2005/04/20 by L. Fisch, Fisch, L., I. E. Mazets +3
Physics and Astronomy · #FOS: Physical sciences #Quantum Physics (quant-ph) #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con #quant-ph
paper · pdf · doi:10.48550/arxiv.quant-ph/0504153
3 pages, 2 figures (in 5 .eps files)
arxiv created 2005/04/20 · arxiv updated 2009/12/01
A current-biased low-temperature superconducting Josephson junction (JJ) is dynamically describable by the quantized motion of a fictitious particle in a "washboard" potential. The long coherence time of tightly-bound states in the washboard potential of a JJ has prompted the effort to couple JJs and operate them as entangled qubits, capable of forming building blocks of a scalable quantum computer. Here we consider a hitherto unexplored quantum aspect of coupled JJs: the ability to produce Einstein-Podolsky-Rosen (EPR) entanglement of their continuous variables, namely, their magnetic fluxes and induced charges. Such entanglement, apart from its conceptual novelty, is the prerequisite for a far-reaching goal: teleportation of the flux and charge variables between JJs, implementing the transfer of an unknown quantum state along a network of such devices.