Atoms trapped in the optical lattice may move due to quantum tunneling... -
optical lattice

Atoms trapped in the optical lattice may move due to quantum tunneling...

wikipedia - 07 Nov 2016
Atoms trapped in the optical lattice may move due to quantum tunneling, even if the potential well depth of the lattice points exceeds the kinetic energy of the atoms, which is similar to the electrons in a conductor. However, a superfluid–Mott insulator transition may occur, if the interaction energy between the atoms becomes larger than the hopping energy when the well depth is very large. In the Mott insulator phase, atoms will be trapped in the potential minima and cannot move freely, which is similar t
optical lattice

A bridge to the quantum world

Phys.Org - 22 Oct 2018
Monika Aidelsburger uses a special type of optical lattice to simulate quantum many-body phenomena that are otherwise inaccessible to experimental exploration. She has now been awarded an ERC Starting Grant to pursue this work.
optical lattice

High-accuracy clocks testing time difference on Skytree

Asahi Shimbun - 14 Oct 2018
Developed by Katori in 2005, the equipment, one of the world's most accurate clocks, is known as the optical lattice clock. It is the first time that one has been used outside a lab. That sort of clock has a precision of 10 to the minus 18 power, which ...
optical lattice

Gravity's effect on time tested at Tokyo Skytree

NHK WORLD - 03 Oct 2018
A team led by University of Tokyo Professor Hidetoshi Katori placed ultra-precise clocks on the ground level and the 450-meter-high observation deck of Tokyo Skytree between Tuesday night and Wednesday morning. The so-called optical lattice clocks use ...
optical lattice

Viewpoint: Sharpening the Features of Optical Lattices

Physics - 20 Feb 2018
The physical mechanism underlying most optical lattices is the ac-Stark effect, in which laser light causes shifts in an atom's ground-state energy. In the standing-wave pattern created from two or more laser beams, this ac-Stark shift will vary with ...
optical lattice

Viewpoint: Atoms Oscillate Collectively in Large Optical Lattice

Physics - 14 Feb 2018
Optical lattices are key elements in the effort to use ultracold atoms for quantum simulation, quantum computing, and atomic clocks. These lattices rely on light forces to precisely hold atoms in space and to individually control their internal states [1].
optical lattice

Optical lattice clock shatters precision record - 19 Mar 2018
The new clock is located at the National Institute of Standards and Technology (NIST) in Boulder, Colorado and uses thousands of strontium atoms confined in a 3D optical lattice. A laser is used to excite an extremely stable, high-frequency transition ...
optical lattice

Portable optical lattice clock measures elevation - 27 Feb 2018
A portable optical lattice clock on a trailer has been used to measure elevation deep inside a mountain near the France-Italy border. Although this elevation measurement is not as precise as conventional geodetic methods, the experiment marks an ...
optical lattice

Viewpoint: A Boost in Precision for Optical Atomic Clocks

Physics - 05 Mar 2018
Their device, which is based on thousands of ultracold Sr atoms confined in a 3D optical lattice, surpasses the previous “best” optical clock [3] by a factor of 1.4 in precision. Given that clocks already have such astonishingly high levels of ...
optical lattice

A Fermi-degenerate three-dimensional optical lattice clock

Science Magazine - 05 Oct 2017
Some of today's most advanced clocks are made up of large numbers of atoms lined up in a one-dimensional (1D) optical lattice. The numbers improve clock stability, but atomic interactions can limit accuracy. Campbell et al. loaded their fermionic ...
optical lattice

Viewpoint: Non-Hermitian Topological Systems

Physics - 24 Sep 2018
In 2015, the first NH topological system was demonstrated in an experiment with a 1D lattice of coupled optical waveguides engineered with loss [10]. But the experiments were thought to be specific to a particular system, and several theory papers ...
optical lattice

Fluorine flows in, makes material metal

Phys.Org - 16 Oct 2018
Tests and calculations at Rice showed fluorinating tungsten disulfide locks in the new state, which has unique optical and magnetic properties. The researchers also noted the transformation's effect on the material's tribological ...

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