Cavity Field Reconstruction at Finite Temperature

We present a scheme to reconstruct the quantum state of a field prepared inside a lossy cavity at finite temperature. Quantum coherences are normally destroyed by the interaction with an environment, but we show that it is possible to recover complete information about the initial state (before interaction with its environment), making possible to reconstruct any $s$-parametrized quasiprobability distribution, in particular, the Wigner function.

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