Quantum gates between atoms coupled by surface plasmons of a nanowire

Christian Stehle, Claus Zimmermann, Sebastian Slama

F. Y. Hong, S. J. Xiong

David Dzsotjan, Anders Søndberg Sørensen, Michael Fleischhauer

We investigate a system consisting of a single, as well as two emitters strongly coupled to surface plasmon modes of a nanowire using a Green's function approach. Explicit expressions are derived for the spontaneous decay rate into the plasmon modes and for the atom-plasmon coupling as well as a plasmon-mediated atom-atom coupling. Phenomena due to the presence of losses in the metal are discussed. In case of two atoms, we observe Dicke subradiance and superradiance resulting from their plasmon-mediated interaction. Based on this phenomenon, we propose a scheme for a deterministic two-qubit quantum gate. We also discuss a possible realization of interesting many-body Hamiltonians, such as the spin-boson model, using strong emitter-plasmon coupling.

Mohsen Ghaderi Goran Abad, Mohammad Mahmoudi

Jie Yang, Guang Lin, Yueping Niu +1 more

We propose a scheme to generate quantum entangling gate using one-dimensional surface plasmon waveguide. The protocol is based on the detection of the transmission spectrum of the single optical plasmons passing through two separate three-level emitters on metallic nanowire waveguide. It is shown that the low efficiency in direct detection of the single photon can be avoided by repeating the measurement of the transmission spectrum.

Andrew G. White, Jeremy L. O’Brien, Geoff J. Pryde +2 more