63 citations · 310 across the 19 of their papers we have counts for
15 papers · 1 filter
Quantum communication networks with optical vortices
S. Suciu, G. A. Bulzan, T. A. Isdraila +4
Quantum communications bring a paradigm change in internet security by using quantum resources to establish secure keys between parties. Present-day quantum communications networks…
Optimal phase sensitivity of an unbalanced Mach-Zehnder interferometer
Karunesh K. Mishra, Stefan Ataman
In this paper we address the problem of optimizing an unbalanced Mach-Zehnder interferometer, for a given pure input state and considering a specific detection scheme. While the op…
Quantum Fisher information maximization in an unbalanced interferometer
Stefan Ataman
In this paper we provide the answer to the following question: given an arbitrary pure input state and a general, unbalanced, Mach-Zehnder interferometer, what transmission coeffic…
Interaction-free imaging of multi-pixel objects
Alexandra Maria Palici, Tudor-Alexandru Isdraila, Stefan Ataman +1
Quantum imaging, one of the pillars of quantum technologies, is well-suited to study sensitive samples which require low-light conditions, like biological tissues. In this context,…
Single- versus two-parameter Fisher information in quantum interferometry
Stefan Ataman
In this paper we reconsider the single parameter quantum Fisher information (QFI) and compare it with the two-parameter one. We find simple relations connecting the single paramete…
OAM tomography with Heisenberg-Weyl observables
Alexandra Maria Palici, Tudor-Alexandru Isdraila, Stefan Ataman +1
Photons carrying orbital angular momentum (OAM) are excellent qudits and are widely used in several applications, such as long distance quantum communication, -dimensional telep…
Optimal Mach-Zehnder phase sensitivity with Gaussian states
Stefan Ataman
We address in this work the phase sensitivity of a Mach-Zehnder interferometer with Gaussian input states. A squeezed-coherent plus squeezed vacuum input state allows us to unambig…
Phase sensitivity for an unbalanced interferometer without input phase-matching restrictions
Anca Preda, Stefan Ataman
The Cramér-Rao bound and the quantum Fisher information have been tools used extensively for interferometric phase sensitivity. Most scenarios considering a Mach-Zehnder interferom…
Phase sensitivity of a Mach-Zehnder interferometer with single-intensity and difference-intensity detection
Stefan Ataman, Anca Preda, Radu Ionicioiu
Interferometry is a widely-used technique for precision measurements in both classical and quantum contexts. One way to increase the precision of phase measurements, for example in…
Vacuum birefringence detection in all-optical scenarios
Stefan Ataman
In this paper we propose an all-optical vacuum birefringence experiment and evaluate its feasibility for various scenarios. Many petawatt-class lasers became operational and many m…
A novel delayed-choice experimental proposal testing local decisions
Stefan Ataman
Entangled states are notoriously non-separable, their sub-ensembles being only statistical mixtures yielding no coherences and no quantum interference phenomena. The interesting fe…
Spying on photons with photons: quantum interference and information
Stefan Ataman
The quest to have both which-path knowledge and interference fringes in a double-slit experiment dates back to the inception of quantum mechanics (QM) and to the famous Einstein-Bo…
An example of quantum imaging: rendering an object undetectable
Stefan Ataman
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…
The quantum optical description of a Fabry-Perot interferometer and the prediction of an antibunching effect
Stefan Ataman
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 depen…
Complementarity, quantum erasure and delayed choice with modified Mach-Zehnder interferometers
Stefan Ataman
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 seri…