Entanglement and teleportation of macroscopic continuous variables by superconducting devices

Details Entanglement and teleportation of macroscopic continuous variables by superconducting devices Entanglement and teleportation of macroscopic continuous variables by superconducting devices

2005-04-20

arxiv.org/abs/quant-ph/0504153v1

Physics

Quantum Physics

3 pages, 2 figures (in 5 .eps files)

Scientific paper

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.

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