Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.11: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Generating N00N-like (macroscopic) quantum states — •Falk Töppel1,2, Maria V. Chekhova1,2, and Gerd Leuchs1,2 — 1Max Planck Institute for the Science of Light, Günther-Scharowsky-Straße 1/Bldg. 24, 91058 Erlangen, Germany — 2Institute for Optics, Information and Photonics, Universität Erlangen-Nürnberg, Staudtstraße 7/B2, 91058 Erlangen, Germany
We demonstrate the potential of a recently proposed protocol for conditional state preparation to generate new and interesting two-mode (macroscopic) quantum states. Our protocol allows one to manipulate the photon number distribution of a two-mode (macroscopic) quantum states of light such that contributions with similar photon numbers in both modes are suppressed. The key feature of the protocol is that quantum entanglement shared between the two modes is preserved.
Let us consider the superposition of a coherent state and a squeezed vacuum state at a 50/50 beam splitter. This quantum state is known to resemble a N00N state with fidelity > 90% when post-selecting on a certain total photon number, although its photon number distribution is very different from the one of a N00N state. We can enhance the N00N-like contributions of the considered state with the above mentioned protocol. The filtered state exhibits super-resolution when post-selecting on a fixed total number of photons, just as it is known for the considered input state. This indicates that superposition terms are not destroyed by the protocol. We examine entanglement properties of the new quantum state and study its potential to violate Bell's inequality.