Hertz-level measurement of the optical clock frequency in a single 88Sr+ ion HS Margolis, GP Barwood, G Huang, HA Klein, SN Lea, K Szymaniec, ...
Science 306 (5700), 1355-1358, 2004
458 2004 Observation of an electric octupole transition in a single ion M Roberts, P Taylor, GP Barwood, P Gill, HA Klein, WRC Rowley
Physical review letters 78 (10), 1876, 1997
194 1997 Quantum physics exploring gravity in the outer solar system: the SAGAS project P Wolf, CJ Bordé, A Clairon, L Duchayne, A Landragin, P Lemonde, ...
Experimental Astronomy 23, 651-687, 2009
166 2009 Einstein Gravity Explorer–a medium-class fundamental physics mission S Schiller, GM Tino, P Gill, C Salomon, U Sterr, E Peik, A Nevsky, A Görlitz, ...
Experimental astronomy 23, 573-610, 2009
145 2009 Agreement between two GP Barwood, G Huang, HA Klein, LAM Johnson, SA King, HS Margolis, ...
Physical Review A 89 (5), 050501, 2014
115 2014 Measurement of the Electric Quadrupole Moment of the GP Barwood, HS Margolis, G Huang, P Gill, HA Klein
Physical review letters 93 (13), 133001, 2004
112 2004 Absolute frequency measurement of the 674-nm HS Margolis, G Huang, GP Barwood, SN Lea, HA Klein, WRC Rowley, ...
Physical Review A 67 (3), 032501, 2003
109 2003 Laser cooling of trapped ytterbium ions using a four-level optical-excitation scheme AS Bell, P Gill, HA Klein, AP Levick, C Tamm, D Schnier
Physical Review A 44 (1), R20, 1991
85 1991 Analysis of thermal radiation in ion traps for optical frequency standards M Doležal, P Balling, PBR Nisbet-Jones, SA King, JM Jones, HA Klein, ...
Metrologia 52 (6), 842, 2015
74 2015 Trapped ion optical frequency standards P Gill, GP Barwood, HA Klein, G Huang, SA Webster, PJ Blythe, K Hosaka, ...
Measurement Science and Technology 14 (8), 1174, 2003
70 2003 Laser cooling of trapped Yb+ HA Klein, AS Bell, GP Barwood, P Gill
Applied Physics B 50, 13-17, 1990
67 1990 Observation of the 5s2 S1/2 −4d2 D5/2 transition in a single laser-cooled trapped Sr+ ion by using an all-solid-state system of lasers GP Barwood, CS Edwards, P Gill, HA Klein, WRC Rowley
Optics letters 18 (9), 732-734, 1993
56 1993 Optical clocks in space S Schiller, A Görlitz, A Nevsky, JCJ Koelemeij, A Wicht, P Gill, HA Klein, ...
Nuclear Physics B-Proceedings Supplements 166, 300-302, 2007
51 2007 Laser-Induced EG Myers, P Kuske, HJ Andrä, IA Armour, NA Jelley, HA Klein, JD Silver, ...
Physical Review Letters 47 (2), 87, 1981
51 1981 Astrodynamical Space Test of Relativity using Optical Devices I (ASTROD I)—a class-M fundamental physics mission proposal for Cosmic Vision 2015–2025 T Appourchaux, R Burston, Y Chen, M Cruise, H Dittus, B Foulon, P Gill, ...
Experimental Astronomy 23, 491-527, 2009
49 2009 Development of optical frequency standards based upon the/sup 2/S/sub 1/2/-/sup 2/D/sub 5/2/transition in/sup 88/Sr/sup+/and/sup 87/Sr/sup+ G Barwood, K Gao, P Gill, G Huang, HA Klein
IEEE Transactions on Instrumentation and Measurement 50 (2), 543-547, 2001
47 2001 Subkilohertz comparison of the single-ion optical-clock GP Barwood, G Huang, HA Klein, P Gill, RBM Clarke
Physical Review A 59 (5), R3178, 1999
47 1999 Observation of the hyperfine structure of the GP Barwood, K Gao, P Gill, G Huang, HA Klein
Physical Review A 67 (1), 013402, 2003
46 2003 Observations of the 1s2s3S1-1s2p3P2, 0 transitions in helium-like Ne8+ recoil ions produced in a gas target HA Klein, S Bashkin, BP Duval, F Moscatelli, JD Silver, HF Beyer, ...
Journal of Physics B: Atomic and Molecular Physics 15 (24), 4507, 1982
46 1982 Sub-kHz “clock” transition linewidths in a cold trapped 88Sr+ ion in low magnetic fields using 1092-nm polarisation switching GP Barwood, P Gill, G Huang, HA Klein, WRC Rowley
Optics communications 151 (1-3), 50-55, 1998
41 1998 