Creation of maximally entangled photon-number states using optical fiber multiports

作者：Geoff J. Pryde, Andrew G. White · 发表于：Physical Review A · 年份：2003 · DOI：10.1103/physreva.68.052315 · 被引用次数：91 · 研究领域：Quantum Information and Cryptography、Quantum Mechanics and Applications、Quantum Computing Algorithms and Architecture

We theoretically demonstrate a method for producing the maximally path-entangled state $(1/\sqrt{2})(|N,0〉+\mathrm{exp}[\mathrm{iN}\ensuremath{\varphi}]|0,N〉)$ using intensity-symmetric multiport beam splitters, single photon inputs, and either photon-counting postselection or conditional measurement. The use of postselection enables successful implementation with non-unit efficiency detectors. We also demonstrate how to make the same state more conveniently by replacing one of the single photon inputs by a coherent state.