State-independent quantum tomography of a single-photon state by photon-number-resolving measurements

Understand

The Wigner quasiprobability distribution of a narrowband single-photon state was reconstructed by quantum state tomography using photon-number-resolving measurements with transition-edge sensors (TES) at system efficiency 58(2)%.

• This method makes no assumptions on the nature of the measured state, save for the limitation on photon flux imposed by the TES.
• Negativity of the Wigner function was observed in the raw data without any inference or correction for decoherence.