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Le Touquet - Paris-Plage, France

Ataman S.,ECE Paris Graduate School of Engineering
European Physical Journal D | Year: 2014

In this paper we describe a novel, graphical method, allowing the fast computation of field operator transformations for linear lossless optical devices in quantum optics (QO). The advantage of this method grows with the complexity of the considered optical setup. As case studies we examine the field operator transformations for the beam splitter (BS), the Mach-Zehnder interferometer (MZI) and the double MZI. We consider the simple case with monochromatic input light, as well as extensions to the non-monochromatic case. © EDP Sciences, Società Italiana di Fisica, Springer-Verlag.


Ataman S.,ECE Paris Graduate School of Engineering
European Physical Journal D | Year: 2014

Often cited dictums in Quantum Mechanics include observation disturbance causes loss of interference and ignorance is interference. In this paper we propose and describe a series of experiments with modified Mach-Zehnder interferometers showing that one has to be careful when applying such dictums. We are able to show that without interacting in any way with the light quantum (or quanta) expected to behave wave-like, interference fringes can be lost by simply gaining (or having the potential to gain) the which-path knowledge. Erasing this information may revive the interference fringes. Delayed choice can be added, arriving to an experiment in line with Wheeler's original proposal. We also show that ignorance is not always synonym with having the interference fringes. The often-invoked collapse of the wavefunction is found to be a non-necessary ingredient to describe our experiments. © EDP Sciences, Società Italiana di Fisica, Springer-Verlag.


Ataman S.,ECE Paris Graduate School of Engineering
European Physical Journal D | Year: 2015

In this paper we describe and thoroughly discuss three reported experiments in quantum optics (QO) involving interferometers and non-linear crystals. We show that by using a graphical method and an over-simplified model of the parametric down-conversion process, we arrive to explain all the important results reported in the respective papers. Indistinguishability is discussed in the case of separable/non-separable (i.e. entangled) quantum systems and our interpretation is sometimes at variance with the one given by the authors reporting the experiments. © 2015 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.


Ataman S.,ECE Paris Graduate School of Engineering
European Physical Journal D | Year: 2015

Abstract In this paper we describe a Fabry-Perot interferometer in the language of quantum optics. We go on to model the Fabry-Perot interferometer as a beam splitter having frequency dependent transmissivity and reflectivity coefficients. The antibunching, a totally non-classical effect, is to be expected if one excites this interferometer with carefully frequency-selected single photons arriving simultaneously from opposite directions. For carefully chosen frequencies, even slightly different color single photons should be able to show this effect, as long as the photon counters are not frequency selective. Graphical abstract: [Figure not available: see fulltext.] © 2015 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.


Ataman S.,Extreme Light Infrastructure Nuclear Physics ELI NP | Ataman S.,ECE Paris Graduate School of Engineering
European Physical Journal D | Year: 2016

Abstract: In this paper we propose and analyse a Gedankenexperiment involving three non-linear crystals and two objects inserted in the idler beams. We show that, besides the behaviour that can be extrapolated from previous experiments involving two crystals and one object, we are able to predict a new effect: under certain circumstances, one of the objects can be rendered undetectable to any single detection rate on the signal photons with discarded idler photons. This effect could find applications in future developments of quantum imaging techniques. Graphical abstract: [Figure not available: see fulltext.] © 2016, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.

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