Generation of Highly Pure Single-Photon State at Telecommunication Wavelength

Abstract

Telecommunication wavelength with well-developed optical communication technologies and low losses in the waveguide are advantageous for quantum applications. However, an experimental generation of non-classical states called non-Gaussian states at the telecommunication wavelength is still underdeveloped. Here, we generate highly-pure-single-photon states, one of the most primitive non-Gaussian states, by using a heralding scheme with an optical parametric oscillator and a superconducting nano-strip photon detector. The Wigner negativity, the indicator of non-classicality, of the generated single photon state is $-0.228\pm 0.004$, corresponded to $85.1\pm 0.7\%$ of single photon and the best record of the minimum value at all wavelengths. The quantum-optics-technology we establish can be easily applied to the generation of various types of quantum states, opening up the possibility of continuous-variable-quantum-information processing at telecommunication wavelengths.

10 pages, 6 figures

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• Real-time observation of picosecond-timescale optical quantum entanglement toward ultrafast quantum information processing
• Hierarchical Verification of Non-Gaussian Coherence in Bosonic Quantum States
• Generation of multi-photon Fock states at telecommunication wavelength using picosecond pulsed light
• Programmable time-multiplexed squeezed light source
• Sequential and Programmable Squeezing Gates for Optical Non-Gaussian Input States
• Certification of stellar ranks of quantum states of light with a pair of click detectors
• Simplified scheme for continuous-variable entanglement distillation: multicopy distillation of Gaussian entanglement without heralding Gaussian measurements
• Scalable Optical Quantum State Synthesizer with Dual-Mode Resonator Memory