Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Precision Spectroscopy of atoms and ions III (joint session A/Q)
A 9.6: Vortrag
Montag, 11. März 2019, 17:45–18:00, S HS 2 Physik
Staggered-immersion cooling of a quantum gas in optical lattices — •Bing Yang1,2,3, Hui Sun1,2,3, Chun-jiong Huang2,3, Han-yi Wang1,2,3, You-jin Deng2,3, Han-ning Dai1,2,3, Zhen-sheng Yuan1,2,3, and Jian-wei Pan1,2,3 — 1Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China — 3CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
Here we realize efficient cooling of ten thousand ultracold bosons in staggered optical lattices. By immersing Mott-insulator samples into removable superfluid reservoirs, thermal entropy is extracted from the system. Losing less than half of the atoms, we lower the entropy of a Mott insulator by 65-fold, achieving a record-low entropy per particle of 0.0019 kB (kB is the Boltzmann constant). We further engineer the sample to a defect-free array of isolated single atoms and successfully transfer it into a coherent many-body state. The present staggered-immersion cooling opens up an avenue for exploring novel quantum matters and promises practical applications in quantum information science.