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.
Bibliographical noteFunding Information:
This work is supported by the U.K. Engineering and Physical Sciences Research Council [EP/G007276/1, the UK Quantum Technology hub for Networked Quantum Information Technologies (EP/M013243/1), the UK Quantum Technology hub for Sensors and Metrology (EP/M013294/1)], the European Commissions Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No.270843 (iQIT), the Army Research Laboratory under Cooperative Agreement No.W911NF-12-2-0072, U.S. Army Research Office Contract No.W911NF-14-2-0106, and the University of Sussex. A.R. acknowledges the support of the Israel Science Foundation (Grant No.039-8823), the support of the European commission (STReP EQUAM Grant Agreement No.323714), the Niedersachsen-Israeli Research Cooperation Program and DIP program (FO 703/2-1) and the support of the US Army Research Office under Contract No.W911NF-15-1-0250.
© 2016 American Physical Society.