Publications

Ion trap with attached molecular beam line

Costas Christoforou, Corentin Pignot, Ezra Kassa, Hiroki Takahashi, Matthias Keller
Enhanced ion–cavity coupling through cavity cooling in the strong coupling regime. Scientific Reports 10, 15693 (2020) [PDF 1.8MB]

The datasets for the figures are available on Figshare.


Anas R. Peerzada, Callan M. Jobson, Ezra Kassa, Jack Morphew, Xavier Fernandez-Gonzalvo, Matthias Keller
Versatile Optical Fiber Feedthroughs for Ultra-High Vacuum Applications.
Vacuum 180,  109542 (2020)


Hiroki Takahashi, Ezra Kassa, Costas Christoforou, Matthias Keller
Strong coupling of a single ion to an optical cavity.
Physical Review Letters 124 (1), 013602 (2020)


Thomas  Walker,  Samir Vartabi Kashanian, Travers Ward, Matthias  Keller
Improving the Indistinguishability of Single Photons from an Ion-Cavity System.
Physical Review A 102, 032616 (2020)
The datasets for the figures are available here.


Ryan Wagner, Felipe Guzman, Akobuije Chijioke, Gurpreet Kaur Gulati, Matthias Keller and Gordon Shaw
Direct measurement of radiation pressure and circulating power inside a passive optical cavity.
Optics Express 26, 23492-23506 (2018).


Chistopher Foot, Dimitrios Trypogeorgos, Elliot Bentine, Amy Gardner, and Matthias Keller
Two-frequency operation of a Paul trap to optimise confinement of two species of ions.
International Journal of Mass Spectrometry 430, 117-125 (2018)


Thomas Walker, Koichiro Miyanishi, Rikizo Ikuta, Hiroki Takahashi, Samir Vartabi Kashanian, Yoshiaki Tsujimoto, Kazuhiro Hayasaka, Takashi Yamamoto, Nobuyuki Imoto and Matthias Keller
Long-distance single photon transmission from a trapped ion via quantum frequency conversion.
Physical review letters 120 (20), 203601 (2018)


Ezra Kassa, Hiroki Takahashi, Costas Christoforou and Matthias Keller
Precise positioning of an ion in an integrated Paul trap-cavity system using radiofrequency signals.
Journal of Modern Optics 65 (5-6), 520-528 (2018)


Hiroki Takahashi, Pedro Nevado and Matthias Keller
Mølmer–Sørensen entangling gate for cavity QED systems.
Journal of Physics B  50, 19 (2017)


Hiroki Takahashi, Ezra Kassa, Costas Christoforou, and Matthias Keller
Cavity-induced anticorrelated photon-emission rates of a single ion.
Phys. Rev. A 96, 023824  (2017)


Gurpreet Kaur Gulati, Hiroki Takahashi, Nina Podoliak, Peter Horak and Matthias Keller
Fiber cavities with integrated mode matching optics.
Scientific Reports 7, 5556 (2017)


Nina Podoliak, Hiroki Takahashi, Matthias Keller and Peter Horak
Harnessing the mode mixing in optical fiber-tip cavities.
Journal of Physics B 50, 085503 (2017)


Nina Podoliak, Hiroki Takahashi, Matthias Keller and Peter Horak
Comparative Numerical Studies of Ion Traps with Integrated Optical Cavities.
Phys. Rev. Applied 6, 044008 (2016)


S. Begley, M. Vogt, G. Kaur Gulati, H. Takahashi, and M. Keller
Optimized Multi-Ion Cavity Coupling.
Phys. Rev. Lett.  116, 223001 (2016)


A. Márquez Seco, H. Takahashi and M. Keller
Novel Ion Trap Design for Strong Ion-Cavity Coupling.
Atoms  4, 15 (2016)


X. Calmet and M. Keller
Cosmological Evolution of Fundamental Constants: From Theory to Experiment.
Mod. Phys. Lett. A 30, 1540028 (2015); arXiv:1410.2765


N. Deb, L.L. Pollum, A.D. Smith, M. Keller, C.J. Rennick, B.R. Heazlewood, and T.P. Softley
Coulomb crystal mass spectrometry in a digital ion trap.
Phys. Rev. A 91, 033408 (2015)


M. Kajita, G. Gopakumar, M. Abe, M. Hada and M. Keller,
Test of mp/me changes using vibrational transitions in N2+.
Phys. Rev. A 89, 032509 (2014)


A. Gardner, K. Sheridan, W. Groom, N. Seymour-Smith and M. Keller
Precision spectroscopy technique for dipole-allowed transitions in laser-cooled ions.
Appl. Phys. B 117, 755-762 (2014)


Hiroki Takahashi, Jack Morphew, Fedja Oručević, Atsushi Noguchi, Ezra Kassa, and Matthias Keller
Novel laser machining of optical fibers for long cavities with low birefringence.
Optics Express  22, 31317-31328 (2014)


M. Keller,
Interfacing Atoms and Light–The Smaller the Stronger.
Science (Perspective) 340, 1175 (2013)


H. Takahashi, A. Wilson, A. Riley-Watson, F. Orucevic, N. Seymour-Smith, M. Keller and W. Lange,
An integrated fiber trap for single-ion photonics.
New J. Phys. 15, 053011 (2013)


K. Sheridan, N. Seymour-Smith, A. Gardner and M. Keller,
All-optical broadband excitation of the motional state of trapped ions.
Eur. Phys. J. D 66, 289 (2012).


E. Brama, A. Mortensen, M. Keller and W. Lange,
Heating rates in a thin ion trap for microcavity experiments.
Appl. Phys. B 107, 945-954 (2012).


K. Sheridan, W. Lange and M. Keller,
All-optical ion generation for ion trap loading.
Appl. Phys. B 104, 755-761 (2011).


K. Sheridan and M. Keller,
Weighing of trapped ion crystals and its applications.
New J. Phys. 13, 123002 (2011).


N. Seymour-Smith, P. Blythe, M. Keller, and W. Lange,
Fast scanning cavity offset lock for laser frequency drift stabilization.
Rev. Sci. Instrum. 81, 075109 (2010).


M.Keller, B. Lange, K. Hayasaka, W. Lange, and H. Walther,
Stable long-term coupling of a single ion to a cavity mode.
J. Mod. Opt. 54, pages 1607-1617 (2007).


M.Keller, B. Lange, K. Hayasaka, W. Lange, and H.Walther,
Long-term stability of continuous-wave emission  from an ion-cavity system.
Eur. Phys. J. D 32, pages 161-166 (2005).