Physical Review A

Robust stationary mechanical squeezing in a kicked quadratic optomechanical system

Author(s): M. Asjad, G. S. Agarwal, M. S. Kim, P. Tombesi, G. Di Giuseppe, and D. Vitali

We propose a scheme for the generation of a robust stationary squeezed state of a mechanical resonator in a quadratically coupled optomechanical system, driven by a pulsed laser. The intracavity photon number presents periodic intense peaks suddenly stiffening the effective harmonic potential felt b...

[Phys. Rev. A 89, 023849] Published Fri Feb 28, 2014

Isotropic vortex tangles in trapped atomic Bose-Einstein condensates via laser stirring

Author(s): A. J. Allen, N. G. Parker, N. P. Proukakis, and C. F. Barenghi

The generation of isotropic vortex configurations in trapped atomic Bose-Einstein condensates offers a platform to elucidate quantum turbulence on mesoscopic scales. We demonstrate that a laser-induced obstacle moving in a figure-8 path within the condensate provides a simple and effective means to ...

[Phys. Rev. A 89, 025602] Published Fri Feb 28, 2014

Role of proton dynamics in efficient photoionization of hydrocarbon molecules

Author(s): Xinhua Xie, Stefan Roither, Markus Schöffler, Huailiang Xu, Sergiy Bubin, Erik Lötstedt, Sonia Erattuphuza, Atsushi Iwasaki, Daniil Kartashov, Kálmán Varga, Gerhard G. Paulus, Andrius Baltuška, Kaoru Yamanouchi, and Markus Kitzler

We experimentally investigate the ionization mechanism behind the formation of remarkably high charge states observed in the laser-pulse-induced fragmentation of different hydrocarbon molecules by Roither et al. [Phys. Rev. Lett. 106, 163001 (2011)PRLTAO10.1103/PhysRevLett.106.163001], who suggested...

[Phys. Rev. A 89, 023429] Published Wed Feb 26, 2014

Spatiotemporal cleaning of a femtosecond laser pulse through interaction with counterpropagating filaments in air

Author(s): A. Jarnac, M. Durand, A. Houard, Y. Liu, B. Prade, M. Richardson, and A. Mysyrowicz

We demonstrate spatiotemporal cleaning of a femtosecond laser pulse impinging on two counterpropagating filaments in air. The retroreflected signal essentially has a perfect beam profile. Prepulses present in the incident pulse are also efficiently removed. The performance of the “filament mirror” i...

[Phys. Rev. A 89, 023844] Published Wed Feb 26, 2014

Low-light-level four-wave mixing by quantum interference

Author(s): Chang-Kai Chiu, Yi-Hsin Chen, Yen-Chun Chen, Ite A. Yu, Ying-Cheng Chen, and Yong-Fan Chen

We observed electromagnetically induced transparency-based four-wave mixing (FWM) in the pulsed regime at low light levels. The FWM conversion efficiency of 3.8(9)% was observed in a four-level system of cold 87Rb atoms using a driving laser pulse with a peak intensity of ≈80 μW/cm2, corresponding t...

[Phys. Rev. A 89, 023839] Published Mon Feb 24, 2014

Characterizing high-n quasi-one-dimensional strontium Rydberg atoms

Author(s): M. Hiller, S. Yoshida, J. Burgdörfer, S. Ye, X. Zhang, and F. B. Dunning

The production of high-n, n∼300, quasi-one-dimensional (quasi-1D) strontium Rydberg atoms through two-photon excitation of selected extreme Stark states in the presence of a weak dc field is examined using a crossed laser-atom beam geometry. The dipolar polarization of the electron wave function in ...

[Phys. Rev. A 89, 023426] Published Fri Feb 21, 2014

Terahertz laser based on dipolaritons

Author(s): K. Kristinsson, O. Kyriienko, and I. A. Shelykh

We develop the microscopic theory of a terahertz (THz) laser based on the effects of resonant tunneling in a double quantum well heterostructure embedded in both optical and THz cavities. In the strong-coupling regime the system hosts dipolaritons, hybrid quasiparticles formed by the direct exciton,...

[Phys. Rev. A 89, 023836] Published Fri Feb 21, 2014

Creating a tunable spin squeezing via a time-dependent collective atom-photon coupling

Author(s): Lixian Yu, Jingtao Fan, Shiqun Zhu, Gang Chen, Suotang Jia, and Franco Nori

We present an experimentally feasible method to produce a large and tunable spin squeezing when an ensemble of many four-level atoms interacts simultaneously with a single-mode photon and classical driving lasers. Our approach is to simply introduce a time-dependent collective atom-photon coupling. ...

[Phys. Rev. A 89, 023838] Published Fri Feb 21, 2014

Einstein-Podolsky-Rosen paradox and quantum steering in a three-mode optomechanical system

Author(s): Qiongyi He and Zbigniew Ficek

We study multipartite entanglement, the generation of Einstein-Podolsky-Rosen (EPR) states, and quantum steering in a three-mode optomechanical system composed of an atomic ensemble located inside a single-mode cavity with a movable mirror. The cavity mode is driven by a short laser pulse, has a non...

[Phys. Rev. A 89, 022332] Published Thu Feb 20, 2014

Quantum-path control and isolated-attosecond-pulse generation using H2+ molecules with moving nuclei in few-cycle laser pulses

Author(s): Xin-Lei Ge, Tian Wang, Jing Guo, and Xue-Shen Liu

We theoretically investigate the high-order harmonic generation (HHG) and isolated-attosecond-pulse generation from a full one-dimensional (1D) model of H2+ molecule in 3-fs, 800-nm laser pulses by using numerical solutions of the non-Born-Oppenheimer time-dependent Schrödinger equation (TDSE). The ...

[Phys. Rev. A 89, 023424] Published Thu Feb 20, 2014

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