Non-Gaussian operation based on photon subtraction using a photon-number-resolving detector at a telecommunications wavelength

We have implemented non-Gaussian operation in pulsed squeezed vacuum at a telecommunications wavelength. A one- or two-photon-subtracted squeezed state was generated using a titanium superconducting transition-edge sensor to resolve the incident photon number. We observed dips in the reconstructed Wigner functions of the generated quantum states, which provides clear evidence that non-Gaussian operation has been realized.