Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session M08: Topological physics with cold atomsInvited Live
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Sponsoring Units: DCMP Chair: Chandra Raman, Georgia Tech Room: Portland 255 |
Thursday, June 4, 2020 8:00AM - 8:30AM Live |
M08.00001: Quantum interference of topological states of light Invited Speaker: Oded Zilberberg The introduction of topological concepts into photonics has opened up many exciting avenues of research. Much of this activity has been focused on the experimental observation of topologically-protected edge states in systems ranging from photonic crystals and metamaterials in the microwave domain, to arrays of coupled waveguides, and integrated silicon ring resonators in the visible domain. In all of these works, spatially-periodic dielectric structures act as lattices for light which, in combination with an engineered synthetic gauge field, lead to topological photonic energy bands. The resulting topological boundary states exhibit remarkable properties such as unidirectional propagation and robustness to noise that offer an opportunity to improve the performance and scalability of quantum technologies. For quantum applications, it is essential that the topological states are indistinguishable. I will report high-visibility quantum interference of two single-photon topological states in an integrated photonic circuit waveguide array, and observe a Hong-Ou-Mandel interference with 93.1 ± 2.8% visibility, a hallmark nonclassical effect that is at the heart of linear optics–based quantum computation. [Preview Abstract] |
Thursday, June 4, 2020 8:30AM - 9:00AM Live |
M08.00002: Building Laughlin pairs with light Invited Speaker: Logan Clark Can strongly correlated materials be formed from light? Ordinary photons, which freely propagate at the speed of light and do not interact with each other at all, cannot form such materials. However, I will explain how we turn photons into strongly-interacting cavity Rydberg polaritons, quasiparticles which inherit their spatial waveforms from the modes of an optical cavity and gain strong interactions from Rydberg excitations of an atomic gas. These polaritons can indeed form quantum materials. In fact, using this platform we have recently induced the formation of photon pairs in the Laughlin state, the paradigmatic example of a topologically ordered state which underlies the fractional quantum Hall effect in electron gases. We characterize these entangled photon pairs by measuring correlations in both real space and angular momentum space, exemplifying the unique and powerful new perspective that many-body quantum optical systems can provide for understanding quantum matter. [Preview Abstract] |
Thursday, June 4, 2020 9:00AM - 9:30AM Live |
M08.00003: Spinor Bose-Einstein condensates: from topological defects to synthetic Hall cylinders Invited Speaker: Yangqian Yan Spinor Bose-Einstein condensates of dilute atomic gases have allowed physicists to access important quantum phenomena unattainable in other systems. Yang monopole was proposed more than seventy years ago as a fundamental ingredient in non-abelian gauge theories. It was recently delivered for the first time in experiments by tailoring four cyclically-coupled hyperfine spin states of ultracold atoms. In the first part of this talk, I will show how Yang monopoles could be simulated by ultracold atoms. Including the effect of interactions between atoms, a Yang monopole could turn into a much broader range of topological defects. In the second part of this talk, I will show that adding momentum or angular momentum transfer to these cyclically coupled states, one realizes synthetic Hall cylinder or torus, which could be threaded by a net effective magnetic field through its surface. Such a synthetic Hall cylinder, of which the topology is drastically different than a ribbon, gives rise to a periodic lattice in real dimensions, in which the periodicity of the density modulation of atoms fractionalizes that of the Hamiltonian. I will further highlight the effect of topology by gluing two synthetic Hall cylinders together. In certain conditions, localization may emerge. If time permits, I will briefly discuss the interaction effects. [Preview Abstract] |
Thursday, June 4, 2020 9:30AM - 10:00AM Live |
M08.00004: Lattice experiments with Raman dressed Bose-Einstein condensates Invited Speaker: Peter Engels Dressing dilute-gas BECs with radiation fields, such as lasers, radio frequency or microwave fields, provides a rich arena to investigate unusual quantum phases and quantum dynamics. In recent years, Raman dressing a BEC with counterpropagating laser beams has proven to be a very successful pathway to investigate diverse phenomena including spin-orbit coupling, the breaking of Galilean invariance, Roton-like excitation minima and a supersolid-like phase. The flexibility of the system can be enhanced even further when additional radiation fields are employed in conjunction with a Raman-dressing laser field. In our experiments we study several novel systems along these lines. By combining Raman dressing with radio frequency coupling between hyperfine states, for example, a stationary or moving lattice structure can be created for the atoms even though neither Raman dressing nor radio frequency coupling alone would induce such a structure. Such a system has peculiar properties and applications that we investigate in our experiments. As a second example, combining Raman dressing with a suitably chosen optical standing wave generates a phase diagram featuring stripe phases that become accessible in the experiments. The current status and future perspectives of the experiments will be discussed. [Preview Abstract] |
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