Versatile laser-free trapped-ion entangling gates. (28th March 2019)

• Record Type: Journal Article
• Authors: Sutherland, R T; Srinivas, R; Burd, S C; Leibfried, D; Wilson, A C; Wineland, D J; Allcock, D T C; Slichter, D H; Libby, S B
• Is Part Of: New journal of physics. Volume 21:Number 3(2019:Mar.)
• Publication Date: 2019-03-28
• Subjects: quantum physics -- quantum computing -- quantum logic -- quantum gates -- atomic physics -- trapped-ions -- geometric phase gates; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/ab0be5
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We present a general theory for laser-free entangling gates with trapped-ion hyperfine qubits, using either static or oscillating magnetic-field gradients combined with a pair of uniform microwave fields symmetrically detuned about the qubit frequency. By transforming into a 'bichromatic' interaction picture, we show that either σ ̂ ϕ ⨂ σ ̂ ϕ or σ ̂ z ⨂ σ ̂ z geometric phase gates can be performed. The gate basis is determined by selecting the microwave detuning. The driving parameters can be tuned to provide intrinsic dynamical decoupling from qubit frequency fluctuations. The σ ̂ z ⨂ σ ̂ z gates can be implemented in a novel manner which eases experimental constraints. We present numerical simulations of gate fidelities assuming realistic parameters.