TY - JOUR
AU - Elena Jordan
AU - Kevin Gilmore
AU - Athreya Shankar
AU - Arghavan Safavi-Naini
AU - Justin Bohnet
AU - Murray Holland
AU - John Bollinger
AB - We experimentally study electromagnetically induced transparency cooling of the drumhead modes of planar two-dimensional arrays with up to 
N≈190 Be+ ions stored in a Penning trap. Substantial sub-Doppler cooling is observed for all N drumhead modes. Quantitative measurements for the center-of-mass mode show near ground-state cooling with motional quantum numbers of ¯n=0.3±0.2 obtained within 200 μs. The measured cooling rate is faster than that predicted by single particle theory, consistent with a quantum many-body calculation. For the lower frequency drumhead modes, quantitative temperature measurements are limited by frequency instabilities, but near ground-state cooling of the full bandwidth is strongly suggested. This advance will greatly improve the performance of large trapped ion crystals in quantum information and metrology applications.
BT - Physical Review Letters
DA - 2019-02
DO - 10.1103/PhysRevLett.122.053603
N2 - We experimentally study electromagnetically induced transparency cooling of the drumhead modes of planar two-dimensional arrays with up to 
N≈190 Be+ ions stored in a Penning trap. Substantial sub-Doppler cooling is observed for all N drumhead modes. Quantitative measurements for the center-of-mass mode show near ground-state cooling with motional quantum numbers of ¯n=0.3±0.2 obtained within 200 μs. The measured cooling rate is faster than that predicted by single particle theory, consistent with a quantum many-body calculation. For the lower frequency drumhead modes, quantitative temperature measurements are limited by frequency instabilities, but near ground-state cooling of the full bandwidth is strongly suggested. This advance will greatly improve the performance of large trapped ion crystals in quantum information and metrology applications.
PY - 2019
EP - 053603
T2 - Physical Review Letters
TI - Near Ground-State Cooling of Two-Dimensional Trapped-Ion Crystals with More than 100 Ions
UR - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.053603
VL - 122
SN - 0031-9007
ER -