Pulsed source of spectrally uncorrelated and indistinguishable photons at telecom wavelengths

Abstract

We report on the generation of indistinguishable photon pairs at telecom wavelengths based on a type-II parametric down conversion process in a periodically poled potassium titanyl phosphate (PPKTP) crystal. The phase matching, pump laser characteristics and coupling geometry are optimised to obtain spectrally uncorrelated photons with high coupling efficiencies. Four photons are generated by a counter- propagating pump in the same crystal and anlysed via two photon interference experiments between photons from each pair source as well as joint spectral and g^(2) measurements. We obtain a spectral purity of 0.91 and coupling efficiencies around 90% for all four photons without any filtering. These pure indistinguishable photon sources at telecom wavelengths are perfectly adapted for quantum network demonstrations and other multi-photon protocols.

References in corpus (11)

• The Quantum Internet
• Heralded Generation of Ultrafast Single Photons in Pure Quantum States
• Entangling Independent Photons by Time Measurement
• Probing multimode squeezing with correlation functions
• Photonic crystal fibre source of photon pairs for quantum information processing
• Conditional preparation of single photons using parametric downconversion: A recipe for purity
• Bright source of spectrally uncorrelated polarization-entangled photons with nearly single-mode emission
• Widely tunable single photon source with high purity at telecom wavelength
• Optimal focusing for maximal collection of entangled narrow-band photon pairs into single-mode fibers
• High-fidelity entanglement swapping with fully independent sources
• On the Purity and Indistinguishability of Down-Converted Photons

Cited by in corpus (23)

• Quantum photonics at telecom wavelengths based on lithium niobate waveguides
• Highly efficient entanglement swapping and teleportation at telecom wavelength
• Highly efficient frequency conversion with bandwidth compression of quantum light
• Spectral Correlation Measurements at the Hong-Ou-Mandel Interference Dip
• Efficient generation and spectral characterization of spectrally factorable biphotons
• Extended Wiener-Khinchin theorem for quantum spectral analysis
• Simulating quantum repeater strategies for multiple satellites
• Quantum interferometers: principles and applications
• Enhanced heralded single-photon source with a photon-number-resolving parallel superconducting nanowire single-photon detector
• Quantum Interference between Autonomous Single-Photon Sources from Doppler-Broadened Atomic Ensemble
• Reducing detection noise of a photon pair in a dispersive medium by controlling its spectral entanglement
• Limits of the time-multiplexed photon-counting method
• Detection-dependent six-photon NOON state interference
• Measuring higher-order photon correlations of faint quantum light: a short review
• Numerical Investigation of Photon-Pair Generation in Periodically Poled MTiOXO4 (M = K, Rb, Cs; X = P, As)
• Spectrally pure states at telecommunications wavelengths from periodically poled $M$TiO$X$O${}_4$ ($M$ = K, Rb, Cs; $X$ = P, As) crystals
• Down-conversion processes in ab-initio non-relativistic quantum electrodynamics
• Monotonic quantum-to-classical transition enabled by positively-correlated biphotons
• Near-unity indistinguishability of single photons emitted from dissimilar and independent atomic quantum nodes
• Robust and bright polarization-entangled photon sources exploiting non-critical phase matching without periodic poling
• Experimentally Certified Transmission of a Quantum Message through an Untrusted and Lossy Quantum Channel via Bell's Theorem
• Optimized Spectral Purity of Heralded Single Photons at the Telecom O-Band
• Advancing the heralded photon-number-state characterization by understanding the interplay of experimental settings