Deterministic nonlinear phase gates induced by a single qubit. (9th May 2018)

• Record Type: Journal Article
• Authors: Park, Kimin; Marek, Petr; Filip, Radim
• Is Part Of: New journal of physics. Volume 20:Number 5(2018:May)
• Publication Date: 2018-05-09
• Subjects: quantum information processing with continuous variables -- quantum gates -- quantum optics -- cold trapped ions -- cavity and circuit quantum electrodynamics; Physics -- Periodicals; Physics; Periodicals; 530.05
• DOI: 10.1088/1367-2630/aabb86
• Languages: English
• ISSNs: 1367-2630

Abstract

Abstract: We propose deterministic realizations of nonlinear phase gates by repeating a finite sequence of non-commuting Rabi interactions between a harmonic oscillator and only a single two-level ancillary qubit. We show explicitly that the key nonclassical features of the ideal cubic phase gate and the quartic phase gate are generated in the harmonic oscillator faithfully by our method. We numerically analyzed the performance of our scheme under realistic imperfections of the oscillator and the two-level system. The methodology is extended further to higher-order nonlinear phase gates. This theoretical proposal completes the set of operations required for continuous-variable quantum computation.