Ultracold gases articles within Nature

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  • Article
    | Open Access

    An approach called wavefunction matching transforms particle interactions so that their wavefunctions match those of easily computable interactions, to allow for calculations of quantum many-body systems that would otherwise be difficult or impossible.

    • Serdar Elhatisari
    • , Lukas Bovermann
    •  & Gianluca Stellin

  • Article |

    Boson sampling using ultracold atoms in a two-dimensional, tunnel-coupled optical lattice is enabled by high-fidelity programmable control with optical tweezers of a large number of atoms trapped in an optical lattice.

    • Aaron W. Young
    • , Shawn Geller
    •  & Adam M. Kaufman

  • Article
    | Open Access

    A new method based on the Josephson effect is described, allowing to measure the superfluid fraction of a supersolid, which captures the effect of spatially periodic modulation leading to reduction in the stiffness of superfluids.

    • G. Biagioni
    • , N. Antolini
    •  & G. Modugno

  • Article
    | Open Access

    Ultracold polyatomic molecules can be created by electroassociation in a degenerate Fermi gas of microwave-dressed polar molecules through a field-linked resonance.

    • Xing-Yan Chen
    • , Shrestha Biswas
    •  & Xin-Yu Luo

  • Article |

    Using upgraded hardware of the multiuser Cold Atom Lab (CAL) aboard the International Space Station (ISS), Bose–Einstein condensates (BECs) of two atomic isotopes are simultaneously created and used to demonstrate interspecies interactions and dual species atom interferometry in space.

    • Ethan R. Elliott
    • , David C. Aveline
    •  & Jason R. Williams

  • Article |

    The realization of dipolar quantum solids with an ultracold gas of magnetic atoms in an optical lattice ushers in quantum simulation of many-body systems with long-range anisotropic interactions.

    • Lin Su
    • , Alexander Douglas
    •  & Markus Greiner

  • Article
    | Open Access

    This study reports the creation of a model thermodynamic engine that is fuelled by the energy difference resulting from changing the statistics of a quantum gas from bosonic to fermionic.

    • Jennifer Koch
    • , Keerthy Menon
    •  & Artur Widera

  • Article |

    The magnetic phases of the geometrically frustrated triangular lattice Hubbard model are directly investigated using ultracold fermionic atoms, indicating a possible transition to ferromagnetism at a filling of 1.2.

    • Muqing Xu
    • , Lev Haldar Kendrick
    •  & Markus Greiner

  • Article |

    Equilibrium-like state variables, related by an equation of state, are identified in a study of turbulent cascade of matter waves in a far-from-equilibrium ultracold atomic Bose gas.

    • Lena H. Dogra
    • , Gevorg Martirosyan
    •  & Zoran Hadzibabic

  • Article |

    Nearly integrable one-dimensional Bose gases are used to explain the behaviour of many-body quantum systems immediately after a rapid, high-energy quench, which shows two distinct timescales, one for hydrodynamization and the other for local prethermalization.

    • Yuan Le
    • , Yicheng Zhang
    •  & David S. Weiss

  • Article |

    Quantum simulation of superfluid to Mott insulator transition in twisted-bilayer square lattices based on atomic Bose–Einstein condensates loaded into spin-dependent optical lattices provides a new direction for exploring moiré physics in ultracold atoms.

    • Zengming Meng
    • , Liangwei Wang
    •  & Jing Zhang

  • Article
    | Open Access

    A type of universal scattering resonance between ultracold microwave-dressed polar molecules associated with field-linked tetramer bound states in the long-range potential well is observed, providing a general strategy for resonant scattering between ultracold polar molecules.

    • Xing-Yan Chen
    • , Andreas Schindewolf
    •  & Xin-Yu Luo

  • Article |

    Observations of a pronounced and narrow Feshbach resonance in collisions between two triplet ground-state NaLi molecules are described, providing evidence for the existence of long-lived coherent intermediate complexes even in systems without reaction barriers.

    • Juliana J. Park
    • , Yu-Kun Lu
    •  & Wolfgang Ketterle

  • Article |

    Experiments demonstrate the powerful capabilities of ultracold molecules to study dynamics in the context of quantum magnetism, and create new possibilities for studying quantum physics with ultracold molecules more broadly.

    • Lysander Christakis
    • , Jason S. Rosenberg
    •  & Waseem S. Bakr

  • Article |

    Tunable itinerant spin dynamics enabled by dipolar interactions are demonstrated with polar molecules, establishing an interacting spin platform that allows for exploration of many-body spin dynamics and spin-motion physics using strong, tunable dipolar interaction.

    • Jun-Ru Li
    • , Kyle Matsuda
    •  & Jun Ye

  • Article |

    The authors measure elastic p-wave interaction energies in pairs of fermionic atoms occupying the lowest two orbitals of an optical lattice; isolation of individual pairs of atoms protects against three-body recombination, enabling a theoretical maximum of interaction energy to be achieved.

    • Vijin Venu
    • , Peihang Xu
    •  & Joseph H. Thywissen

  • Article |

    The behaviour of quantum fields in curved spacetime is simulated using a two-dimensional trapped quantum gas of potassium atoms with a configurable trap and adjustable interaction strength.

    • Celia Viermann
    • , Marius Sparn
    •  & Markus K. Oberthaler

  • Article |

    A mechanism for self-oscillating pumping in a quantum gas is demonstrated using a Bose–Einstein condensate coupled to a dissipative cavity, where a particle current is observed without external periodic driving.

    • Davide Dreon
    • , Alexander Baumgärtner
    •  & Tobias Donner

  • Article |

    An optically coupled Bose–Einstein condensate of potassium atoms is used to engineer chiral interactions and perform the quantum simulation of a one-dimensional reduction of the topological Chern–Simons gauge theory.

    • Anika Frölian
    • , Craig S. Chisholm
    •  & Leticia Tarruell

  • Article
    | Open Access

    A general and efficient approach to evaporatively cool ultracold polar molecules through elastic collisions to create a degenerate quantum gas in three dimensions is demonstrated using microwave shielding.

    • Andreas Schindewolf
    • , Roman Bause
    •  & Xin-Yu Luo

  • Article |

    Precise control over the quantum state of a two-dimensional Fermi gas together with single-particle-resolved fluorescence imaging enables the direct observation of the formation of Cooper pairs at the Fermi surface.

    • Marvin Holten
    • , Luca Bayha
    •  & Selim Jochim

  • Article
    | Open Access

    Continuous, indefinitely lasting Bose–Einstein condensation, sustained by amplification through Bose-stimulated gain of atoms from a thermal bath, creates a continuous-wave condensate of strontium atoms.

    • Chun-Chia Chen
    • , Rodrigo González Escudero
    •  & Florian Schreck

  • Article |

    Bubbles of ultracold atoms have been created, observed and characterized at the NASA Cold Atom Lab onboard the International Space Station, made possible by the microgravity environment of the laboratory.

    • R. A. Carollo
    • , D. C. Aveline
    •  & N. Lundblad

  • Article |

    Entangled pairs of fermionic atoms in an optical lattice array have long-lived motional coherence, and the motion of each pair results in a robust qubit, protected by exchange symmetry.

    • Thomas Hartke
    • , Botond Oreg
    •  & Martin Zwierlein

  • Article |

    Spontaneous crystallization of atoms occurs in a rotating ultracold Bose–Einstein condensate occupying the lowest Landau level, behaviour that is related to a quantum hydrodynamic instability driven by shear forces.

    • Biswaroop Mukherjee
    • , Airlia Shaffer
    •  & Martin Zwierlein

  • Article |

    Magnetically tunable interactions between lithium atoms and barium ions are used to demonstrate and probe Feshbach resonances between atoms and ions, which could have applications in the fields of experimental quantum simulation and fundamental physics.

    • Pascal Weckesser
    • , Fabian Thielemann
    •  & Tobias Schaetz

  • Article |

    Directly coupling cavity photons to the photo-association resonances of pairs of atoms in a strongly interacting Fermi gas generates pair polaritons—hybrid excitaions coherently mixing photons, atom pairs and molecules.

    • Hideki Konishi
    • , Kevin Roux
    •  & Jean-Philippe Brantut

  • Article
    | Open Access

    A globally chiral atomic superfluid is induced by time-reversal symmetry breaking in an optical lattice and exhibits global angular momentum, which is expected to lead to topological excitations and the demonstration of a topological superfluid.

    • Xiao-Qiong Wang
    • , Guang-Quan Luo
    •  & Zhi-Fang Xu

  • Article |

    A programmable quantum simulator with 256 qubits is created using neutral atoms in two-dimensional optical tweezer arrays, demonstrating a quantum phase transition and revealing new quantum phases of matter.

    • Sepehr Ebadi
    • , Tout T. Wang
    •  & Mikhail D. Lukin

  • Article |

    First and second sound are experimentally observed in a two-dimensional superfluid, and the temperature-dependent sound speeds reveal the predicted jump in the superfluid density at the infinite-order Berezinskii–Kosterlitz–Thouless transition.

    • Panagiotis Christodoulou
    • , Maciej Gałka
    •  & Zoran Hadzibabic

  • Article |

    A Bose-Einstein condensate of molecules is produced by pairing atoms in an atomic condensate; this transition is the bosonic analog of the Bardeen-Cooper-Schrieffer superfluid to BEC crossover in Fermi gases.

    • Zhendong Zhang
    • , Liangchao Chen
    •  & Cheng Chin

  • Article |

    A many-atom state of trapped 171Yb atoms that are entangled on an optical atomic-clock transition overcomes the standard quantum limit, providing a proof-of-principle demonstration towards entanglement-based optical atomic clocks.

    • Edwin Pedrozo-Peñafiel
    • , Simone Colombo
    •  & Vladan Vuletić

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