Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Optics III
Q 20.4: Talk
Monday, March 5, 2018, 17:00–17:15, K 0.016
Non-classical states of light with smooth P-function — François Damanet1,2, •Jonas Kübler3, John Martin2, and Daniel Braun3 — 1Department of Physics and SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom — 2Institut de Physique Nucléaire, Atomique et de Spectroscopie, CESAM, Université de Liège, Bâtiment B15, B - 4000 Liége, Belgium — 3Institut für theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, 72076 Tübingen, Germany
In quantum optics, the most fundamental criterion to judge the nonclassicality
of a quantum state of light is in terms of the Glauber-
Sudarshan P-function. If the P-function of a state is not a valid probability
density, e.g. not a positive semi-definite function, the state is considered
non-classical. However, most known non-classical states have a corresponding
P-function which is highly irregular. This renders working
with them difficult and direct experimental reconstruction impossible.
Here we introduce a new class of non-classical states with
regular smooth P-functions by "puncturing" a classical P-function with
narrow negative peaks. We analytically proof their existence and
determine parameter ranges where the constructed states are physical,
as well as the regimes yielding anti-bunching of light. To conclude, we
present some possible experimental realizations of punctured states.