Negative Wigner function at telecommunication wavelength from homodyne detection

Abstract

Quantum states of light having a Wigner function with negative values represent a key resource in quantum communication and quantum information processing. Here, we present the generation of such a state at the telecommunication wavelength of 1550nm. The state is generated by means of photon subtraction from a weakly squeezed vacuum state and is heralded by the `click' of a single photon counter. Balanced homodyne detection is applied to reconstruct the Wigner function, also yielding the state's photon number distribution. The heralding photons are frequency up-converted to 532nm to allow for the use of a room-temperature (silicon) avalanche photo diode. The Wigner function reads W(0,0)=-0.063 +/- 0.004 at the origin of phase space, which certifies negativity with more than 15 standard deviations.

References in corpus (10)

• Detection of 15 dB Squeezed States of Light and their Application for the Absolute Calibration of Photoelectric Quantum Efficiency
• Generation of a superposition of odd photon number states for quantum information networks
• Instantaneous non-local computation of low T-depth quantum circuits
• Generation of Optical Coherent State Superpositions by Number-Resolved Photon Subtraction from Squeezed Vacuum
• High purity bright single photon source
• Optical synthesis of large-amplitude squeezed coherent-state superpositions with minimal resources
• Non-Gaussian states from continuous-wave Gaussian light sources
• A high-fidelity single-photon source based on a type-II optical parametric oscillator
• Local sampling of the Wigner function at telecom wavelength with loss-tolerant detection of photon statistics
• Unconditional entanglement interface for quantum networks

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• Generation of Highly Pure Single-Photon State at Telecommunication Wavelength
• Detector-Agnostic Phase-Space Distributions
• Optically-Sampled Superconducting-Nanostrip Photon-Number Resolving Detector for Non-Classical Quantum State Generation
• Accurate photonic temporal mode analysis with reduced resources