title: Trapped-Ion Quantum Logic with Global Radiation Fields.
abstract: Trapped ions are a promising tool for building a large-scale quantum computer. However, the number of required radiation fields for the realization of quantum gates in any proposed ion-based architecture scales with the number of ions within the quantum computer, posing a major obstacle when imagining a device with millions of ions. Here, we present a fundamentally different approach for trapped-ion quantum computing where this detrimental scaling vanishes. The method is based on individually controlled voltages applied to each logic gate location to facilitate the actual gate operation analogous to a traditional transistor architecture within a classical computer processor. To demonstrate the key principle of this approach we implement a versatile quantum gate method based on long-wavelength radiation and use this method to generate a maximally entangled state of two quantum engineered clock qubits with fidelity 0.985(12). This quantum gate also constitutes a simple-to-implement tool for quantum metrology, sensing, and simulation.
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Weidt
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.|QOLS, Blackett Laboratory, Imperial College London, London SW7 2BW, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Randall
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
authors.forename: S C
authors.initials: SC
authors.lastname: Webster
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
authors.forename: K
authors.initials: K
authors.lastname: Lake
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
authors.forename: A E
authors.initials: AE
authors.lastname: Webb
authors.affiliation: Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Givat Ram, Israel.
authors.forename: I
authors.initials: I
authors.lastname: Cohen
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
authors.forename: T
authors.initials: T
authors.lastname: Navickas
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
authors.forename: B
authors.initials: B
authors.lastname: Lekitsch
authors.affiliation: Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Givat Ram, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Retzker
authors.affiliation: Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, United Kingdom.
authors.forename: W K
authors.initials: WK
authors.lastname: Hensinger