional multimode measurements and derive closed formulas for the detection probability and the density matrix of the conditional states. We present a set of experiments performed to validate our model in different conditions that are in excellent agreement with experimental data. Finally, we evaluate nonGaussianity of the conditional states obtained from our source with the aim of discussing the effects of the different experimental parameters on the efficacy of this type of conditional state preparation.

References in corpus (46)

• On the impossibility of distilling Gaussian states with Gaussian operations
• Schroedinger cat-like states by conditional measurements on a beam-splitter
• Continuous-variable teleportation improvement by photon subtraction via conditional measurement
• Gaussian transformations and distillation of entangled Gaussian states
• Generation of Continuous Variable Einstein-Podolsky-Rosen Entanglement via the Kerr Nonlinearity in an Optical Fibre
• Increasing entanglement between Gaussian states by coherent photon subtraction
• Non-Gaussian entanglement distillation for continuous variables
• Teleportation improvement by inconclusive photon subtraction
• Pulsed squeezed light: simultaneous squeezing of multiple modes
• Quantifying the non-Gaussian character of a quantum state by quantum relative entropy
• Entanglement purification of Gaussian continuous variable quantum states
• Recent developments in photon-level operations on travelling light fields
• A measure of the non-Gaussian character of a quantum state
• Sub-shot-noise photon-number correlation in mesoscopic twin-beam of light
• Experimental entanglement distillation of mesoscopic quantum states
• The optimal cloning of quantum coherent states is non-Gaussian
• Optimised generation of heralded Fock states using parametric down conversion
• Coherent-state phase concentration by quantum probabilistic amplification
• Photon-added state preparation via conditional measurement on a beam splitter
• Bridging Visible and Telecom Wavelengths with a Single-Mode Broadband Photon Pair Source
• How Colors Influence Numbers: Photon Statistics of Parametric Downconversion
• Multimode theory of measurement-induced non-Gaussian operation on wideband squeezed light
• Optical Fock-state synthesizer
• Quantum and classical correlations of intense beams of light via joint photodetection
• Self-consistent characterization of light statistics
• Direct Measurement of the Spatial-Spectral Structure of Waveguided Parametric Down-Conversion
• Reliable source of conditional non-Gaussian states from single-mode thermal fields
• Squeezed Fock state by inconclusive photon subtraction
• Photon subtracted states and enhancement of nonlocality in the presence of noise
• Decomposing a pulsed optical parametric amplifier into independent squeezers
• Improving the entanglement transfer from continuous variable systems to localized qubits using non Gaussian states
• Optical qubit by conditional interferometry
• Effect of noise and enhancement of nonlocality in on/off photodetection
• Statistics of multiphoton events in spontaneous parametric down-conversion
• Photon-number correlations by photon-number resolving detectors
• Quantum state engineering assisted by entanglement
• Wigner function of pulsed fields by direct detection
• Highly non-Gaussian states created via cross-Kerr nonlinearity
• Enhancement of parameter estimation by Kerr interaction
• Non-Gaussian states produced by close-to-threshold optical parametric oscillators: role of classical and quantum fluctuations
• Verifying continuous variable entanglement of intense light pulses
• Conditional quantum-state transformation at a beam splitter
• Conditional preparation of states containing a definite number of photons
• Multi-mode states in decoy-based quantum key distribution protocols
• Quantum synthesis of arbitrary unitary operators
• Non-Gaussian states by conditional measurements

Cited by in corpus (15)

• Resource theory of quantum non-Gaussianity and Wigner negativity
• Quantifying non-Gaussianity for quantum information
• Measuring high-order photon-number correlations in multimode pulsed quantum states
• Quantum non-Gaussianity witnesses in the phase space
• Optimal sub-Poissonian light generation from twin beams by photon-number resolving detectors
• Characterizing the non-classicality of mesoscopic optical twin-beam states
• Measuring nonclassicality with Silicon photomultipliers
• Generating Hermite polynomial excited squeezed states by means of conditional measurements on a beam splitter
• Direct observation of the degree of quantum correlations using photon-number resolving detectors
• High-dimensional quantum encoding via photon-subtracted squeezed states
• Geometry of perturbed Gaussian states and quantum estimation
• Experimental quantification of non-Gaussianity of phase-randomized coherent states
• Hybrid discrimination strategy in quantum communication based on photon-number-resolving detectors and mesoscopic twin-beam states
• Non-Gaussian macroscopic entanglement of motion in a hybrid electromechanical device
• Effect of noisy channels on the transmission of mesoscopic twin-beam states