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

## TL;DR

This paper demonstrates a method for quantum state tomography of a single-photon state using photon-number-resolving measurements with transition-edge sensors, revealing the Wigner function's negativity without assumptions or corrections.

## Contribution

It introduces a state-independent tomography technique employing TES detectors, enabling direct observation of Wigner function negativity in raw data.

## Key findings

- Reconstructed Wigner quasiprobability distribution of a single-photon state.
- Observed negativity of the Wigner function directly from raw data.
- Achieved system efficiency of approximately 58%.

## Abstract

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.