title: Versatile microwave-driven trapped ion spin system for quantum information processing.
abstract: Using trapped atomic ions, we demonstrate a tailored and versatile effective spin system suitable for quantum simulations and universal quantum computation. By simply applying microwave pulses, selected spins can be decoupled from the remaining system and, thus, can serve as a quantum memory, while simultaneously, other coupled spins perform conditional quantum dynamics. Also, microwave pulses can change the sign of spin-spin couplings, as well as their effective strength, even during the course of a quantum algorithm. Taking advantage of the simultaneous long-range coupling between three spins, a coherent quantum Fourier transform-an essential building block for many quantum algorithms-is efficiently realized. This approach, which is based on microwave-driven trapped ions and is complementary to laser-based methods, opens a new route to overcoming technical and physical challenges in the quest for a quantum simulator and a quantum computer.
authors.affiliation: Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Piltz
authors.affiliation: Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany.
authors.forename: Theeraphot
authors.identifier: 0000-0001-7257-7763
authors.initials: T
authors.lastname: Sriarunothai
authors.affiliation: Department of Physics, Sofia University, 5 James Bourchier Boulevard, 1164 Sofia, Bulgaria.
authors.forename: Svetoslav S
authors.identifier: 0000-0003-4857-7477
authors.initials: SS
authors.lastname: Ivanov
authors.affiliation: Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany.
authors.forename: Sabine
authors.initials: S
authors.lastname: Wölk
authors.affiliation: Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany.
authors.forename: Christof
authors.initials: C
authors.lastname: Wunderlich
mesh_terms: D007477:Ions / Q000737:chemistry; D008872:Microwaves; D008956:Models, Chemical; D011789:Quantum Theory; D013113:Spin Labels; D015018:Ytterbium / Q000737:chemistry
chemical_list: D007477:Ions; D013113:Spin Labels; D015018:Ytterbium
keywords: Quantum information science; long-range coupling; microwave-driven trapped ions; quantum computation; quantum fourier transform; quantum simulation; spin-spin coupling