Ana Predojevic, Miroslav Jezek, Tobias Huber, Harishankar Jayakumar, Thomas Kauten, Glenn S. Solomon, Radim Filip, Gregor Weihs
Quantum dots are single photon emitters. A single photon state is quantum mechanically represented by the Fock state, which is a quantum non-Gaussian state characterized by a Wigner function negative at the origin. Due to the low collection and detection efficiencies, the reconstruction of the Wigner function from measurements of the quantum dot emission would not confirm the non-Gaussian nature of the emitted light since the negativity of the Wigner function is lost for detection efficiencies below 50%. Semiconductor photon sources like quantum dots are commonly characterized as single photon sources through an auto-correlation measurement. In this work instead, we use a criterion based on an estimate of the photon-number distribution. Through our measurements we prove that the state emitted from a resonantly excited quantum dot is unambiguously a non-Gaussian state.
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http://arxiv.org/abs/1211.2993
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