State-independent quantum state tomography by photon-number-resolving measurements

Abstract

The Wigner quasiprobability distribution of a narrowband single-photon state\nwas reconstructed by quantum state tomography using photon-number-resolving\nmeasurements with transition-edge sensors (TES) at system efficiency 58(2)%.\nThis method makes no assumptions on the nature of the measured state, save for\nthe limitation on photon flux imposed by the TES. Negativity of the Wigner\nfunction was observed in the raw data without any inference or correction for\ndecoherence.\n