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Physical Review A

The generation of “Schrödinger-cat” states with superconducting devices is scrutinized. While the size of the cat cannot be quantified by standard measurements of avoided crossings, another metric is shown to appropriately witness large-scale quantum coherence.

Florian Fröwis, Benjamin Yadin, and Nicolas Gisin Phys. Rev. A 97 , 042103 (2018)

Solving the dynamics of a system described by a time-dependent nonlinear Jaynes-Cummings model is a daunting task due to time-ordering effects. The problem is shown to be circumvented by quantizing the pump field, leading to exactly solvable solutions.

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Topological properties of noninteracting band structures of quasicrystal potentials are studied, where concepts such as the pseudo–Brillouin zone, spiral holonomy, generalized Berry phase, and Berry curvatures are discussed using a class of relatively simple models.

Stephen Spurrier and Nigel R. Cooper Phys. Rev. A 97 , 043603 (2018)

High-precision measurements of nuclear-spin-dependent parity-violation (NSD-PV) effects are demonstrated with the diatomic molecule BaF, where the sensitivity of the measurements is expected to be sufficient to measure NSD-PV effects of the size anticipated across a wide range of nuclei.

Emine Altuntaş, Jeffrey Ammon, Sidney B. Cahn, and David DeMille Phys. Rev. A 97 , 042101 (2018)

A family of bosonic quantum error-correcting codes is introduced to boost the reliability of quantum computation schemes against photon loss. These codes, which are based on symmetry properties of three-wave-mixing interactions, are hardware efficient for architectures involving microwave photons stored in superconducting resonators.

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The transition frequency between the 2 1 S 0 and 3 1 D 2 states of 4 He atoms is measured by two-photon spectroscopy with an accuracy more than one order of magnitude higher than in previous experiments. The determination of some related transition frequencies provides a good test against the theoretically calculated energy levels.

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EXAMPLE: For the former DORIS III storage ring at DESY, E amounts to 4500 MeV , giving a factor of γ ~ 9000 . Thus the forward collimation to an angular spread of about 1/γ arises from the application of the relativistic Doppler effect in the forward direction as shown in the figure.

The most common synchrotron radiation sources today are storage rings like the ESRF in Grenoble or PETRA III at DESY, where a “beam” of electrons is stored and kept on a circular path, producing synchrotron radiation used as a light source for experiments. However, the charged particles in PETRA III are not distributed evenly along the accelerator but move in individual packets of ~4.8 x10 12 electrons (so-called bunches). Typcially 960, 480, 60 or 40 bunches of electrons are stored in PETRA III with an beam current of 100 mA in top-up mode. For top-up mode small amounts of current must periodically be injected to maintain a nearly constand beam current (here: 100 mA).

storage rings

Radiation is produced whenever these bunches are transversely accelerated, e.g. in the bending magnets or special insertion magnet devices, wigglers and undulators. At the experiments, therefore, the light arrives in short pulses. As a typical example of time frames, in PETRA III the pulses last about 100 picoseconds and repeat every 8 ns (960 bunches), 16 ns 128 ns or 192 ns (40 bunches). This pulsed light can be effectively used for specialized research applications needing time resolution.

Polarization:

An important property of synchrotron light is its polarization. Looking into the orbit plane of the circulating electrons, the projected movement is an oscillation similar to the simple harmonic motion in an antenna.

This implies that the emitted light is linearly polarized in the orbit plane. Out of plane, the motion is seen as an ellipse and elliptical polarization is observed.

1. As said above, radiation is emitted whenever the relativistically moving electrons are forced to deviate from a straight line motion. This is usually done by applying magnet fields. Bending magnets were the first available sources of synchrotron radiation because they are needed to produce the closed path motion in the storage ring. The radiation has the following characteristics:

Bending magnets

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