No abstract

We present quantum simulation experiments of Ising-like spins on Platonic graphs, which are performed with two-dimensional arrays of Rydberg atoms and quantum-wire couplings. The quantum wires are used to couple otherwise uncoupled long-distance atoms, enabling topology-preserving transformtions of the three-dimensional graphs to the two-dimensional plane. We implement three Platonic graphs, tetrahedron, cube, and octahedron of Platonic solids, and successfully probe their ground many-body spin configurations before and after the quasi-adiabatic control of the system Hamiltonians from the paramagnetic phase to anti-ferromagnetic-like phases. Our small-scale quantum simulations of using less than 22 atoms are limited by experimental imperfections, which can be easily improved by the state-of-the-art Rydberg-atom technologies for more than 1000-atom scales. Our quantum-wire approach is expected to pave a new route towards large-scale quantum simulations.

Neutral atoms trapped in an array of optical dipole traps are EIT-cooled to a temperature of T f = 2.8 μK. With an observed EIT cooling rate of 1400 /s for theory limt of n∞ = 0.03, we measure the average quanta of n = 1.5.

Simultaneous imaging of a three-dimensional distribution of point sources is presented. In a two-lens microscope, the point-spreads on the quasi-image plane, which is located between the Fourier and image planes, are spatially distinct, so a set of Fresnel lenslets can perform individual wave-front shaping for axial and lateral rearrangements of the images. In experiments performed with single atoms and holographically programmed lenslets, various three-dimensional arrangements of point sources, including axially aligned atoms, are successfully refocused on the screen, demonstrating the simultaneous and time-efficient detection of the three-dimensional holographic imaging. We expect that non-sequential real-time measurements of three-dimensional point sources shall be in particular useful for quantum correlation measurements and in situ tracking of dynamic particles.

No abstract

Single atoms movable from one place to another would enable a flying quantum memory that can be useful for dynamic quantum computing architectures. Guided atoms, e.g., by optical tweezers, provide a partial solution, but the benefit of flying qubits could be lost if they still interact with the guiding means. Here we propose and experimentally demonstrate freely flying atoms that are not guided but instead thrown and caught by optical tweezers. We provide a set of proof-of-principle flying atom demonstrations, which include atom transport through optical tweezers, atom arrangements by flying atoms, and atom scattering off optical tweezers. In experiments, cold rubidium atoms at 40 µK temperature are thrown by accelerating optical tweezers, freely fly with up to a speed of 0.65 m/s and free-flying distance of 4.2 µm, and are recaptured and stopped by decelerating optical tweezers at a transportation efficiency of 94(3)%. Flying atoms suggest possible applications such as defect correction in a tweezer trap atom array, fast atom-array formation, Rydberg-atom collision studies, and dynamic quantum computing architectures.