Characterization of Spectral Entanglement of Spontaneous Parametric-Down Conversion Biphotons

Abstract

We verified operational approach based on direct measurement of entanglement degree for bipartite systems. In particular spectral distributions of single counts and coincidence for pure biphoton states generated by train of short pump pulses have been measured and entanglement quantifier calculated. The approach gives upper bound of entanglement stored in total biphoton states, which can reach extremely high value up to $10^4-10^5$.

References in corpus (10)

• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• Quantum state reconstruction of the single-photon Fock state
• Research on Hidden Variable Theories: a review of recent progresses
• Tomographic reconstruction of the single-photon Fock state by high-frequency homodyne detection
• Shaping the waveform of entangled photons
• Anisotropically high entanglement of biphotons generated in spontaneous parametric down conversion
• Two-Photon Polarization Interference for Pulsed SPDC in a PPKTP Waveguide
• State reconstruction by on/off measurements
• Dispersion spreading of biphotons in optical fibres and two-photon interference
• Control, measurement and propagation of entanglement in photon pairs generated through type-II parametric downconversion

Cited by in corpus (28)

• Advances in High Dimensional Quantum Entanglement
• Large-Alphabet Time-Frequency Entangled Quantum Key Distribution by means of Time-to-Frequency Conversion
• Microscale generation of entangled photons without momentum conservation
• Experimental estimation of entanglement at the quantum limit
• Generation and distribution of high-dimensional frequency-entangled qudits
• Transverse Entanglement of Biphotons
• Spatio-spectral characteristics of parametric down-conversion in waveguide arrays
• Versatile shaper-assisted discretization of energy-time entangled photons
• Broadband bright twin beams and their up-conversion
• Generation of broadband spontaneous parametric fluorescence using multiple bulk nonlinear crystals
• Optimal estimation of entanglement in optical qubit systems
• Entanglement Witnesses and Measures for Bright Squeezed Vacuum
• Broadband biphotons in a single spatial mode
• Broadband indistinguishability from bright parametric downconversion in a semiconductor waveguide
• Optimal estimation of entanglement and discord in two-qubit states
• Biphoton Spectrum Control
• Ring-shaped spectra of parametric down-conversion and entangled photons that never meet
• Broadly tunable photon pair generation in a suspended-core fiber
• Separable Schmidt modes of a non-separable state
• On the discrimination between classical and quantum states
• Uncovering dispersion properties in semiconductor waveguides to study photon-pair generation
• Testing Ultrafast Two-Photon Spectral Amplitudes via Optical Fibres
• Temporal interference effects in noncollinear and frequency-nondegenerate spontaneous parametric down-conversion
• Experimental observation of double-peak structure of coincidence spectra in ultra-fast Spontaneous Parametric Down Conversion
• A note on Schmidt-number witnesses based on symmetric measurements
• Tunable entanglement distillation of spatially correlated down-converted photons
• Advances in Position-Momentum Entanglement: A Versatile Tool for Quantum Technologies
• A theoretical study of nonclassical effects in optical and spin systems and their applications