QUROPE Quantum Information Processing and Communication in Europe

Author(s): F. Fratini, L. Safari, P. Amaro, and J. P. Santos

We developed a method to calculate two-photon processes in quantum mechanics that replaces the infinite summation over the intermediate states by a perturbation expansion. This latter consists of a series of commutators that involve position, momentum, and Hamiltonian quantum operators. We analyzed ...

[Phys. Rev. A 97, 043842] Published Wed Apr 18, 2018

Author(s): L. Clark, H. G. Brown, D. M. Paganin, M. J. Morgan, T. Matsumoto, N. Shibata, T. C. Petersen, and S. D. Findlay

The rigid-intensity-shift model of differential-phase-contrast imaging assumes that the phase gradient imposed on the transmitted probe by the sample causes the diffraction pattern intensity to shift rigidly by an amount proportional to that phase gradient. This behavior is seldom realized exactly i...

[Phys. Rev. A 97, 043843] Published Wed Apr 18, 2018

Author(s): Nicolai B. Grosse, Philipp Franz, Jan Heckmann, Karsten Pufahl, and Ulrike Woggon

Optical media endowed with large nonlinear susceptibilities are highly prized for their employment in frequency conversion and the generation of nonclassical states of light. Although the presence of an optical resonance can greatly increase the nonlinear response (e.g., in epsilon-near-zero materia...

[Phys. Rev. A 97, 043844] Published Wed Apr 18, 2018

Author(s): C. E. Máximo, R. Bachelard, and R. Kaiser

Dielectric spheres moving in a dissipative medium are subjected to the effects of optical binding, i.e., a net force resulting from the collective scattering of light. Optical binding is now shown to exist with frictionless cold atoms, bringing as an additional feature the existence of rotating bound states.

[Phys. Rev. A 97, 043845] Published Wed Apr 18, 2018

Author(s): Katarzyna Krupa, Alessandro Tonello, Vincent Couderc, Alain Barthélémy, Guy Millot, Daniele Modotto, and Stefan Wabnitz

We experimentally demonstrate simultaneous spatial and temporal compression in the propagation of light pulses in multimode nonlinear optical fibers. We reveal that the spatial beam self-cleaning recently discovered in graded-index multimode fibers is accompanied by significant temporal reshaping an...

[Phys. Rev. A 97, 043836] Published Tue Apr 17, 2018

Author(s): Sumanta Das, Vincent E. Elfving, Florentin Reiter, and Anders S. Sørensen

We introduce a formalism to solve the problem of photon scattering from a system of multilevel quantum emitters. Our approach provides a direct solution of the scattering dynamics. As such the formalism gives the scattered fields' amplitudes in the limit of a weak incident intensity. Our formalism i...

[Phys. Rev. A 97, 043837] Published Tue Apr 17, 2018

Author(s): Sumanta Das, Vincent E. Elfving, Florentin Reiter, and Anders S. Sørensen

In a preceding paper we introduced a formalism to study the scattering of low-intensity fields from a system of multilevel emitters embedded in a three-dimensional (3D) dielectric medium. Here we show how this photon-scattering relation can be used to analyze the scattering of single photons and wea...

[Phys. Rev. A 97, 043838] Published Tue Apr 17, 2018

Author(s): Sarah M. Skoff, David Papencordt, Hardy Schauffert, Bernhard C. Bayer, and Arno Rauschenbeutel

Optical interfaces for quantum emitters are a prerequisite for implementing quantum networks. Here, we couple single molecules to the guided modes of an optical nanofiber. The molecules are embedded within a crystal that provides photostability and, due to the inhomogeneous broadening, a means to sp...

[Phys. Rev. A 97, 043839] Published Tue Apr 17, 2018

Author(s): D. A. Smirnova, V. M. Travin, K. Y. Bliokh, and F. Nori

Laboratory optics, typically dealing with monochromatic light beams in a single reference frame, exhibits numerous spin-orbit interaction phenomena due to the coupling between the spin and orbital degrees of freedom of light. Similar phenomena appear for electrons and other spinning particles. Here ...

[Phys. Rev. A 97, 043840] Published Tue Apr 17, 2018

Author(s): Xi-Wang Luo, Chuanwei Zhang, Guang-Can Guo, and Zheng-Wei Zhou

The large number of available orbital-angular-momentum (OAM) states of photons provides a unique resource for many important applications in quantum information and optical communications. However, conventional OAM switching devices usually rely on precise parameter control and are limited by slow s...

[Phys. Rev. A 97, 043841] Published Tue Apr 17, 2018

Author(s): Raghwinder Singh Grewal, S. Pustelny, A. Rybak, and M. Florkowski

We analyze nonlinear magneto-optical rotation (NMOR) in rubidium vapor subjected to a continuously scanned magnetic field. By varying the magnetic-field sweep rate, a transition from traditionally observed dispersivelike NMOR signals (low sweep rate) to oscillating signals (higher sweep rates) is de...

[Phys. Rev. A 97, 043832] Published Mon Apr 16, 2018

Author(s): A. Metelmann and H. E. Türeci

As superconductor quantum technologies are moving towards large-scale integrated circuits, a robust and flexible approach to routing photons at the quantum level becomes a critical problem. Active circuits, which contain parametrically driven elements selectively embedded in the circuit, offer a via...

[Phys. Rev. A 97, 043833] Published Mon Apr 16, 2018

Author(s): Yin-Chung Chen, Indronil Ghosh, André Schleife, P. Scott Carney, and Gaurav Bahl

Optical refrigeration of solids holds tremendous promise for applications in thermal management. It can be achieved through multiple mechanisms including inelastic anti-Stokes Brillouin and Raman scattering. However, engineering of these mechanisms remains relatively unexplored. The major challenge ...

[Phys. Rev. A 97, 043835] Published Mon Apr 16, 2018

Author(s): Yahong Chen, Andreas Norrman, Sergey A. Ponomarenko, and Ari T. Friberg

We introduce a class of structured polychromatic surface electromagnetic fields, reminiscent of conventional optical axicon fields, through a judicious superposition of partially correlated surface plasmon polaritons. We show that such partially coherent axiconic surface plasmon polariton fields are...

[Phys. Rev. A 97, 041801(R)] Published Fri Apr 13, 2018

Author(s): Nicholas Furtak-Wells, Lewis A. Clark, Robert Purdy, and Almut Beige

This paper models light scattering through flat surfaces with finite transmission, reflection, and absorption rates, with wave packets approaching the mirror from both sides. While using the same notion of photons as in free space, our model also accounts for the presence of mirror images and the po...

[Phys. Rev. A 97, 043827] Published Fri Apr 13, 2018

Author(s): Lijun Yuan and Ya Yan Lu

Bound states in the continuum (BICs) are trapped or guided modes with their frequencies in the frequency intervals of the radiation modes. On periodic structures, a BIC is surrounded by a family of resonant modes with their quality factors approaching infinity. Typically the quality factors are prop...

[Phys. Rev. A 97, 043828] Published Fri Apr 13, 2018

Author(s): J. J. Pigeon, S. Ya. Tochitsky, E. C. Welch, and C. Joshi

We present measurements of the third-order optical nonlinearity of Kr, Xe, N2, O2, and air at a wavelength near 10 µm by using four-wave mixing of ∼15−GW/cm2, 200-ps (full width at half maximum) CO2 laser pulses. Measurements in molecular gases resulted in an asymmetric four-wave mixing spectrum ind...

[Phys. Rev. A 97, 043829] Published Fri Apr 13, 2018

Author(s): Shengli Zhang and Xiangdong Zhang

Photon catalysis is an intriguing quantum mechanical operation during which no photon is added to or subtracted from the relevant optical system. However, we prove that photon catalysis is in essence equivalent to the simpler but more efficient noiseless linear amplifier. This provides a simple and ...

[Phys. Rev. A 97, 043830] Published Fri Apr 13, 2018

Author(s): A. González-Tudela and J. I. Cirac

In this work we study the quantum dynamics emerging when quantum emitters exchange excitations with a two-dimensional bosonic bath with a Dirac cone dispersion. We show that a single quantum emitter spectrally tuned in the vicinity of the Dirac point relaxes following a logarithmic law in time. More...

[Phys. Rev. A 97, 043831] Published Fri Apr 13, 2018

Author(s): Qi Zhang, Zhengyang Bai, and Guoxiang Huang

We investigate the transient optical response property of an electromagnetically induced transparency (EIT) in a cold Rydberg atomic gas. We show that both the transient behavior and the steady-state EIT spectrum of the system depend strongly on Rydberg interaction. Especially, the response speed of...

[Phys. Rev. A 97, 043821] Published Thu Apr 12, 2018