Laser cooling ≈ Laser cooling
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Cooling of a levitated nanoparticle to the motional quantum ground state Open
A nanoparticle trapped and cooled Cooling massive particles to the quantum ground state allows fundamental tests of quantum mechanics to be made; it would provide an experimental probe of the boundary between the classical and quantum worl…
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Zeptonewton force sensing with nanospheres in an optical lattice Open
Optically trapped nanospheres in high-vaccum experience little friction and\nhence are promising for ultra-sensitive force detection. Here we demonstrate\nmeasurement times exceeding $10^5$ seconds and zeptonewton force sensitivity\nwith l…
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Sisyphus Laser Cooling of a Polyatomic Molecule Open
We perform magnetically assisted Sisyphus laser cooling of the triatomic free radical strontium monohydroxide (SrOH). This is achieved with principal optical cycling in the rotationally closed P(N^{''}=1) branch of either the X[over ˜]^{2}…
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Laser Cooling of a Micromechanical Membrane to the Quantum Backaction Limit Open
The radiation pressure of light can act to damp and cool the vibrational motion of a mechanical resonator, but even if the light field has no thermal component, shot noise still sets a limit on the minimum phonon occupation. In optomechani…
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Building one molecule from a reservoir of two atoms Open
Lighting the way to molecules, one by one When chemists run reactions, what they are really doing is mixing up an enormous number of reacting partners and then hoping that they collide productively. It is possible to manipulate atoms more …
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Laser Cooled YbF Molecules for Measuring the Electron’s Electric Dipole Moment Open
We demonstrate one-dimensional sub-Doppler laser cooling of a beam of YbF molecules to 100 μK. This is a key step towards a measurement of the electron's electric dipole moment using ultracold molecules. We compare the effectiveness of mag…
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Narrow-Line Cooling and Imaging of Ytterbium Atoms in an Optical Tweezer Array Open
Engineering controllable, strongly interacting many-body quantum systems is at the frontier of quantum simulation and quantum information processing. Arrays of laser-cooled neutral atoms in optical tweezers have emerged as a promising plat…
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Optoelectrical Cooling of Polar Molecules to Submillikelvin Temperatures Open
We demonstrate direct cooling of gaseous formaldehyde (H2CO) to the microkelvin regime. Our approach, optoelectrical Sisyphus cooling, provides a simple dissipative cooling method applicable to electrically trapped dipolar molecules. By re…
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Cavity Cooling of a Levitated Nanosphere by Coherent Scattering Open
We report three-dimensional (3D) cooling of a levitated nanoparticle inside an optical cavity. The cooling mechanism is provided by cavity-enhanced coherent scattering off an optical tweezer. The observed 3D dynamics and cooling rates are …
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Nonlinear Dynamics and Strong Cavity Cooling of Levitated Nanoparticles Open
Optomechanical systems explore and exploit the coupling between light and the mechanical motion of macroscopic matter. A nonlinear coupling offers rich new physics, in both quantum and classical regimes. We investigate a dynamic, as oppose…
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Polyatomic Candidates for Cooling of Molecules with Lasers from Simple Theoretical Concepts Open
A rational approach to identify polyatomic molecules that appear to be promising candidates for direct Doppler cooling with lasers is outlined. First-principles calculations for equilibrium structures and Franck-Condon factors of selected …
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Cavity-Based 3D Cooling of a Levitated Nanoparticle via Coherent Scattering Open
We experimentally realize cavity cooling of all three translational degrees of motion of a levitated nanoparticle in vacuum. The particle is trapped by a cavity-independent optical tweezer and coherently scatters tweezer light into the blu…
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Parametric feedback cooling of levitated optomechanics in a parabolic mirror trap Open
Levitated optomechanics, a new experimental physics platform, holds promise for fundamental science and quantum technological sensing applications. We demonstrate a simple and robust geometry for optical trapping in vacuum of a single nano…
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Experimental Realization of a Thermal Squeezed State of Levitated Optomechanics Open
We experimentally squeeze the thermal motional state of an optically levitated nanosphere by fast switching between two trapping frequencies. The measured phase-space distribution of the center of mass of our particle shows the typical sha…
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Polyatomic molecules as quantum sensors for fundamental physics Open
Precision measurements in molecules have advanced rapidly in recent years through developments in techniques to cool, trap, and control. The complexity of molecules makes them a challenge to study, but also offers opportunities for enhance…
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1D Magneto-Optical Trap of Polyatomic Molecules Open
We demonstrate a 1D magneto-optical trap of the polar free radical calcium monohydroxide (CaOH). A quasiclosed cycling transition is established to scatter ∼10^{3} photons per molecule, predominantly limited by interaction time. This enabl…
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Feedback Cooling of a Room Temperature Mechanical Oscillator close to its Motional Ground State Open
Source data for figures.
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Creation of a Bose-condensed gas of <sup>87</sup> Rb by laser cooling Open
Packing rubidium into quantum degeneracy When atomic gases, such as those of alkali elements, are cooled to very low temperatures, they can reach a state of quantum degeneracy, where their quantum nature comes to the fore. In this process,…
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Laser Cooling of a Nanomechanical Oscillator to Its Zero-Point Energy Open
Optomechanical systems in the well-resolved-sideband regime are ideal for studying a myriad of quantum phenomena with mechanical systems, including backaction-evading measurements, mechanical squeezing, and nonclassical states generation. …
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Deep Laser Cooling and Efficient Magnetic Compression of Molecules Open
We introduce a scheme for deep laser cooling of molecules based on robust dark states at zero velocity. By simulating this scheme, we show it to be a widely applicable method that can reach the recoil limit or below. We demonstrate and cha…
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Photonic integrated beam delivery for a rubidium 3D magneto-optical trap Open
Cold atoms are important for precision atomic applications including timekeeping and sensing. The 3D magneto-optical trap (3D-MOT), used to produce cold atoms, will benefit from photonic integration to improve reliability and reduce size, …
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All-Optical Bose-Einstein Condensates in Microgravity Open
We report on the all-optical production of Bose-Einstein condensates in microgravity using a combination of grey molasses cooling, light-shift engineering and optical trapping in a painted potential. Forced evaporative cooling in a 3-m hig…
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Molecular Asymmetry and Optical Cycling: Laser Cooling Asymmetric Top Molecules Open
We present a practical roadmap to achieve optical cycling and laser cooling of asymmetric top molecules (ATMs). Our theoretical analysis describes how reduced molecular symmetry, as compared to diatomic and symmetric nonlinear molecules, p…
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Direct Laser Cooling to Bose-Einstein Condensation in a Dipole Trap Open
We present a method for producing three-dimensional Bose-Einstein condensates using only laser cooling. The phase transition to condensation is crossed with 2.5×10^{4} ^{87}Rb atoms at a temperature of T_{c}=0.6 μK after 1.4 s of cooling. …
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Laser cooling of antihydrogen atoms Open
The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision 1 . Slowing the translational motion of atoms and ions by application of such…
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An intense, cold, velocity-controlled molecular beam by frequency-chirped laser slowing Open
These are the data presented in figures 3, 4, 5, 6 and 7 of our paper "An intense, cold, velocity-controlled molecular beam by frequency-chirped laser slowing". The first line of each data file explains the content. The second line labels …
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Characteristics of a magneto-optical trap of molecules Open
We present the properties of a magneto-optical trap (MOT) of CaF molecules. We study the process of loading the MOT from a decelerated bu er-gas-cooled beam, and how best to slow this molecular beam in order to capture the most molecules. …
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Spectroscopy of cold rubidium Rydberg atoms for applications in quantum information Open
Atoms in highly excited (Rydberg) states have a number of unique properties\nwhich make them attractive for applications in quantum information. These are\nlarge dipole moments, lifetimes and polarizabilities, as well as strong\nlong-range…
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Designing arbitrary one-dimensional potentials on an atom chip Open
We use laser light shaped by a digital micro-mirror device to realize arbitrary optical dipole potentials for one-dimensional (1D) degenerate Bose gases of 87Rb trapped on an atom chip. Superposing optical and magnetic potentials combines …
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Efficient Ground-State Cooling of Large Trapped-Ion Chains with an Electromagnetically-Induced-Transparency Tripod Scheme Open
We report the electromagnetically-induced-transparency (EIT) cooling of a large trapped ^{171}Yb^{+} ion chain to the quantum ground state. Unlike conventional EIT cooling, we engage a four-level tripod structure and achieve fast sub-Doppl…