Playing with photon subtraction

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We implemented a reliable scheme for single photon subtraction and tested its effects on paradigmatic light states: Fock, thermal, and coherent. When applied to coherent states, the annihilation operator does not modify the state itself. Experimentally verified that coherent states are eigenstates of the photon annihilation operator.

Cavity-enhanced generation of highly-nonclassical states

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We use a pulsed pump enhancement cavity to produce highly-nonclassical states of light at high repetition rates. The frequency comb structure of the pump laser may be transferred to the produced quantum light.

Best poster prize at the “Quantum & Nonlinear Optics” PhD Summer School

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Our PhD student Valentina Parigi wins the prize for the best poster presentation at the Quantum & Nonlinear Optics  –  Ph.D. Summer School, Backfallsbyn, Hven, DK

To the roots of non-classicality: First reconstruction of a non-classical Glauber-Sudarshan P-function

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We performed the first reconstruction of a non-classical P-function for a photon-added thermal light state. This is the first demonstration of non-classicality according to the original definition by R. Glauber.

Simple quasi-phase-matching in high-order harmonic generation

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We demonstrate a simple technique for enhancing harmonic conversion yields by an array of gas interaction zones.

Direct experimental test of quantum non-commutativity by single photon creation and annihilation

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We have implemented simple sequences of photon addition and subtraction to/from a light field. By verifying the difference in the final states when using the two operators in reverse order, we provide the first direct test of quantum commutation rules.

Single-photon remote temporal delocalization and violation of a Bell’s type inequality

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We have remotely delocalized a single photon onto two distinct and widely separated temporal modes. The tomographic analysis of the two-mode homodyne data has allowed us to prove (under some assumptions) the violation of a form of Bell’s inequality.

Direct interferometric measurement of atomic dipole phases in high-order harmonic generation

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We have used an interferometric technique to directly measure the intrinsic nonlinear phase related to the different electronic trajectories involved in high-order harmonic generation in the XUV.

The 2005 Nobel Prize in Physics awarded to Theodor W. Hansch

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Ted Hänsch and Marco Bellini performed one of the key experiments leading to the invention of the femtosecond frequency comb (and, later, to the Nobel prize) in Florence.

First experimental photon addition

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First realization of single-photon-added coherent states. We have generated and analyzed novel states of light that continuously change their character from fully quantum to fully classical.

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