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Atomic and Molecular Physics, and Optics

Atomic and Molecular Physics, and Optics

The physics of atoms, molecules, and light, including quantum optics, laser physics, spectroscopy, photonics, quantum information, and optical technologies

11 papers in this specialization

Paperzilla Papers in Atomic and Molecular Physics, and Optics

Quantum-enhanced multiparameter sensing in a single mode

This research demonstrates simultaneous measurement of position and momentum of a trapped ion below the standard quantum limit, using "modular variables" which bypass the uncertainty principle. They also developed a new method to prepare and control "number-phase states," achieving improved measurements of number and phase. These advances enable more precise measurements than classically possible.

Sep 25, 01:47 PM

Continuous operation of a coherent 3,000-qubit system

This study introduces a new technique for "reloading" neutral atom arrays during quantum computations, allowing them to operate continuously for extended periods. This addresses a key challenge of maintaining these arrays, paving the way for more complex quantum calculations.

Sep 23, 05:31 AM

Learning local and semi-local density functionals from exact exchange-correlation potentials and energies

Researchers developed new local and semi-local density functionals for Density Functional Theory (DFT) using neural networks trained on exact exchange-correlation potentials and energies from a small set of atoms and molecules. While showing promising accuracy for molecules, further development is needed to ensure good performance for solids.

Sep 23, 01:21 AM

Tracing terahertz plasmon polaritons with a tunable-by-design dispersion in topological insulator metaelements

This study demonstrates tuning the wavevector of plasmon polaritons on Bi2Se3 resonators by adjusting the gap between laterally coupled structures. Using terahertz scattering-type scanning near-field optical microscopy, the researchers observed that the gap size influences both plasmon wavelength and damping losses.

Sep 09, 07:19 AM

Single-shot readout of the nuclear spin of an on-surface atom

Researchers achieved single-shot readout of a titanium-49 atom's nuclear spin using a scanning tunneling microscope, revealing a surprisingly long lifetime of 5.3 seconds. They explored how this lifetime is affected by electron tunneling and radio frequency signals, offering atomic-level insights into nuclear spin relaxation.

Sep 04, 08:06 PM

A Spin-Based Pathway to Testing the Quantum Nature of Gravity

This white paper proposes an experiment to test if gravity is quantum by seeing if it can entangle two micron-sized diamonds in superposition. The experiment relies on embedding spins in the diamonds and using the Stern-Gerlach effect to create the superposition, with measurements of the spins then used to detect entanglement.

Sep 03, 06:22 PM

A fluorescent-protein spin qubit

This study presents a genetically encodable fluorescent protein, EYFP, as an optically addressable spin qubit for nanoscale magnetic field sensing inside living cells. The researchers demonstrated coherent control and readout of the qubit's spin state at both cryogenic and room temperatures, although with lower contrast at room temperature. They also observed a coherence time of up to 16 microseconds under specific decoupling sequences and expressed the protein in both bacterial and mammalian cells, maintaining its functionality.

Aug 22, 06:57 AM

The state of optics research in Colombia: a scientometric analysis

Optics research in Colombia has experienced significant growth in the last two decades, with increasing output and citation impact, ranking second in Latin America after Chile. While international collaboration plays a vital role in the high impact of Colombian optics research, there's a need to increase the impact of research led by Colombian researchers themselves.

Jul 14, 05:07 PM

Velocity effect on the stimulated transition process of a multilevel atom in a thermal bath

The study calculates the stimulated emission and absorption rates of a uniformly moving atom in a thermal bath of quantum electromagnetic radiation, finding these rates depend on atomic velocity, bath temperature, and atomic polarizability. This suggests the temperature of the quantum electromagnetic field is relative and observer-dependent, similar to the Unruh effect, but with directional temperature variations depending on the atom's polarizability.

s10052-021-09477-y.pdf

Jul 14, 05:07 PM

Coherent control techniques in three-level quantum sensing

This paper proposes using composite pulse sequences in three-level quantum systems to amplify the effects of small Rabi frequency and detuning errors, enabling their detection. By repeatedly applying control pulses with specific phases, the sensitivity to these errors is increased, potentially improving quantum sensing capabilities.

Jul 14, 05:07 PM

Recent developments in the general atomic and molecular electronic structure system

This paper details substantial updates and additions to the quantum chemistry software GAMESS, including fragmentation methods, coupled cluster improvements, density functional updates, and increased utilization of graphical processing units (GPUs) and other parallel computing strategies. These enhancements aim to improve the performance, scalability, and overall usability of the software for studying larger molecular systems.

viewcontent.cgi.pdf

Jul 14, 07:01 AM

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