Topological Quantum Information in a 3D Neutral Atom Array.

摘要

Work was performed to build core elements of a quantum computer using neutral atoms in an optical lattice, with the ultimate end to execute a version of the Kitaev toric code Hamiltonian model . Toward that end we have demonstrated the execution of single qubit gates on any arbitrary sequence of individual lattice sites in a 5x5x5 array. This entailed improving laser cooling in a 3D large spacing lattice, developing flexible state manipulation techniques, and demonstrating long atomic coherence times (exceeding 5 seconds). We designed, built and installed two MEMS mirror-controlled addressing beams that allow us to rapidly shift target atoms into resonance with microwave fields for the execution of gates. We demonstrated that we can perform single qubit gates in approximately 500 microseconds on target atoms without affecting quantum information in non-target atoms. On the theoretical side, we developed a paradigm for implementing digital quantum simulations in finite systems, including a dissipative mechanism that allows thermalization to arbitrary temperatures, and applied this to realization of the toric code Hamiltonian within our trapped neutral atoms architecture.