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| Open AccessEntanglement-enhanced matter-wave interferometry in a high-finesse cavity
A matter-wave interferometer is demonstrated with an interferometric phase noise below the standard quantum limit, combining two core concepts of quantum mechanics, that a particle can simultaneously be in two places at once and entanglement between distinct particles.
- Graham P. Greve
- , Chengyi Luo
- & James K. Thompson
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Article |
Self-oscillating pump in a topological dissipative atom–cavity system
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
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Article
| Open AccessContinuous Bose–Einstein condensation
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
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Article |
Observation of ultracold atomic bubbles in orbital microgravity
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
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Article
| Open AccessQuantum sensing for gravity cartography
A study reports a quantum gravity gradient sensor with a design that eliminates the need for long measurement times, and demonstrates the detection of an underground tunnel in an urban environment.
- Ben Stray
- , Andrew Lamb
- & Michael Holynski
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Article
| Open AccessIntegrated photonics enables continuous-beam electron phase modulation
A silicon nitride microresonator is used for coherent phase modulation of a transmission electron microscope beam, with future applications in combining high-resolution microscopy with spectroscopy, holography and metrology.
- Jan-Wilke Henke
- , Arslan Sajid Raja
- & Tobias J. Kippenberg
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Article |
Two-dimensional supersolidity in a dipolar quantum gas
Two-dimensional supersolidity is demonstrated using highly magnetic, ultracold dysprosium atoms.
- Matthew A. Norcia
- , Claudia Politi
- & Francesca Ferlaino
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Article |
Determination of the fine-structure constant with an accuracy of 81 parts per trillion
The fine-structure constant is determined with an accuracy of 81 parts per trillion using matter-wave interferometry to measure the rubidium atom recoil velocity.
- Léo Morel
- , Zhibin Yao
- & Saïda Guellati-Khélifa
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Letter |
Hypersonic Bose–Einstein condensates in accelerator rings
Bose–Einstein condensates are transported at hypersonic speeds over a distance of 15 cm in a neutral-atom accelerator ring while preserving their internal coherence.
- Saurabh Pandey
- , Hector Mas
- & Wolf von Klitzing
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Letter |
Space-borne Bose–Einstein condensation for precision interferometry
A Bose–Einstein condensate is created in space that has sufficient stability to enable its characteristic dynamics to be studied.
- Dennis Becker
- , Maike D. Lachmann
- & Ernst M. Rasel
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Letter |
Spontaneous emission of matter waves from a tunable open quantum system
An open quantum system containing ultracold rubidium atoms trapped in an optical lattice undergoes spontaneous emission of matter waves into free space.
- Ludwig Krinner
- , Michael Stewart
- & Dominik Schneble
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Letter |
Collective emission of matter-wave jets from driven Bose–Einstein condensates
Sufficiently strong modulation of the interaction strength in a Bose–Einstein condensate induces inelastic atom–atom scattering and causes collective emission of matter-wave jets from the condensate.
- Logan W. Clark
- , Anita Gaj
- & Cheng Chin
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Letter |
Ghost imaging with atoms
Ghost imaging is demonstrated using beams of correlated pairs of ultracold helium atoms, rather than photons, yielding a reconstructed image with submillimetre resolution.
- R. I. Khakimov
- , B. M. Henson
- & A. G. Truscott
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Brief Communications Arising |
Verifying quantum superpositions at metre scales
- D. M. Stamper-Kurn
- , G. E. Marti
- & H. Müller
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Letter |
Lightwave-driven quasiparticle collisions on a subcycle timescale
A quasiparticle collider is developed that uses femtosecond optical pulses to create electron–hole pairs in the layered dichalcogenide tungsten diselenide, and a strong terahertz field to accelerate and collide the electrons with the holes.
- F. Langer
- , M. Hohenleutner
- & R. Huber
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Letter |
Quantum superposition at the half-metre scale
Matter-wave interferometers provide an opportunity to measure whether quantum superpositions exist at macroscopic length scales or only at microscopically small scales; now such instruments have demonstrated quantum interference of wave packets separated by 54 cm.
- T. Kovachy
- , P. Asenbaum
- & M. A. Kasevich
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Letter |
Observation of non-Hermitian degeneracies in a chaotic exciton-polariton billiard
In non-Hermitian systems, spectral degeneracies can arise that can cause unusual, counter-intuitive effects; here exciton-polaritons—hybrid light–matter particles—within a semiconductor microcavity are found to display non-trivial topological modal structure exclusive to such systems.
- T. Gao
- , E. Estrecho
- & E. A. Ostrovskaya
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Letter |
Controlling neutron orbital angular momentum
Interferometry reveals quantized changes in the angular momentum of neutrons that have been ‘twisted’ by passage through a spiral staircase structure.
- Charles W. Clark
- , Roman Barankov
- & Dmitry A. Pushin
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Letter |
Quantum coherent optical phase modulation in an ultrafast transmission electron microscope
The coherent manipulation of electron quantum states using light, commonly employed in atoms and molecules, is extended to the case of free electron beams using ultrafast transmission electron microscopy; this approach may enable a range of applications in ultrafast electron imaging and spectroscopy down to attosecond precision.
- Armin Feist
- , Katharina E. Echternkamp
- & Claus Ropers
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Letter |
Atomic Hong–Ou–Mandel experiment
The Hong–Ou–Mandel effect—in which two indistinguishable photons that enter a 50:50 beam-splitter are found only as a pair at one of the two outputs, leading to a dip in the coincidence rate of the detectors—is now realized with 4He atoms instead of photons; this opens the way to performing basic quantum-physics experiments with mechanical observables of massive particles.
- R. Lopes
- , A. Imanaliev
- & C. I. Westbrook