The Dicke subradiance and superradiance resulting from the interaction between surface plasmons of a nanosphere and an ensemble of quantum emitters have been investigated using a Green’s function approach. Based on such an investigation, we propose a scheme for a deterministic multi-qubit quantum phase gate. As an example, two-qubit, three-qubit, and four-qubit quantum phase gates have been designed and analyzed in detail. Phenomena due to the losses in the metal are discussed. Potential applications of these phenomena to quantum-information processing are anticipated.
© 2014 Optical Society of America
Original Manuscript: July 16, 2013
Revised Manuscript: November 14, 2013
Manuscript Accepted: November 27, 2013
Published: January 7, 2014
Jun Ren, Jun Yuan, and Xiangdong Zhang, "Multi-qubit quantum phase gates based on surface plasmons of a nanosphere," J. Opt. Soc. Am. B 31, 229-236 (2014)