Gorelov, Vitaly Reining, Lucia Feneberg, Martin Goldhahn, Rüdiger Schleife, André Lambrecht, Walter R. L. Gatti, Matteo

The simplest picture of excitons in materials with atomic-like localization of electrons is that of Frenkel excitons, where electrons and holes stay close together, which is associated with a large binding energy. Here, using the example of the layered oxide V$_2$O$_5$ , we show how localized charge-transfer excitations combine to form excitons tha...

Grasset, Romain Katsumi, Kota Massat, Pierre Wen, Hai-Hu Chen, Xian-Hui Gallais, Yann Shimano, Ryo
Published in
npj Quantum Materials

We investigate the collective mode response of the iron-based superconductor Ba1−xKxFe2As2 using intense terahertz (THz) light. In the superconducting state a THz Kerr signal is observed and assigned to nonlinear THz coupling to superconducting degrees of freedom. The polarization dependence of the THz Kerr signal is remarkably sensitive to the coe...

Sellapillay, Kevissen Arrighi, Pablo Di Molfetta, Giuseppe
Published in
Scientific Reports

We build a quantum cellular automaton (QCA) which coincides with 1+1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$1+1$$\end{document} QED on its known continuum limit...

Chardonnet, Kostia Valiron, Benoît Vilmart, Renaud

ZX-Calculus is a versatile graphical language for quantum computation equipped with an equational theory. Getting inspiration from Geometry of Interaction, in this paper we propose a token-machine-based asynchronous model of both pure ZX-Calculus and its extension to mixed processes. We also show how to connect this new semantics to the usual stand...

Espinosa-Portalés, Llorenç Vennin, Vincent
Published in
Journal of Cosmology and Astroparticle Physics

Bell-inequality violations reveal the presence of quantum correlations between two particles that have interacted and then separated. Their generalisation to quantum fields is necessary to study a number of field-theoretic setups, such as cosmological density fluctuations. In this work, we show how Bell operators can be constructed for quantum fiel...

Edlbauer, Hermann Wang, Junliang Crozes, Thierry Perrier, Pierre Ouacel, Seddik Geffroy, Clément Georgiou, Giorgos Chatzikyriakou, Eleni Lacerda-Santos, Antonio Waintal, Xavier
...

The progress of charge manipulation in semiconductor-based nanoscale devices opened up a novel route to realise a flying qubit with a single electron. In the present review, we introduce the concept of these electron flying qubits, discuss their most promising realisations and show how numerical simulations are applicable to accelerate experimental...

Bunin, Guy Foini, Laura Kurchan, Jorge

The spectral form factor of quantum chaotic systems has the familiar `ramp$+$plateau' form, on top of which there are very strong fluctuations. Considered as the modulus of the partition function in complex temperature $\beta=\beta_R+i\tau=\beta_R+i\beta_I$, the form factor has regions of Fisher zeroes, the analogue of Yang-Lee zeroes for the compl...

Moutinho, João P. Pezzutto, Marco Pratapsi, Sagar Ferreira da Silva, Francisco de Franceschi, Silvano Bose, Sougato Costa, António T. Omar, Yasser

We present a proposal for a one-bit full-adder to process classical information based on the quantum reversible dynamics of a triple quantum dot system. The device works via the repeated execution of a Fredkin gate implemented through the dynamics of a single time-independent Hamiltonian. Our proposal uses realistic parameter values and could be im...

Jin, Tony Ferreira, João Bauer, Michel Filippone, Michele Giamarchi, Thierry

We devise a semi-classical model to describe the transport properties of low-dimensional fermionic lattices under the influence of external quantum stochastic noise. These systems behave as quantum stochastic resistors, where the bulk particle transport is diffusive and obeys the Ohm/Fick's law. Here, we extend previous exact studies beyond the one...

Haessler, S. Fabre, B. Higuet, J. Caillat, J. Ruchon, T. Breger, P. Carré, B. Constant, E. Maquet, A. Mével, E.
...

We photoionize nitrogen molecules with a train of extreme ultraviolet attosecond pulses together with a weak infrared field. We measure the phase of the two-color two-photon ionization transition (molecular phase) for different states of the ion. We observe a 0.76 $\pi$ shift for the electrons produced in the ionization channels leading to the X$^2...