Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 15: Quanteneffekte: Verschränkung und Dekohärenz 1

Q 15.3: Vortrag

Montag, 12. März 2012, 17:00–17:15, V7.01

Bright entangled state of light — •Timur Iskhakov1, Maria Chekhova1,2, and Gerd Leuchs11Max-Planck Institute for the Science of Light Guenther-Scharowsky-Str. 1 / Bau 24, Erlangen D-91058, Germany — 2Physics Department, M.V.Lomonosov Moscow State University, Leninskiye Gory 1-2, Moscow 119991, Russia

Our work is devoted to the generation and the analysis of the quantum properties of a macroscopic entangled state of light. In fact this is the bright analog of the two-photon singlet Bell state, which was theoretically proposed in [1]. At the stage of preparation this state is pure and can be described by the same Hamiltonian as its two-phonon predecessor but with stronger pumping. In literature, this state is known as ’polarization scalar light’, as it is absolutely non-polarized and its intensity and all the intensity moments are invariant to arbitrary polarization transformations or a state that is free of polarization noise (the noise of all Stokes observables is simultaneously suppressed below the shot noise level). It is the second property that allows the state to violate the separability criterion formulated in [2]. In the experiment this macroscopic state (105 photons per pulse) was produced by quantum interference of two orthogonally polarized bright two-color squeezed vacuums and was analyzed in a standard Stokes measurement setup. Although the inevitable optical losses did not allow us to observe the absolute noise suppression of the Stokes observables the degree of noise suppression was sufficient to demonstrate that the state is not separable.

[1] V. P. Karassiov, J. Phys. A 26, 4345 (1993).

[2] Ch. Simon and D. Bouwmeester, Phys. Rev. Lett. 91, 053601 (2003).

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