News: Research Highlights

Thu May 2, 2019

Atomically Thin Mirrors Made from a Monolayer Semiconductor

Conventional mirrors have fundamental thickness limitations: the skin depth for metallic mirrors, and the wavelength of light for dielectric mirrors. Recently, the Park Group has demonstrated that these limitations can be overcome with the atomically thin semiconductor molybdenum diselenide [1]. To understand how this can be achieved, one has to consider how light is reflected...
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Thu May 2, 2019

Quantum state engineering of a Hubbard system with ultracold fermions

Accessing new regimes in quantum simulation requires the development of new techniques for quantum state preparation. We demonstrate the quantum state engineering of a strongly correlated many-body state of the two-component repulsive Fermi-Hubbard model on a square lattice. Our scheme makes use of an ultralow entropy doublon band insulator created through entropy redistribution. After isolating...
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Thu May 2, 2019

Probing entanglement in a many-body-localized system

An interacting quantum system that is subject to disorder may cease to thermalize due to localization of its constituents, thereby marking the breakdown of thermodynamics. The key to our understanding of this phenomenon lies in the system’s entanglement, which is experimentally challenging to measure. We realize such a many-body-localized system in a disordered Bose-Hubbard chain...
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Thu May 2, 2019

String patterns in the doped Hubbard model

Understanding strongly correlated quantum many-body states is one of the most thought-provoking challenges in modern research. For example, the Hubbard model, describing strongly correlated electrons in solids, still contains fundamental open questions on its phase diagram. In this work we realize the Hubbard Hamiltonian and search for specific patterns within many individual images of realizations...
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Tue April 30, 2019

Spin Transport in a Mott Insulator of Ultracold Fermions

Superconductivity is a phenomenon in materials whereby electron pairs can flow freely without resistance. As a consequence, no energy is lost while electrical current passes through the superconductor. The benefits, therefore, of superconducting materials which operate at room temperature are countless, and range from revolutionizing the electrical power transmission industry, to providing sweeping improvements in...
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Wed April 24, 2019

Single Molecule Results from the Ni Labs

Molecules are intrinsic coherent quantum system that have long been recognized as promising building blocks for quantum simulations, ideal natural laboratory to search for new physics, and a playground to answer fundamental questions in chemical reactions. Achieving full quantum control of molecules in bulk gases have been a forefront goal of the field that generally...
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Mon April 22, 2019

Near Unitary Squeezing

A group at the MIT led by Prof. Vladan Vuletić has recently generated significant amount of spin squeezing-a type of quantum entanglement-in an ultracold vapor of ytterbium-171. Spin squeezed states (SSS) can be used to overcome the standard quantum limit (SQL) which bounds state-of-the-art atomic sensors like optical clocks. The latter deploy a dilute vapor...
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Mon April 22, 2019

Direct Laser Cooling Rubidium Atoms

A group at MIT led by Vladan Vuletic has recently created a Bose-Einstein Condensate (BEC) of rubidium atoms with a new method, direct laser cooling. Many researchers have attempted this elusive goal in the past, but due to various complications resorted to reaching BEC through evaporation instead. Compared to cooling through evaporation, laser cooling is...
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Tue April 2, 2019

Quantum sensing method measures minuscule magnetic fields

MIT researchers find a new way to make nanoscale measurements of fields, including information about their direction.

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Wed October 17, 2018

Improved Measurement of the Electron’s Electric Dipole Moment

Although the Standard Model of particle physics, one of the triumphs of modern physics, accurately describes all particle physics measurements made in laboratories so far, it is unable to answer many questions that arise from cosmological observations, such as the long-standing puzzle of why matter dominates over antimatter throughout the observable universe. To explain these...
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