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Physics

Atomic / Molecular / Quantum

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Displaying 376 - 400 of 1133

Detection and manipulation of the transverse motion in a Stark decelerator

July 17, 2021
Author(s)
Piotr Wcislo, Hao Wu, David Reens, Alexander Aeppli, Jun Ye
By enabling precise control over longitudinal velocity, Stark deceleration has become an important tool for studying cold collisions. However, the information about transverse motion is often hard to extract and to some extent beyond control. Here we

Dynamic Crossover in Fluids: From Hard Spheres to Molecules

July 7, 2021
Author(s)
Ian Bell, Stephanie Delage-Santacreu, Hai Hoang, Guillaume Galliero
We propose a simple and generic definition of a demarcation reconciling structural and dynamic frameworks when combined with the entropy scaling framework. This crossover line between gas- and liquid-like behaviors is defined as the curve for which an

Dissipative preparation of W states in trapped ion systems

July 2, 2021
Author(s)
Daniel Cole, Jenny Wu, Stephen Erickson, Panyu Hou, Andrew C. Wilson, Dietrich Leibfried, Florentin Reiter
We present protocols for dissipative entanglement of three trapped-ion qubits, and we discuss in detail a scheme that uses sympathetic cooling as the dissipation mechanism. This scheme relies on tailored destructive interference to generate one of six

Dipole-Dipole Frequency Shifts in Multilevel Atoms

June 30, 2021
Author(s)
Andre Cidrim, Asier Pineiro Orioli, Christian Sanner, Ross B. Hutson, Jun Ye, Romain Bachelard, Ana Maria Rey
Dipole-dipole interactions lead to frequency shifts which are expected to limit the performance of next generation atomic clocks. In this work, we compute dipolar frequency shifts accounting for the intrinsic atomic multilevel structure in standard Ramsey

Machine-learning enhanced dark soliton detection in Bose-Einstein condensates

June 15, 2021
Author(s)
Shangjie Guo, Amilson R. Fritsch, Ian Spielman, Justyna Zwolak
Most data in cold-atom experiments comes from images, the analysis of which is limited by our preconceptions of the patterns that could be present in the data. We focus on the well-defined case of detecting dark solitons—appearing as local density

Coupling an epitaxial quantum dot to a fiber-based external-mirror microcavity

June 3, 2021
Author(s)
Andreas Muller, Edward B. Flagg, Michael Metcalfe, John R. Lawall, Glenn S. Solomon
We report the coupling of individual InAs quantum dots (QDs) to a single mode of an external-mirror optical microcavity. The external mirror is bonded to a fiber and positioned above a semiconductor sample consisting of a QD-containing GaAs layer grown

Heterodyne measurement of resonant elastic scattering from epitaxial quantum dots

June 3, 2021
Author(s)
Michael Metcalfe, Glenn S. Solomon, John Lawall
Resonant elastic scattering from InAs quantum dots (QDs) is studied by heterodyne spectroscopy. We show theoretically that heterodyne spectroscopy of a two-level quantum emitter is not sensitive to the inelastic fluorescence component. In practice, we

Photonic quantum simulations of SSH-type topological insulators with perfect state transfer

June 3, 2021
Author(s)
Thomas Gerrits, Sae Woo Nam, Adriana Lita, M. Stobinska, T Sturges, A. Buraczewski, W.R. Clements, Jelmer J. Renema, Ian Walmsley
Topological insulators could profoundly impact the fields of spintronics, quantum computing and low-power electronics. To enable investigations of these non-trivial phases of matter beyond the reach of present-day experiments, quantum simulations provide

A Multi-Center Quadrature Scheme for the Molecular Continuum

June 1, 2021
Author(s)
Barry I. Schneider, Heman Gharibnejad, nicholas douguet, Luca Argenti, Jeppe Olsen
A common way to evaluate electronic integrals for polyatomic molecules is to use Becke's partitioning scheme [\colorblue}J. Chem. Phys. \bf 88}, 2547 (1988)}] in conjunction with multi- center grids of comparable size. Becke's scheme, however, is efficient

Purcell-enhanced single photon source based on a deterministically placed WSe2 monolayer quantum dot in a circular Bragg grating cavity

May 28, 2021
Author(s)
Oliver Iff, Quirin Buchinger, Magdalena Moczala-Dusanowska, Martin Kamp, Simon Betzold, Marcelo I. Davanco, Kartik Srinivasan, Sefaattin Tongay, Carlos Anton-Solanas, Sven Hofling, Christian Schneider
We demonstrate a deterministic Purcell-enhanced single-photon source realized by integrating an atomically thin WSe2 layer with a circular Bragg grating cavity. The cavity significantly enhances the photoluminescence from the atomically thin layer, and

Coherence and decoherence in the Harper-Hofstadter model

May 19, 2021
Author(s)
Ian Spielman, Qiyu Liang, Dimi Trypogeorgos, Ana Valdes-Curiel, Junheng Tao, Mingshu Zhao
We quantum simulated the 2D Harper-Hofstadter (HH) lattice model in a highly elongated tube geometry—three sites in circumference—using an atomic Bose-Einstein condensate. In addition to the usual transverse (out-of-plane) magnetic flux, piercing the

Multiple-camera defocus imaging of ultracold atomic gases

May 13, 2021
Author(s)
Ian Spielman, Francisco Salces Carcoba, Yuchen Yue, Seiji Sugawa, Abigail Perry
In cold atom experiments, each image of light refracted and absorbed by an atomic ensemble carries a remarkable amount of information. Numerous imaging techniques including absorption, fluorescence, and phase-contrast are commonly used. Other techniques
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