Bulletin of the American Physical Society
49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 63, Number 5
Monday–Friday, May 28–June 1 2018; Ft. Lauderdale, Florida
Session J02: Quantum Engineering with Ultracold Molecules |
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Sponsoring Units: GFB Chair: Kang-Kuen Ni, Harvard University Room: Grand A |
Wednesday, May 30, 2018 10:30AM - 11:00AM |
J02.00001: Quantum Control of Ultracold Dipolar Molecules Invited Speaker: Sebastian Will Ultracold molecules are poised to open new routes for precision measurements, quantum information, and many-body quantum physics. In particular, dipolar molecules with long-range interactions promise the creation of novel states of matter, such as quantum crystals and topological phases. A crucial prerequisite for advances in this direction is full quantum control over individual molecules and molecular ensembles. In the first part, I will present our recent work at MIT, demonstrating coherent quantum control of ultracold NaK molecules. Starting with spin-polarized molecular ensembles, we show coherent coupling into excited rotational states [1]. We demonstrate that superpositions of molecular hyperfine states can display coherence times on the scale of one second -- a result which may have important implications for the use of dipolar molecules in quantum information [2]. In the second part, I will present the current status of our new experiment at Columbia University, which is geared to observe strongly interacting physics with ultracold dipolar molecules, and conclude with an outlook on the prospects of ultracold molecules. [1] Will et al., PRL 116, 225306 (2016), [2] Park et al., Science 357, 372-375 (2017) [Preview Abstract] |
Wednesday, May 30, 2018 11:00AM - 11:30AM |
J02.00002: Microwave shielding of ultracold dipolar molecules Invited Speaker: Goulven Quéméner Ultracold dipolar molecules are excellent candidates for engineering quantum applications and controlled chemistry [1]. Therefore a lot of effort is devoted nowadays to produce ground state ultracold molecules in high densities as well as to understand their properties [2]. One of a main goal is to create a quantum degenerate gas of dipolar molecules such as a Bose-Einstein condensate [3] or a degenerate Fermi gas [4]. This is for now a major missing step for ultracold molecules. Unfortunatelly, when the molecules start to collide, whether thay are chemically reactive or not, a lot of molecules are lost in the process. Hoping for a long-lived quantum degenerate gas is then compromised unless to shield the molecules from collisional losses. This can be achieved by using a static electric field [5] but also by using microwaves [6]. I will show preliminary results for ultracold collisions of NaRb + NaRb in a microwave field and I will present how one can suppress the collisional losses of molecules as a function of the detuning, intensity and polarization of the field. This might be a necessary requirement for successful evaporative cooling to take place and for reaching quantum degeneracy. [1] L. Carr et al., New J. Phys. 11, 055049 (2009) ; J. L. Bohn et al., Science 357, 1002 (2017) [2] G. Quéméner, P. Julienne, Chem. Rev. 112, 4949 (2012) [3] E. Cornell, C. Wieman, Rev. Mod. Phys.74, 875 (2002); W. Ketterle, Rev. Mod. Phys. 74, 1131 (2002) [4] B. DeMarco, D. Jin, Science 285, 1703 (1999) [5] M. L. González-Martínez, J. L. Bohn, G. Quéméner, Phys. Rev. A 96, 032718 (2017) [6] A. Micheli et al., Phys. Rev. A 76, 043604 (2007) [Preview Abstract] |
Wednesday, May 30, 2018 11:30AM - 12:00PM |
J02.00003: Collisions of ultracold ground-state NaRb molecules Invited Speaker: Dajun Wang In this talk, I will report our recent work on the production and investigation of an ultracold sample of absolute ground-state $^{\mathrm{23}}$Na$^{\mathrm{87}}$Rb molecules via Raman transfer of weakly bound molecules formed by magnetoassociation. A series of investigations, including the inelastic collisions with different chemical reactivity and with and without the induced dipole-dipole interaction, will be discussed. [Preview Abstract] |
Wednesday, May 30, 2018 12:00PM - 12:30PM |
J02.00004: A Fermi degenerate gas of polar molecules Invited Speaker: Jun Ye Quantum gases of polar molecules provide power experimental platforms for the realization of novel many-body quantum phases. In earlier experiments we used a quantum synthesis approach to produce a low entropy gas of ground-state KRb polar molecules with >25% filling in a three-dimensional optical lattice, corresponding to entropy per molecule of 2.2 kB . In the new Generation II JILA experiment, we have produced a bulk gas of 100,000 KRb molecules on a redesigned apparatus, with the bulk temperature already below the Fermi temperature. To realize a full control of the molecular rotational coherence and interactions, the apparatus contains in-vacuum electrodes for generating microwave fields and large (30 kV/cm) DC electric fields, including adjustable field gradients. We will present progress towards evaporation of molecules in a one-dimensional optical lattice. [Preview Abstract] |
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