2011/03/31 by Mingfeng Wang, Ming-Feng Wang, Nian-Quan Jiang +3
Computer Science · Mathematics · Physics and Astronomy · #Algorithm #Computation #Computer science #Continuous variable #Controlled NOT gate #Fidelity #High fidelity #Mathematics #Noise (video) #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum computer #Quantum decoherence #Quantum gate #Quantum mechanics #Quantum optics and atomic interactions #Variable (mathematics) #quant-ph
paper · pdf · doi:10.1103/physreva.83.062339
7 pages, 3 figures, to appear in Physical Review A
arxiv created 2011/05/31 · openalex publication_date 2011/06/30 · arxiv updated 2015/05/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The continuous-variable controlled-Z gate is a canonical two-mode gate for universal continuous-variable quantum computation. It is considered as one of the most fundamental continuous-variable quantum gates. Here we present a scheme for realizing continuous-variable controlled-Z gate between two optical beams using an atomic ensemble. The gate is performed by simply sending the two beams propagating in two orthogonal directions twice through a spin-squeezed atomic medium. Its fidelity can run up to one if the input atomic state is infinitely squeezed. Considering the noise effects due to atomic decoherence and light losses, we show that the observed fidelities of the scheme are still quite high within presently available techniques.