Laser cooling of antihydrogen atoms

Baker, C. J.; Bertsche, W.; Capra, A.; Carruth, C.; Cesar, C. L.; Charlton, M.; Christensen, A.; Collister, R.; Mathad, A. Cridland; Eriksson, S.; Evans, A.; Evetts, N.; Fajans, J.; Friesen, T.; Fujiwara, M. C.; Gill, D. R.; Grandemange, P.; Granum, P.; Hangst, J. S.; Hardy, W. N.; Hayden, M. E.; Hodgkinson, D.; Hunter, E.; Isaac, C. A.; Johnson, M. A.; Jones, J. M.; Jones, S. A.; Jonsell, S.; Khramov, A.; Knapp, P.; Kurchaninov, L.; Madsen, N.; Maxwell, D.; McKenna, J. T.  K.; Menary, S.; Michan, J. M.; Momose, T.; Mullan, P. S.; Munich, J. J.; Olchanski, K.; Olin, A.; Peszka, J.; Powell, A.; Pusa, P.; Rasmussen, C. Ø.; Robicheaux, F.; Sacramento, R. L.; Sameed, M.; Sarid, E.; Silveira, D. M.; Starko, D. M.; So, C.; Stutter, G.; Tharp, T. D.; Thibeault, A.; Thompson, R. I.; van der Werf, D. P.; Wurtele, J. S.

doi:10.1038/s41586-021-03289-6

Laser cooling of antihydrogen atoms

Journal Article · Wed Mar 31 00:00:00 EDT 2021 · Nature (London)

DOI:https://doi.org/10.1038/s41586-021-03289-6· OSTI ID:1816445

Baker, C. J. ^[1]; Bertsche, W. ^[2]; Capra, A. ^[3]; Carruth, C. ^[4]; Cesar, C. L. ^[5]; Charlton, M. ^[6]; Christensen, A. ^[4]; Collister, R. ^[3]; ^[6]; Eriksson, S. ^[6]; Evans, A. ^[7]; Evetts, N. ^[8]; ^[4]; Friesen, T. ^[7]; ^[3]; Gill, D. R. ^[3]; Grandemange, P. ^[9]; ^[10]; Hangst, J. S. ^[10]; Hardy, W. N. ^[8] more »

Swansea Univ. (United Kingdom). College of Science. Dept. of Physics; OSTI
Univ. of Manchester (United Kingdom). School of Physics and Astronomy; Cockcroft Inst., Sci-Tech Daresbury, Warrington (United Kingdom)
TRIUMF, Vancouver, British Columbia (Canada)
Univ. of California, Berkeley, CA (United States). Dept. of Physics
Universidade Federal do Rio de Janeiro (Brazil). Instituto de Fisica
Swansea Univ. (United Kingdom). College of Science. Dept. of Physics
Univ. of Calgary, AB (Canada). Dept. of Physics and Astronomy
Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy
TRIUMF, Vancouver, British Columbia (Canada); Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy
Aarhus Univ. (Denmark). Dept. of Physics and Astronomy

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 collision¹. Slowing the translational motion of atoms and ions by application of such a force^2,3, known as laser cooling, was first demonstrated 40 years ago^4,5. It revolutionized atomic physics over the following decades^6–8, and it is now a workhorse in many fields, including studies on quantum degenerate gases, quantum information, atomic clocks and tests of fundamental physics. However, this technique has not yet been applied to antimatter. Here we demonstrate laser cooling of antihydrogen⁹, the antimatter atom consisting of an antiproton and a positron. By exciting the 1S–2P transition in antihydrogen with pulsed, narrow-linewidth, Lyman-α laser radiation^10,11, we Doppler-cool a sample of magnetically trapped antihydrogen. Although we apply laser cooling in only one dimension, the trap couples the longitudinal and transverse motions of the anti-atoms, leading to cooling in all three dimensions. We observe a reduction in the median transverse energy by more than an order of magnitude—with a substantial fraction of the anti-atoms attaining submicroelectronvolt transverse kinetic energies. We also report the observation of the laser-driven 1S–2S transition in samples of laser-cooled antihydrogen atoms. The observed spectral line is approximately four times narrower than that obtained without laser cooling. The demonstration of laser cooling and its immediate application has far-reaching implications for antimatter studies. A more localized, denser and colder sample of antihydrogen will drastically improve spectroscopic^11–13and gravitational¹⁴studies of antihydrogen in ongoing experiments. Furthermore, the demonstrated ability to manipulate the motion of antimatter atoms by laser light will potentially provide ground-breaking opportunities for future experiments, such as anti-atomic fountains, anti-atom interferometry and the creation of antimatter molecules.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Contributing Organization:: ALPHA Collaboration

Grant/Contract Number:: SC0012704

OSTI ID:: 1816445

Journal Information:: Nature (London), Journal Name: Nature (London) Journal Issue: 7852 Vol. 592; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

References (57)

Development of a Lyman-α laser system for spectroscopy and laser cooling of antihydrogen Michan, J. M.; Fujiwara, M. C.; Momose, T. Hyperfine Interactions, Vol. 228, Issue 1-3 https://doi.org/10.1007/s10751-014-1017-8	journal	February 2014
Narrowband solid state vuv coherent source for laser cooling of antihydrogen Michan, J. Mario; Polovy, Gene; Madison, Kirk W. Hyperfine Interactions, Vol. 235, Issue 1-3 https://doi.org/10.1007/s10751-015-1186-0	journal	May 2015
Lifetime of magnetically trapped antihydrogen in ALPHA Capra, A. Hyperfine Interactions, Vol. 240, Issue 1 https://doi.org/10.1007/s10751-018-1526-y	journal	January 2019
Status of the GBAR experiment at CERN Mansoulié, Bruno Hyperfine Interactions, Vol. 240, Issue 1 https://doi.org/10.1007/s10751-018-1550-y	journal	January 2019
Cooling of gases by laser radiation Hänsch, T. W.; Schawlow, A. L. Optics Communications, Vol. 13, Issue 1 https://doi.org/10.1016/0030-4018(75)90159-5	journal	January 1975
Antihydrogen production using trapped plasmas Gabrielse, G.; Rolston, S. L.; Haarsma, L. Physics Letters A, Vol. 129, Issue 1 https://doi.org/10.1016/0375-9601(88)90470-7	journal	May 1988
A magnetic trap for antihydrogen confinement Bertsche, W.; Boston, A.; Bowe, P. D. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 566, Issue 2 https://doi.org/10.1016/j.nima.2006.07.012	journal	October 2006
Antihydrogen annihilation reconstruction with the ALPHA silicon detector Andresen, G. B.; Ashkezari, M. D.; Bertsche, W. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 684 https://doi.org/10.1016/j.nima.2012.04.082	journal	August 2012
Silicon vertex detector upgrade in the ALPHA experiment Amole, C.; Andresen, G. B.; Ashkezari, M. D. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 732 https://doi.org/10.1016/j.nima.2013.05.188	journal	December 2013
The Antiproton Decelerator: AD Maury, S. Hyperfine Interactions, Vol. 109, Issue 1/4, p. 43-52 https://doi.org/10.1023/A:1012632812327	journal	August 1997
Production and detection of cold antihydrogen atoms Amoretti, M.; Amsler, C.; Bonomi, G. Nature, Vol. 419, Issue 6906 https://doi.org/10.1038/nature01096	journal	September 2002
Trapped antihydrogen Andresen, G. B.; Ashkezari, M. D.; Baquero-Ruiz, M. Nature, Vol. 468, Issue 7324 https://doi.org/10.1038/nature09610	journal	November 2010
Resonant quantum transitions in trapped antihydrogen atoms Amole, C.; Ashkezari, M. D.; Baquero-Ruiz, M. Nature, Vol. 483, Issue 7390 https://doi.org/10.1038/nature10942	journal	March 2012
An improved limit on the charge of antihydrogen from stochastic acceleration Ahmadi, M.; Baquero-Ruiz, M.; Bertsche, W. Nature, Vol. 529, Issue 7586 https://doi.org/10.1038/nature16491	journal	January 2016
Observation of the 1S–2S transition in trapped antihydrogen Ahmadi, M.; Alves, B. X. R.; Baker, C. J. Nature, Vol. 541, Issue 7638 https://doi.org/10.1038/nature21040	journal	December 2016
Observation of the hyperfine spectrum of antihydrogen Ahmadi, M.; Alves, B. X. R.; Baker, C. J. Nature, Vol. 548, Issue 7665 https://doi.org/10.1038/nature23446	journal	August 2017
A source of antihydrogen for in-flight hyperfine spectroscopy Kuroda, N.; Ulmer, S.; Murtagh, D. J. Nature Communications, Vol. 5, Issue 1 https://doi.org/10.1038/ncomms4089	journal	January 2014
Confinement of antihydrogen for 1,000 seconds Collaboration, Alpha Nature Physics, Vol. 7, Issue 7, p. 558-564 https://doi.org/10.1038/nphys2025	journal	January 2011
Antihydrogen accumulation for fundamental symmetry tests Ahmadi, M.; Alves, B. X. R.; Baker, C. J. Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/s41467-017-00760-9	journal	September 2017
Characterization of the 1S–2S transition in antihydrogen Ahmadi, M.; Alves, B. X. R.; Baker, C. J. Nature, Vol. 557, Issue 7703 https://doi.org/10.1038/s41586-018-0017-2	journal	April 2018
Observation of the 1S–2P Lyman-α transition in antihydrogen Ahmadi, M.; Alves, B. X. R.; Baker, C. J. Nature, Vol. 561, Issue 7722 https://doi.org/10.1038/s41586-018-0435-1	journal	August 2018
Investigation of the fine structure of antihydrogen No authors listed Nature, Vol. 578, Issue 7795, p. 375-380 https://doi.org/10.1038/s41586-020-2006-5	journal	February 2020
Real-time Detection of Antihydrogen Annihilations and Applications to Spectroscopy Stracka, Simone EPJ Web of Conferences, Vol. 71 https://doi.org/10.1051/epjconf/20147100126	journal	January 2014
Electron cyclotron resonance (ECR) magnetometry with a plasma reservoir Hunter, E. D.; Christensen, A.; Fajans, J. Physics of Plasmas, Vol. 27, Issue 3 https://doi.org/10.1063/1.5141999	journal	March 2020
A proposal for laser cooling antihydrogen atoms Donnan, P. H.; Fujiwara, M. C.; Robicheaux, F. Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 46, Issue 2 https://doi.org/10.1088/0953-4075/46/2/025302	journal	January 2013
Aspects of 1 S -2 S spectroscopy of trapped antihydrogen atoms Rasmussen, C. Ø; Madsen, N.; Robicheaux, F. Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 50, Issue 18 https://doi.org/10.1088/1361-6455/aa854c	journal	September 2017
In situ electromagnetic field diagnostics with an electron plasma in a Penning–Malmberg trap Amole, C.; Ashkezari, M. D.; Baquero-Ruiz, M. New Journal of Physics, Vol. 16, Issue 1 https://doi.org/10.1088/1367-2630/16/1/013037	journal	January 2014
Axial to transverse energy mixing dynamics in octupole-based magnetostatic antihydrogen traps Zhong, M.; Fajans, J.; Zukor, A. F. New Journal of Physics, Vol. 20, Issue 5 https://doi.org/10.1088/1367-2630/aabb84	journal	May 2018
Machine learning for antihydrogen detection at ALPHA Capra, A. Journal of Physics: Conference Series, Vol. 1085 https://doi.org/10.1088/1742-6596/1085/4/042007	journal	September 2018
AEgIS at ELENA: outlook for physics with a pulsed cold antihydrogen beam Doser, M.; Aghion, S.; Amsler, C. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 376, Issue 2116 https://doi.org/10.1098/rsta.2017.0274	journal	February 2018
Laser-driven production of the antihydrogen molecular ion Zammit, Mark C.; Charlton, Michael; Jonsell, Svante Physical Review A, Vol. 100, Issue 4 https://doi.org/10.1103/PhysRevA.100.042709	journal	October 2019
Positron trapping in an electrostatic well by inelastic collisions with nitrogen molecules Murphy, T. J.; Surko, C. M. Physical Review A, Vol. 46, Issue 9 https://doi.org/10.1103/PhysRevA.46.5696	journal	November 1992
Collisionless motion of neutral particles in magnetostatic traps Surkov, E. L.; Walraven, J. T. M.; Shlyapnikov, G. V. Physical Review A, Vol. 49, Issue 6 https://doi.org/10.1103/PhysRevA.49.4778	journal	June 1994
Continuous-wave Doppler cooling of hydrogen atoms with two-photon transitions Zehnlé, Véronique; Garreau, Jean Claude Physical Review A, Vol. 63, Issue 2 https://doi.org/10.1103/PhysRevA.63.021402	journal	January 2001
Laser cooling of atoms and molecules with ultrafast pulses Kielpinski, D. Physical Review A, Vol. 73, Issue 6 https://doi.org/10.1103/PhysRevA.73.063407	journal	June 2006
C P T tests with the antihydrogen molecular ion Myers, Edmund G. Physical Review A, Vol. 98, Issue 1 https://doi.org/10.1103/PhysRevA.98.010101	journal	July 2018
Evaporative cooling of magnetically trapped and compressed spin-polarized hydrogen Hess, Harald F. Physical Review B, Vol. 34, Issue 5 https://doi.org/10.1103/PhysRevB.34.3476	journal	September 1986
Pulsed Sisyphus Scheme for Laser Cooling of Atomic (Anti)Hydrogen Wu, Saijun; Brown, Roger C.; Phillips, William D. Physical Review Letters, Vol. 106, Issue 21 https://doi.org/10.1103/PhysRevLett.106.213001	journal	May 2011
Improved Measurement of the Hydrogen 1 S – 2 S Transition Frequency Parthey, Christian G.; Matveev, Arthur; Alnis, Janis Physical Review Letters, Vol. 107, Issue 20 https://doi.org/10.1103/PhysRevLett.107.203001	journal	November 2011
Trapped Antihydrogen in Its Ground State Gabrielse, G.; Kalra, R.; Kolthammer, W. S. Physical Review Letters, Vol. 108, Issue 11 https://doi.org/10.1103/PhysRevLett.108.113002	journal	March 2012
Antimatter Interferometry for Gravity Measurements Hamilton, Paul; Zhmoginov, Andrey; Robicheaux, Francis Physical Review Letters, Vol. 112, Issue 12 https://doi.org/10.1103/PhysRevLett.112.121102	journal	March 2014
Acceleration and Trapping of Particles by Radiation Pressure Ashkin, A. Physical Review Letters, Vol. 24, Issue 4 https://doi.org/10.1103/PhysRevLett.24.156	journal	January 1970
Radiation-Pressure Cooling of Bound Resonant Absorbers Wineland, D. J.; Drullinger, R. E.; Walls, F. L. Physical Review Letters, Vol. 40, Issue 25 https://doi.org/10.1103/PhysRevLett.40.1639	journal	June 1978
Optical-Sideband Cooling of Visible Atom Cloud Confined in Parabolic Well Neuhauser, W.; Hohenstatt, M.; Toschek, P. Physical Review Letters, Vol. 41, Issue 4 https://doi.org/10.1103/PhysRevLett.41.233	journal	July 1978
First Capture of Antiprotons in a Penning Trap: A Kiloelectronvolt Source Gabrielse, G.; Fei, X.; Helmerson, K. Physical Review Letters, Vol. 57, Issue 20 https://doi.org/10.1103/PhysRevLett.57.2504	journal	November 1986
Magnetic trapping of spin-polarized atomic hydrogen Hess, Harald F.; Kochanski, Greg P.; Doyle, John M. Physical Review Letters, Vol. 59, Issue 6 https://doi.org/10.1103/PhysRevLett.59.672	journal	August 1987
Experiments with Atomic Hydrogen in a Magnetic Trapping Field van Roijen, R.; Berkhout, J. J.; Jaakkola, S. Physical Review Letters, Vol. 61, Issue 8 https://doi.org/10.1103/PhysRevLett.61.931	journal	August 1988
Cooling and slowing of trapped antiprotons below 100 meV Gabrielse, G.; Fei, X.; Orozco, L. A. Physical Review Letters, Vol. 63, Issue 13 https://doi.org/10.1103/PhysRevLett.63.1360	journal	September 1989
Optical cooling of atomic hydrogen in a magnetic trap Setija, I. D.; Werij, H. G. C.; Luiten, O. J. Physical Review Letters, Vol. 70, Issue 15 https://doi.org/10.1103/PhysRevLett.70.2257	journal	April 1993
Two-Photon Spectroscopy of Trapped Atomic Hydrogen Cesar, Claudio L.; Fried, Dale G.; Killian, Thomas C. Physical Review Letters, Vol. 77, Issue 2 https://doi.org/10.1103/PhysRevLett.77.255	journal	July 1996
Continuous Wave Coherent Lyman- α Radiation Eikema, K. S. E.; Walz, J.; Hänsch, T. W. Physical Review Letters, Vol. 83, Issue 19 https://doi.org/10.1103/PhysRevLett.83.3828	journal	November 1999
Background-Free Observation of Cold Antihydrogen with Field-Ionization Analysis of Its States Gabrielse, G.; Bowden, N. S.; Oxley, P. Physical Review Letters, Vol. 89, Issue 21 https://doi.org/10.1103/PhysRevLett.89.213401	journal	October 2002
Nobel Lecture: The manipulation of neutral particles Chu, Steven Reviews of Modern Physics, Vol. 70, Issue 3 https://doi.org/10.1103/RevModPhys.70.685	journal	July 1998
Nobel Lecture: Manipulating atoms with photons Cohen-Tannoudji, Claude N. Reviews of Modern Physics, Vol. 70, Issue 3 https://doi.org/10.1103/RevModPhys.70.707	journal	July 1998
Nobel Lecture: Laser cooling and trapping of neutral atoms Phillips, William D. Reviews of Modern Physics, Vol. 70, Issue 3 https://doi.org/10.1103/RevModPhys.70.721	journal	July 1998
Laser cooling of magnetically trapped neutral atoms Helmerson, Kristian; Martin, Alex; Pritchard, David E. Journal of the Optical Society of America B, Vol. 9, Issue 11 https://doi.org/10.1364/JOSAB.9.001988	journal	January 1992
Continuous-wave Lyman-α generation with solid-state lasers Scheid, Martin; Kolbe, Daniel; Markert, Frank Optics Express, Vol. 17, Issue 14 https://doi.org/10.1364/OE.17.011274	journal	January 2009

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