Heralded linear optical quantum Fredkin gate based on one auxiliary qubit and one single photon detector

• DOI: 10.48550/arxiv.1401.5207
• Publication Date: 2014-01-01
• Authors: Changhua Zhu; Xin Cao; Dongxiao Quan; Changxing Pei
• Keywords: Controlled NOT gate; Quantum circuit

Linear optical quantum Fredkin gate can be applied to computing and multi-user communication network. In the existing linear scheme, two single photon detectors (SPDs) are used heralding success of while they have no count. But analysis results show that for non-perfect SPD lower detector efficiency, higher heralded rate by this scheme. We propose an improved designing a new scheme with auxiliary qubit only one SPD, in which detection efficiency detector, gate. The also work efficiently under non-ideal source. Based on gate, large-scale switching networks built. As example, Benes network is shown.